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63
Res. Rev. J Ecol. Environ. Sci.| Volume 6 | Issue 1 | January - March, 2018
e-ISSN:2347-7830
p-ISSN:2347-7822
Research & Reviews: Journal of Ecology and Environmental Sciences
Air Pollution Sources in Libya
Yasser F Nassar1*, Kaiss R Aissa1 and Samer Y Alsadi2
1Mechanical Engineering Department, Sebha University, Brack, Libya
2Electrical Engineering Department, Palestine Technical University, Kadoorie, Tulkarm, Palestine
Review Article
INTRODUCTION
Air pollution is a concentration of foreign matter in the air that adversely affects the health and welfare of people. Air
pollutants are the liquid, solid, gaseous, radioactive, or microbial chemicals suspended in the air, that are caused by different
Received: 05/11/2017
Accepted: 27/11/2017
Published: 04/12/2017
*For Correspondence
Yasser F Nassar, Faculty of Engineering
and Technology, Mechanical Engineering
Department, Sebha University, Brack, Libya,
Tel: 01223332900.
E-mail: yasser_nassar68@ymail.com
Keywords: Environment, Air pollution, Glob-
al warming, Libya, climate change, GHG
ABSTRACT
This study aims to identify the quantities of hazardous gases emitted
from different sources of air pollution in Libya, attempting to meet the lack of
information, to provide the decision makers with the information and guidelines
related to the environmental situation of the country, to fulll the role assigned
to us to mitigate the global warming and to put the polices and strategies of
the development in line world policies direction. This study presents a frame
work for any steps addressing air pollution abatement. The present research
shows that the annual total air emissions is about 61.1 million tonnes. The
largest share of emissions was for carbon dioxide CO2 (96.76%), followed
by carbon monoxide CO (2.13%), then particulate matters PM (0.55%), then
sulfuric dioxide SO2 (0.21%), nitrogen oxides NOX (0.18%), then methane gas
CH4 (0.089%), voltaic organism component VOC (0.061%) and in the last
ranking was nitrous oxide N2O with (0.028%). The annual total equivalent
carbon dioxide is around 64.6 million tonnes CO2e, which represents about
9.7 ton/year/capita. Accordingly, Libya is ranking 53 from 225 in the list of
countries by emissions of carbon dioxide with a contribution up to 0.22% and
ranking 41 from 225 in the list of countries by emissions of carbon dioxide per
capita. The present research reveals that most pollutants are emitted from
the electricity industry with share of 33.9% followed by the transportation
sector with 30.7% then the residential and commercial sector with 14.2% then
the cement manufacturing industry with 10.9%. It was possible to mitigate
these emissions by using the market available capture technologies. But
unfortunately, they did not, which led to the excessive of harmful emissions
to humans and the already fragile environment. Estimation of quantities of
pollutants in units of mass of pollutant per unit mass of manufacturing product
or fuel consumption, is necessary in order to gure out the socio-economic
effect of the environment damage and to estimate the carbon price or tax of
the industrial activities, similar to the countries which preceded us in this eld.
There is no work considered this topic in Libya and most of the little available
works are in the measurements eld, which measured the concentrations
of the pollutants for comparison purposes with international standards and
it is not possible to nd out the quantities of emissions, due to the lack of
data in these reports (such as productivity, fuel consumption, uent gas ows
through the chimneys, etc...), which makes these measurements in their
present gures useless economically. This presents the novelty of this work.
The present paper paved the way for more detailed survey on the air pollution
sources and to draw the strategies for mitigation in Libya.
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Res. Rev. J Ecol. Environ. Sci.| Volume 6 | Issue 1 | January - March, 2018
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Research & Reviews: Journal of Ecology and Environmental Sciences
human activities related to industry, construction, transportation or natural resources. Such pollutants cause harmful effects to
humans, animals and plants. Air pollution is considered one of the main pollution problems around the world. Most countries
consider this problem a threat to national health and enforce strict regulations, among other solutions, trying to reduce it as
much as possible. The main pollutants found in the air, are from combustion. Carbon Monoxide (CO) is produced by incomplete
combustion of hydrocarbon-based fuels and it enters the bloodstream through the lungs and forms carboxyhemoglobin, which
affects both healthy and ill people. Hydrocarbons (CXHY) are emitted by unburned or partially burned fuel and also when fuel
evaporates directly into the atmosphere. Hydrocarbons include many toxic compounds that cause cancer and other adverse
health effects. They also react with nitrogen oxides (NOX) in the presence of sunlight to form ozone (O3). A very signicant portion
of nitrogen oxides comes from cars in urban areas. These highly reactive gases are colorless and odorless, but they can often
be seen combined with particles in the air as a reddish-brown layer of smog over many urban areas. Because their formation is
aided by high temperatures and excess oxygen, motor vehicles are the primary source of nitrogen oxides. Carbon Dioxide (CO2)
is a product of complete combustion. As a pollution concern, it doesn’t directly impair human health, but it is a greenhouse gas
(GHG) that traps the earth’s heat and contributes to the potential for global warming. Particulate matter (PM) is produced mainly
from cement manufacturing factories, quarrying and oil renery industries. Melting lead and burning solid wastes are other
major sources of air pollution. Libya has ratied the United Nations Framework Convention on Climate Change (UNFCCC), United
Nations Convention to Combat Desertication (UNCCD), signed the Kyoto protocol (1997) and the Paris agreement on climate
change (2015) and created a DNA in 2010. Libya vigorously works toward further international progress in the global warming as
a security issue. Despite this effort there is a crucial lack of data and information on air emissions in general and on mitigation
in particular, as appeared clearly from the Libyan national report which is presented in European Environment Agency in March
2015, where did not set out any indicator for pollution levels in Libya! [1]. Scientists and researchers are suffering from the difcultly
of data collection, because no database exists; signicant difculties are encountered in specic data for end-use sectors. The
main difculties are: Lack of coordination between institutions involved in data collection, data availability, incomplete annual
data set and approximation of unavailable data, conict in available data. The estimation of the quantity of the pollutants in units
of mass of pollutant per unit mass of manufacturing product or fuel consumption, is necessary in order to gure out the socio-
economic effect of the environment damage and to estimate the carbon price or tax of the industrial activities, similar to the
counties which preceded us in this eld. There is no work considered this topic for Libya and most of the little available works are
eld measurements, which measured the concentrations of the pollutants for comparison purposes with another international or
regional standards-even we don’t have our own standards-and it is not possible to nd out the quantities of emissions because
the lack of design data and operation parameters in these reports (such as factory productivity, fuel consumption, uent gas
ows through the chimneys, etc..), which makes these measurements in their present gures useless from socio-economic point
of view.
It is more convenient-in case concentration is available-to formulate the annual pollutants emission in one of the following
expressions:
9
,
10
it i i h d
PE C V N N
ρ
−
= × ×× × ×
(1)
9
,F
10
ii h d
i
C VN N
PE F
ρ
−
× ×× × ×
=
(2)
9
,P
10
ii h d
i
C VN N
PE P
ρ
−
× ×× × ×
=
(3)
Equation (1), presents the annual pollutants in (tons emission/year), equation (2) presents the pollutants per unit of fuel
consumption (tons emissions/ m3 fuel), and equation (3) presents the pollutants per unit of production (tons emission/ton pro-
duction).
Where,
P
Ei,t ,
P
Ei,F and
PE
i,P are the pollutant mass based: on time (tons pollutant/year), unit fuel consumption (tons
pollutant/unit fuel consumption) and unit production (tons pollutant/unit production), respectively,
F
and
P
are the annual fuel
consumption (m3 or ton/year)and the annual production of the factory (m3 or ton/year), respectively, Ci presents the concentration
of the pollutant i (m3 of pollutant/106 m3 of uent gases), pi indicates to the density of the pollutant i (kg/m3), the density of some
pollutants are presented in [2],
V
is the volumetric ow rate of the uent gases (m3/hr), Nℎ and Nd is the regime of work (hours per
a day) and (days pear a year), respectively. The present paper paved the way for more detailed survey on the air pollution sources
and to draw the strategies for the mitigation in Libya. However, the mitigation potential specially in the energy sector is certainly
very high, due to the high potential of renewable energy resources. Major sources of air pollution in Libya include industries,
power sector, residential (domestic sector) and transportation sector. The growth in urban population and extensive development
activities have further added to the increased levels of air pollution in the country.
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Res. Rev. J Ecol. Environ. Sci.| Volume 6 | Issue 1 | January - March, 2018
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Research & Reviews: Journal of Ecology and Environmental Sciences
Country General Context
Libya, located in North Africa between 25 latitude north and 17 longitude east, extends over 1,759,540 km2 with population of
6,653,210 people (July 2017). It is bordered by the Mediterranean Sea to the north, Egypt to the east, Sudan to the southeast,
Chad and Niger to the south and Algeria and Tunisia to the west. Both the Mediterranean Sea and the desert affect Libya's
weather. Figure 1 shows a map of Libya, indicating some important economic cities as well as the geographical location of
Libya in the African continent. The climate is Mediterranean along coast; dry, extreme desert interior, in the winter, the weather
is cold, with some rain on the coast. The Sahara is very dry and hot in the summer and cold and dry in the winter. Libya is an
extensive and a wide-spaced country, the population is distributed along and cross this vast extension, making it difcult for
any planner or executive to deliver services for all, nevertheless, 100% of population has access to drinkable water, electricity
grid and communication facilities, linking the country a large network of paved roads and airports [3]. This situation places a
great deal of pressure on energy demands, food supplies and even the environment by increasing the generation of waste and
residues. Economically, Libya had depended on fossil fuels, petroleum and natural gas for its income energy, industrialization
and development. Although some efforts have been made to diversify the sources of income, to a large extent, fossil fuels have
continued to play a major role in the country's economy [4].
Figure 1. Map of Libya indicating the major sites, those which have economic activities and the geographic location of Libya in the African
continent.
Air Emission Sources
There are two main sources of air pollution in Libya:
1. Natural, such as dust and sandstorms.
2. Anthropogenic activities including stationary sources, such as thermal power generating plants and industrial parks and
mobile sources including vehicles, emissions from various industrial processes.
Natural Air Emission Source
Sand storm
Dust storms are among the most severe environmental problems in certain regions of the World. It has estimated that the
Sahara Desert alone contributes 2 × 108 - 3.3 × 108 tons per year or between 40–66% of the total dust. Dust storms may be
traced as far as 4000 km from their origin. Environmental impacts of dust storms, reported in the literature include reduced
soil fertility and damage to crops, a reduction of solar radiation and in consequence the efciency of solar devices, damage to
telecommunications and mechanical systems, dirt, air pollution, increase of respiratory diseases and so on [5]. On the 16th of
May 2017, a dramatic dust storm moved over Libya which caused a heavy dust load, greatly affected visibility and air quality and
caused a total airport shutdown as well as damage to buildings, vehicles, power poles and trees throughout the center of the
country. This storm was massive enough to be seen clearly from outer space and is considered to be one of the heaviest recorded
dust storms in the last decade as it illustrated in Figure 2.
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Research & Reviews: Journal of Ecology and Environmental Sciences
Figure 2. Dust storm coming from the South -Western part of Libya source EUMETSAT 16/05/2017 at 05:00:00 UTC.
The impact of a dust storm on national and regional economies can't be overestimated. Due to the complexity of how the
dust storms impact various socio-economic sectors in to different extents, few data regarding budgetary losses is available. A
2009 study suggests that increased dust-storms would result in annual losses of 12.7 bio USD in GDP per annum in the MEN
A regional one. Considering that North Africa as a sub-region are more heavily affected by the dust storms than the MENA, the
amount of annual GDP losses must be signicantly higher [6].
• Negative socio-economic impact across all sectors (house hold level, labour productivity, loss of raw materials and
perishable goods, spiking energy expenditures, damages to infrastructures, disruption of supply chains, telecommunications etc.).
• Reduced visibility affects transport: airports, border crossing points, ports remain closed.
• Increased cloud formation increases surface heat and further aggravates drought effects.
• Dust storms damage crops, cause soil loss and remove organic matter and nutrient-rich lightest particles, thereby reducing
agricultural productivity. Large parts of Libya’s fertile soil have already been “blown” away.
• Intensication of desertication, drought and reduction of water supplies (drinking water, irrigation) and signicant
increase in soil salinity.
• Signicant strains on the public health sector. Hospitals are over whelmed in dealing with acute and chronic respiratory
affections caused by SDS.
Anthropogenic Air Emission Sources
The main sources of air pollution in Libya are the electrical power plants, the various means of transportation, the smoke
rising from the chimneys of factories, the heavy dust from quarries, the burning of solid wastes and the effects of water treatment
projects.
Electricity generation
Unfortunately, most of the electricity in Libya is made from polluting, non-renewable sources such as fossil fuel and natural
gas, in spite of the country has high potential of renewable energies. In fact, making electricity is the 1st industrial cause of air
pollution in Libya and it creates more carbon dioxide (CO2) into the air than any other sector. Emissions of Electric power plants
are factors in three major environmental issues: Acid rain, urban air quality and global climate change. Libya electrical generation
is based on 13 power plant stations, most of them are located along the coastal side of Libya, as it is presented in Figure 2.
The total capacity is 8051 MW with the contribution of the steam stations of 20%, while 43% for gas plants and the share of the
combined cycle plants is 37%. The energy produced from Libyan stations comes from combustion of heavy oil (20%), light oil
(40%) and natural gas (40%) (Figure 3). The total electricity generated in 2012 is 33,980 MWh with average efciency of 27%.
Figure 2 shows the location, characteristics of the electricity generation power plants and the electricity consumption by sectors
in Libya. The fossil fuel and natural gas consumption during the year 2012 is presented in following Table 1. The emission factors
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Res. Rev. J Ecol. Environ. Sci.| Volume 6 | Issue 1 | January - March, 2018
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Research & Reviews: Journal of Ecology and Environmental Sciences
for several types of fossil fuel and natural gas that red in the boilers of steam generators or burned in the combustion chambers
of the gas and combined power plants are tabulated in Table 2 [7].
Table 1. Annual fuel consumption in the electrical generation plants (m3/year).
Natural Gas Heavy fuel oil Light fuel oil
6,013,482,065 805,472 2,388,932
Table 2. The emission factor for many types of fossil fuel and natural gas for electric ulity (unit mass emission/m3 red fuel) [7].
i
Air emission j=1 j=2 j=3
Natural gas (gram/m3) Heavy Fuel Oil Electric Utility (kg/m3) Light Fuel Oil Electric Utilities (kg/m3)
1
CO21,900.46 3,155.24 2,752.25
2
CH40.49 0.034 0.18
3
N2O 0.049 0.064 0.031
4
PM 0.04 0.905a 0.24
5
SO20.0096 7.98b 34.6
6
NO22.24 6.6 2.40
7
VOC 0.044 0.034 0.024
8
CO 0.56 0.6 0.6
Note: (a) Heavy Oil, Particles K𝑔/m3=1.25𝑆 + 0.38, (b) Heavy Oil, Sulfur dioxide (K𝑔/m3=19𝑆). S is the sulfur content of the fuel expressed as
a percent (%) by mass, the Libyan Oil contains 0.420% [8]
Figure 3. Locations and statistics of produced energy during the year 2012 according to technology, fuel consumption and the consumption in
Libya [9].
Accordingly, one can calculate the emissions (ton/year) from equation (4). The results are tabulated in Table 3.
( )
,
n
i ij j
ji
PE EF V
=
= ×
∑
(4)
Where
i
PE
is the mass rate emission of type i of pollutant (unit mass per unit time); EFi, is the emission factor emission of
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Res. Rev. J Ecol. Environ. Sci.| Volume 6 | Issue 1 | January - March, 2018
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Research & Reviews: Journal of Ecology and Environmental Sciences
pollutant i for the fuel type j (unit mass of pollutant per unit mass or volume of fuel);
j
V
is the ow rate of the fuel type j (unit mass
or volume per unit time) and n is the number of types of combustion fuel.
The total air emissions are calculated as:
1
m
i
i
PE PE
=
=
∑
(5)
Where,
PE
is the total air emissions for n number of pollutants (unit mass per unit time) and
M
is the number of pollutants
that are under consideration. The equivalent dioxide carbon eCO2 is calculated according to the following equation [10].
22 4 2
25 298
eCO CO CH N O
PE PE PE PE= +× + ×
(6)
Table 3. Annual pollutants emitted from the electricity generation industry corresponding to the red fuel in (tons/year).
i
Air emission j=1 j=2 j=3
Natural gas Heavy Fuel Oil Light Fuel Oil Total(ton/year)
1
CO21.1428E07 2.5415E06 6.5749E06 2.054440E07
2
CH42.9466E03 2.7386E01 4.3001E02 3.403996E03
3
N2O 2.9466E02 5.155E01 7.4057E01 4.202670E02
4
PM 2.4054E02 7.2895E02 5.7334E02 1.542830E03
5
SO25.7729E00 6.4277E03 8.2657E04 8.909047E04
6
NO2
1.347E04
5.3161E03 5.7334E03 2.451950E04
7
VOC 2.6459E02 2.7386E01 5.7334E01 3.493100E02
8
CO 3.6081E03 4.8328E02 1.4334E03 5.524780E03
Total emissions
2.0669251E07
Total emissions of eCO2
2.0755E07
Cement industry
Cement is indispensable for building and construction work and cement industry is considered to be an important
infrastructure core industry. It is one of the most advanced industries of Libya. Libya at the present time has eight factories for
cement production with total productivity 7.5 million ton per year. The cement industry can play a signicant role in the overall
economic growth. As with many other industries, greenhouse gases are produced directly from the burning of fossil fuel sand
indirectly from the generation of electricity used. In addition, the cement production process itself releases carbon dioxide when the
calcium carbonate in limestone is converted to calcium oxide during the production of clinker in the kiln. As this chemical reaction
is an essential step in the cement production process, cement manufacture emits relatively greater volumes of greenhouse gases
than other industrial processes. The manufacture of cement involves heating these materials to high temperatures (typically 1400
-1500°C) for long periods to produce clinker, which is then ground with gypsum to produce cement. Cement manufacturing is a
capital intensive and energy intensive process, relying on heavy fuel oil and gas as primary sources of thermal energy. Generally,
NOX emissions are generated during fuel combustion by oxidation of chemically-bound nitrogen in the fuel and by thermal xation
of nitrogen in the combustion air. The amount of thermally generated NOx increases as ame temperature increases. Emissions
of SO2 are generated from sulfur compounds in the raw materials and, to a lesser extent, from sulfur in the fuel. Okasha et al.
had conducted an extensive study regarding the air emissions from cement factories in the north- west Libya and reported their
investigation by Okasha A [11]. Unfortunately, many other cement manufactories, especially in eastern side left unstudied. The
results of these manufactories was performed by analogy between those of fuel type of the studied factories. Accordingly, the air
pollutants in ton per year has been calculated and tabulated in Table 4.
Table 4. List of the cement manufactories, productivity (M ton/year) and the amount of air emission (ton/year).
Cement plant Productivity Mton/year Fuel type Air pollutants ton/year
NOXSO2CO2Dust
Lebda [11]
1
N.G
1,495.8
827.52 752,796 71,535
Mergheb [10] 0.3 N.G 698.8 210.94 701,730 9,814
Zleten [12]
1
N.G
1,347.4
230.52 785,420 40,163
Souk alkhamies
1
N.G 1,036 279.2 752,796 34,200
Alhouary
1
H.F.O 913 80.1 793,409 34,200
Benghazi 0.8 H.F.O 730 64.1 634,728 27,360
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Alfataeh
1
H.F.O 913 80.1 793,409 34,200
Alborj [12] 1.4 H.F.O
1,332.4
112.2 1,158,900 10.395*
Total 7.5
8,466.4
1,884.68 6,373,188
251,482.4
Total emissions (ton/year)
6,635,000
Total emissions of eCO2 (ton/year)
6,373,188
Note: *There are electrostatic precipitator and lters
Agriculture and livestock sector
Libya is deeply dependent on imports for domestic food demand. Climatic conditions and poor soils limit farm domestic food
production. Domestic conditions limit output, while income and population growth have increased food consumption. Compared
to its North African neighbours, the agriculture sector contribution to the country’s Gross Domestic Product (GDP) in Libya is a
lot lower and has been declining ever since oil discovery in 1958, the situation gets worst as the county plunged into civil war
since 2011 the agriculture productions declined by -6.7% with GDP=1.9 in 2016 [12].The contribution of the sector in the GDP is
less and less important. The agriculture sector is quite difcult to analyze and no data on energy consumption is available. Many
information and surveys are needed to identify the air emission from this sector In contrast, for livestock it is less complicated so
that they can inventory types and counting the animals in the country as well as the emission factors of every kind, therefore
the emissions can be estimated from the livestock. The main sources of emissions are: feed production and processing (45% of
the total), outputs of GHG during digestion by cows (39%) and manure decomposition (10%). The remainder is attributable to the
processing and transportation of animal products. To arrive at its estimates, FAO conducted a detailed analysis of GHG emissions
at multiple stages of various livestock supply chains, including the production and transport of animal feed, on-farm energy use,
emissions from animal digestion and manure decay, as well as post-slaughter transport, refrigeration and packaging of animal
products (Table 5). About 44% of livestock emissions are in the form of methane (CH4). The remaining part is almost equally
shared between Nitrous Dioxide (N2O, 29%) and Carbon Dioxide (CO2, 27%) [13,14]. The emission factors have been taken from and
the number of livestock in Libya from [15,16].
The emissions (ton/year) has been calculated using equaon (7). The results are tabulated in Table 4.
( )
5
,
1
i ij j
j
PE EF N
=
= ×
∑
(7)
Where,
P
Ei : is the mass rate emission of type i of pollutant (unit mass per unit time); EFij : is the emission factor for type i
of pollutant for animals type j (unit mass of pollutant per unit time per hoof); Nj : is the number of animals of type j (hoof) the total
air emissions.
Table 5. Methane CH4, nitrous oxide N2O, carbon dioxide CO2 and equivalent CO2e emissions from domestic livestock fermentation.
i
Animals type j=1 j=2 j=3 j=4 j=5 Total
Sheep Goats Camels Cattle Horses&
donkeys
Number of animals (hoof) 3,987,651 1,080,420 109,397 102,506 11,399 5,291,373
1
Emissions CO2 (ton/year) 5,916 1,605 1,494 1,401 63 10,479
2
Emission CH4 (ton/year) 9,641 2,613 2,434 25,652 100 40,430
3
Emission N2O (ton/year) 6,355 1,722 1,604 1,503 66 11,250
Total emissions (ton/year) 62,159
Total emissions of eCO2 (ton/year) 4,373,800
Solid waste generation
Classications of solid wastes are proposed here according to the origin wastes: municipal solid waste (MSW), industrial solid
waste (ISW) and healthcare solid waste (HSW). According to The weight of garbage resulting from the people in Lybia is ranging
between 0.35-2.00 kg/day with average of 0.78 kg of waste per capita daily; however, waste production rates and composition
vary widely depending on the region [17]. Accordingly, the amount of waste from all Libya householders 1,894,200tons/year, these
wastes contain from: organic matter represents 59% of waste, followed by paper–cardboard 12%, plastic 8%, miscellaneous 8%,
metals 7%, glass 4% and wood 2%. The overall generation of ISW, including non-hazardous wastes, industrial wastes, demolition
and construction, is 1,248,000 tons/year. The hazardous waste generated is 106,200 tons/ year; HSW reaches 87,000 tons/
year. The quantity of MSW generated in Libya is estimated at 3.3354 million tons/year, this quantity is quite biger than what
Tarek et al. provided in which was 3.2 Mton/year [18]. The increase in solid waste production has been attributed to the population
growth, the expansion of trade and the increased number of industries in Libya. Elimination is the solution applied to 97% of
waste produced in Libya. These wastes are either thrown in to open dumps (67%) or burned in the open air in either public
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dumps or municipal, uncontrolled dump (30%) [19]. Quantities destined for recovery are quite low: only 1% for recycling and 2%
for composting [20]. According to author’s observation and in the absence of the municipal purgation workers and the Ministry of
environment, 100% of waste is burned in the uncontrolled dumps and in some times in urban zones causing black dark cloud over
the zone and unbearable smells, for this reason, we have adopted a value of 70% for the burned waste. Wiedinmyer and etc. in
provided a long list of the emission factors of pollutants emitted from the burning of waste, the list contained GHGs, reactive trace
gases, particulate matter and toxic compounds [21]. The IPCC suggests only 60% of the total waste available to be burned (70% of
MSW generated) that is actually burned. So the mass of air pollutants will be the yield of the product of the emission factor by the
MSW by 60% by 70%. The results were tabulated in Table 6.
The emissions (ton/year) has been calculated using equation (8). The results are tabulated in Table 6.
0.60 0.70
ii
PE EF M= ×× ×
(8)
Where:
P
Ei: is the rate of the type i of pollutant (unit mass per unit time); EFi: is the emission factor for type i of pollutant
(unit mass of pollutant per unit mass of burned waste); and
M
: is the mass rate of the waste (unit mass per unit time).
Table 6. Emission factors (kg /ton waste burned) for species emitted from the burning of waste.
i
Compound Emission factor kg /ton waste burned Air pollutants ton/year
1
Carbon dioxide (CO2) 1,453 2,035,500
2
Methane (CH4) 3.7 5,183.2
3
Carbon monoxide (CO) 38 53,233
4
Sulfur dioxide (SO2) 0.5 700.43
5
Nitrogen oxides (NOX) 3.74 5,233.3
6
PM2.5 9.8 13,729
7
PM10 11.9 16,670
Total emissions (ton/year) 2,130,200
Total emissions of eCO2 (ton/year) 2,165,100
Transportation
Libya is an extensive and wide spaced country the population is distributed along and cross this vast extension. There are
about 83,200 km of roads in Libya, 47,590 km of which are surfaced [22]. Lack of efcient public transport system in most of
cities and growing travel demands has fueled the growth of private vehicles in the country and correspondingly, increased the
air pollution and is also blamed for contributing of climate change and global warming. The number of motor vehicles rose from
465,000 vehicles in 1983 to 2,680,000 in 2014. Where 2,500,000 vehicles are gasoline-fueled passenger cars and 180,000
are diesel-fueled trucks. Passenger vehicles are dened as 2-axle 4-tire vehicles, including passenger cars, vans, pickup trucks
and sport/utility vehicles. The calculations for Total Annual Pollution Emitted and Fuel Consumed are based on average annual
passenger car kilometers travelled of 19,000 km per year and an average annual light-medium truck kilometers of 24,000 km.
In 2015 and according to (FHWA 2017), fuel consumption is based on eet wide average in-use fuel economy of 10.25 km per
liter for passenger cars and 7.355kmper liter for light trucks [23]. According to Libya has eight registered air carrier companies
with 23 aircrafts, carrying 2,566,465 passengers per year around the country and cross the word wide, travelling a distance of
3,833,542,000 km pear year. And there are 146 airports serve the country, 68 airports with paved runways and the rest are
unpaved. Also Libya has a modest eet of merchant marine consists of: 8 cargos, 4 chemical tankers, 3 liqueed gas tanker, 7
petroleum tankers, 4 passengers and one roll on/roll off. The emission factors are tabulated for many types of vehicles, trucks,
aircrafts and waterborne crafts in [24-26]. As it’s indicating in Table 7 the unit of the emission factors are gram pollutant per km
driven or travelled, so the annual air emissions will be the product of the emission factor by the annual kilometers driven by vehicle
by the number of vehicles and the annual fuel consumption will be the product of the fuel consumption rates in liter per km driven
by the annual kilometers driven by vehicle by the number of vehicles. The obtained results are tabulated in Table 7.
( )
4
,
1
i ij j
j
PE EF K
=
= ×
∑
(9)
Where,
i
PE
is the mass rate emission of type i of pollutant (unit mass per unit time); EFi,j: is the emission
factor emission of pollutant i for the transportation type j (unit mass of pollutant per km driven or travelled); and
Kj
: is the annual kilometers driven or travelled by transportation type i (unit length per unit time). Then the total air emissions
j
K
E is:
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8
1
i
i
PE PE
=
=
∑
(10)
Table 7. Estimated emission and fuel consumption factors for gasoline-fueled passenger cars, diesel-fueled trucks, aircrafts and waterborne
craft.
i
Pollutant/fuel
Fuel Consumption Rates (litre per km driven)
Annual
Emission
per year)
j=1
j=2
j=3
j=4
Gasoline fuelled
Passenger cars
Diesel-fuelled
trucks
Aircraft
Waterborne
Craft*
1 CO2
229 1,312.90
442.6
676
1.82E07
2 CH40.04
0.003169 0.014645 0.0025
1.97E03
3 N2O 0.091 0.0029826
0.014001
0.01678 4.39E03
4 CO 6.2 8.463 n/a†
7.92
3.31E05
5 NOX0.52
6.8052 n/a
3.024 5.41E04
6VOC 0.67 0.13089
n/a 0.3384
3.24E04
7 PM
0.0053
0.13102
n/a
n/a 8.18E02
8 SO20.01004 0.39307
n/a
n/a 2.18E03
Fuel cons. (l/km)
0.0976
0.13597
0.068212
0.1411 3
Annual fuel cons. (l/year)
4.636E09
5.88.E08 2.62 E08 n/a
Total emissions (ton/year) 1.8732 E07
Total emissions of eCO2 (ton/year) 1.9603 E07
Crude oil renery industry
According to EIA and Citac, Libya has ve domestic reneries, with a combined name plate capacity of approximately 380,000
bbl/d (51,351 ton/day), signicantly higher than the volume of domestic oil consumption (227,000 bbl/d; the rest is exported).
Libya's reneries include:
• Ras Lanuf export renery, completed in 1984 and located on the Gulf of Sirte, with a crude oil rening capacity of 220,000 bbl/d.
• Az Zawiya renery, completed in 1974 and located in north-western Libya, with crude processing capacity of 120,000 bbl/d.
• Tobruk renery, with crude capacity of 20,000 bbl/d.
• Brega, the oldest renery in Libya, located near Tobruk with crude capacity of 10,000 bbl/d.
• Sarir, a topping facility with 10,000 bbl/d of capacity.
The plants are unsophisticated and consume a lot of energy. They are not capable of producing products that correspond
to the specications required by the consuming countries such as unleaded petrol, reformulated gasoline and low Sulphur gas oil
(Figure 4). The reneries suffered very badly from the technological and equipment limitations imposed by sanctions. Reneries
are a potential source of atmospheric emissions of carbon dioxide (CO2), carbon monoxide (CO), methane (CH4), Volatile Organic
Compounds (VOCs) including hazardous substances such as benzene and 1,3-butadiene, Sulphur, reduced Sulphur compounds
and oxides of Sulphur, ammonia, oxides of nitrogen, toxic organic micro pollutants (dioxins, PAHs), heavy metals, particulates and
odour [27].
Figure 4. Libyan map indicating the oil activities.
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The most signicant air emissions sources in oil reneries are catalytic or thermal cracking units, catalytic reformer units,
sulfur recovery plants, storage vessels, uid coking units wastewater streams, cooling towers, equipment leaks, blow down
systems, vacuum distillation units, steam boilers, process furnaces, process heaters, compressor engines, barge or ship loading
and gasoline loading racks specically located at petroleum reneries (Table 8). It identies the air pollutants from these air
emissions sources and summarizes US EPA publication AP-42 estimates of the uncontrolled emissions from these oil renery air
emissions sources.
Table 8. Emission factors and the air emissions from crude oil renery industry.
Pollutants Emission factor kg/1,000 bbl crude oil
Emissions
ton/year
Carbon dioxide 8,057 1,117,400
Methane 15.59 2,163
Nitrous oxide 0.2543 35.3
Particulates 347 48,129
Carbon Monoxide 6215 862,020
Sulfur Dioxide 224 31,069
Nitrogen Oxides 33 4,577
Hydrocarbons 398 55,203
Aldehydes 8.7 1,207
Ammonia 24.5 3,398
Inorganic Chlorine 4,450 617,220
VOC 2.12 294
Total emissions (ton/year) 2,742,715
Total emissions of eCO2 (ton/year) 1,182,000
Petrochemical industry
Natural gas and crude distillates such as naphtha (from petroleum rening) are used as feedstock to manufacture a wide
variety of petrochemicals which are in turn used for the manufacture of a variety of consumer goods. The basic petrochemicals
manufactured by cracking, reforming and other processes include olens (including ethylene, propylene, butylenes and butadiene)
and aromatics (including benzene, toluene and xyleme). Libya has a total of eight petrochemical manufacturing facilities [28]. Marsa
El-Brega: It came on stream in 1978 and produces primarily methanol and fertilizers and consists of: Two methanol units that
produce 720,000 tons per year (tpy), two urea units with a total capacity of 900,000 (tpy) and two ammonia units with a capacity
of 700,000 tpy [29]. Ras Lanouf: Located on the Mediterranean Coast and operated by the Libyan National Oil Corporation (NOC)
is Libya's biggest. It came on stream in 1987. It produces petrochemicals utilizing naphtha as a feed stock to an ethylene plant
with a capacity of 12,450kiloton per year (ktpy). Its main products are ethylene (330 ktpy), high density polyethylene (HDPE) (80
ktpy), linear low density polyethylene (LLDPE) (80 ktpy), polypropylene (170 ktpy) and butadiene (585 ktpy) [30]. Abu Kammash: It
came on stream in the 1970. Abu Kammash complex produces polyvinyl chloride (PVC) (104 ktpy), vinyl chloride monomer (VCM)
(60 ktpy), vinyl chloride (60 ktpy), sodium hydroxide (50 ktpy) and chloral (45 ktpy). A large portion of its output is exported [31].
Unfortunately, there is no any information regarding to the air pollutions is available.
Iron and steel industry
Steel will remain the basis for economic development in the world. It is used to produce everything from sewing needles
and tools to automobiles, ships and planes. The main types of plants involved in iron and steel industry are sintering plants, blast
furnaces and steel works, direct reduction plants, ferroalloy production, rolling, scarng, pickling, iron and steel foundry and other
technologies, such as argon-oxygen decarburization, ladle metallurgy vacuum degassing. Coking plants are considered here
as part of this sector, since coke is produced practically exclusively for the iron and steel industry. The iron and steel industry
causes signicant effects on environmental media: air-emissions of SO2, NOX, CO, H2S, PM, lead, Ni, As, Cd, Cr, Cu, Zn, Se,
Hg, PM, etc.; water-process water with organic matter, oil, metals, suspended solids, benzene, phenol, acids, suldes, sulfates,
ammonia, cyanides, thiocyanates, thiosulfates, uorides(scrubber efuent); soil-slag, sludge, sulfur compounds, heavy metals, oil
and grease residues, salts [32].
The Libyan Iron and Steel Company (LISCO) is one of the largest companies in North Africa with an annual design capacity of
1,324,000 tonnes of liquid steel adopting direct reduction/electric arc furnace method utilizing natural gas as reductant of high
quality pellets to produce sponge iron and hot briquetted iron. LISCO is located near the coastal city of Misurata, (About 210 km
East of Tripoli). LISCO Plants consists of a direct reduction plant, two steel melt shops, a three-line bar and rod mill, a light and
medium section mill, a hot strip mill and a cold strip mill with a galvanizing line and a coating line. The calcining plant is designed
to produce 66,000 tons annually of burnt lime and 22,750 tons annually of dolomite. The plant contains two vertical furnaces for
producing burnt lime, one rotary kiln to produce burnt dolomite (Table 9). If we know that to produce one ton of iron products, we
need to burn about 460 cubic meters of natural gas, about 59 kg of oil and about 1400 kWh, as consumption of electricity [33].
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Table 9. Emission factors and the air emissions from iron and steel industry.
Pollutants Emission factor kg/ton iron Emissios
ton/year
Carbon dioxide 1,069.8 1,390,800
Particulates 0.868 1,128.4
Carbon Monoxide 3.7811 4,915.4
Sulfur Dioxide 3.5285 4,587
Nitrogen Oxides 6.2811 8,165.4
Total emissions (ton/year) 1,409,596
Total emissions of eCO2 (ton/year) 1,390,800
Industries
The industrial sector is one of the most dynamic sectors of the economy and plays an essential role in economic development. The
Libyan government privatized the small industrial sector early in the beginning of 1990s, consequently, measurement execution is
not possible. Regardless most of private industrial activities are registered in the Libyan Industry Union, but there is no sufcient
information about the activities of these factories, indeed some of them are manufacturing factories and most of them are just
packing factories. For this reason, we recommended at the end of this work, all the private industrial activities have to submit an
environmental report at the end of the year, including energy consumption, amount of emissions whether gas, liquid or solid. This
report should be evaluated by a specialized committee, similar to the nancial report that provides taxes periodically. Therefore, we
have applied the carbon pricing or taxes to every product based on internationally standard environmental restrictions. However,
heat is required in most industrial processes. The sources of gas emissions issued by the chimneys factory are caused by burning
fossil-fuel in factories. In small factories, electricity can be used as a source of the thermal energy. However, in large factories,
fossil- fuel or natural gas are burned in ovens, burners or boilers to provide the thermal energy to the plant. However, unfortunately
there are no information about the number of factories, their activities and how to provide them for thermal energy. According to
what stated in the bulletin of the Libyan Industry Union, there are two factories for soap and powder detergent manufacturing.
ALKALA located in Tripoli with an annual capacity of 18,000 tonnes, ALNIER located in Misturata with an annual capacity of 9,200
tonnes. Using the manufacturing data provided by Ali Af, and we get the emission factors for the soap industry [34]. Introducing the
emission factor for soap industry and the amount of air emissions from these two factories in Table 10.
Table 10. Emission factors and the air emissions from soap and powder detergent manufacturing.
i
Pollutants Emission factor kg/ ton production
Emissions
ton/year
1
CO2138.14 3,757.4
2
CO 0.013503 0.36728
3
SO20.040809 1.110
4
NO20.38497 10.471
5
H2S 0.010587 0.28797
Total emissions (ton/year) 3,770
Total emissions of eCO2 (ton/year) 3,757.4
Residential and commercial sector
During the last 7 years (2011-2017), the residential sector became a source of pollution, especially after the inability of
the General Electrical Company of Libya (GECL) to provide the people a sustainable electrical energy, so it led to massive use of
mobile electricity generators to meet their decit need of electricity, in addition to the use of natural gas in the food-cooking. Due
to the abnormal circumstances of (2011-2017), GECOL faced a shortage in the energy production process, which led to 1200 MW
load shedding (20% of total peak load) for 33 days electricity cut-off in the year 2015 (792 hr/year). In the absence of sufcient
information about the number of generators that are operating in the time of electrical power cut-off, however, the house holders
prefer to buy generators running on diesel, while the owners of shops prefer gasoline-fueled generators! The efciency of these
generators is about 60%.
In Figure 3 the residential sector consumes 36% of the total energy generated, assuming that 50% fraction of the house
load will be provided by a generator and about 70% of the house holders have generators, so about 1,014.4 MW (2,892.3 TJ/year)
will be generated by diesel-fueled generators. And 14% of the base load will be carried over by Gasoline generators also with 50%
fraction load cover, it means that 563.57 MW (1,606.9 TJ/year) will be covered by gasoline generators [35].
The annual fuel consumption (m3/year) of the gasoline G and diesel D fuel are calculated from the following equations (11):
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( )
( )
( )
6
3
3
2,892.3 10 /
//
D
Diesel
MJ year
V m year HHV MJ m
η
×
=×
(11)
( )
( )
( )
6
3
3
1, 606.9 10 /
//
G
Gasoline
MJ year
V m year HHV MJ m
η
×
=×
Where D and G are the annual fuel consumption for diesel and gasoline generators respectively, η is the efciency of the
generator, HHV is the higher heating or caloric value of the fuel. The other source of domestic pollutants is liqueed petroleum
gas (LPG which used for cooking purposes, Libya consumes about 2.7336 million tonnes of gas per year, which equivalent to
5.3843 million m3 per year [36]. The emission factors for gasoline, diesel fuels and LPG are documented in [37,38] and tabulated in
Table 11. The total emissions by the residential and commercial sector will be found from equation (12) and the results tabulated
in Table 11.
( )
3
,i ij j
j
PE MF V= ×
∑
(12)
Table 11. The emission factor for gasoline and diesel-fueled electricity generators.
i
Pollutants
Emission factors (kg/m3 fuel or gas) Emission via
generators (ton/
year)
Emissions
via LPG
(ton/year) Total emissions (ton/year)
j=1 j=2 j=3
Gasoline Diesel LPG
1
CO22322.1 2689.63 1,500 5.1625E05 8.0765E06 8,592,750
2
CH40.1004 0.133 0.024 24.386 129.22 154
3
N2O 0.02114 0.4 0.108 51.102 581.50 633
4
PM 0.1623 0.9628 0.084 131.830 452.28 584
5
SO20.10286 2.8884 0.005 365.070 26.922 392
6
NO21.628 12.516 1.56 1,675.50 8,399.5 10,075
7
VOC 38.628 0.9628 0.12 3,178.1 646.12 3,824
8
CO 223.18 7.7024 0.9 18,626 4,845.9 23,472
fuel cons. m3 /year 79,194 123,570 5,384,300
Total emissions (ton/year)
8,631,883
Total emissions of eCO2 (ton/year)
8,785,106
Note: Gasoline HHV=33,818 MJ/m3, Diesel HHV=39,010 MJ/m3 and LPG (propane) HHV=101 MJ/m3 Gasoline HHV=44.8MJ/kg, LHV=42.9 MJ/
kg, Diesel HHV=47.3 MJ/kg, LHV=43.0 MJ/kg and LPG (propane) HHV=50,350 kJ/kg , Gasoline density=740 kg/m3, Diesel density=830 kg/m3
and LPG density=507.7 kg/m3
RESULTS AND DISCUSSION
The obtained results are presented statistically and plotted by bar and pie charts in Figures 5-14 showing the amount of
pollutants emitted from each sector and also the share of each sector of total pollutants. It is evident from Figure 5 that, the
electrical power industry emits 20.55 million tonnes annually, which presents 35.3% of the total CO2 emissions in the country.
Followed by the transportation sector with 19.6 million tonnes per year, which presents about 31.3% of the total CO2 emissions. The
residential sector comes in third place with 8.8 million tonnes per year which is equivalents to 14.8% of the total CO2 emissions.
With the same rates of participation for almost all sectors in GHG gases, which are graphically represented by CO2e, as it appears
from Figure 6. While the oil rening sector accounted for 67.3% of the total CO emissions, followed by the transportation sector
with 25.9% and all other sectors contributing 6.8%, as it’s presented in Figure 7. However, the situation was different for NOX
emissions, the transportation sector topped the list with share of47% followed by electricity sector with 21.3% the residential
sector share was 8.8% and the rest of the sectors contributed with 23%, as it’s indicated in Figure 8. It refer to the increasing
share of the livestock in the emissions of CH4 and N2O gases, where the emissions exceeded the annual amount of 40 and 11
thousands of tonnes respectively Figures 9 and 10. It is known that the green house effects of CH4 and N2O are 25 and 298
times than CO2. Therefore, this quantity can't be underestimated, for this reason, its effect is signicant in total CO2e, where the
contribution of livestock was approximately 7% of the total GHG emissions, as it evidentially from Figure 6. Figure 11 presents
the amounts Particulate Matters (PM) in tonnes per year that are emitted by sectors and the share of each sector in total PM
emission. The cement industry topped the list with 252 thousand tonnes per year which present about 83% of the total PM
emitted. Although the use of lters and electrostatic precipitators is very efciently to capture most of these PM-as it’s evident
from Table 4. But, unfortunately, it is not used in most factories. Figure 12 presented the amount of Volatile Organic Compound
(VOC). As it’s expected, those sectors that used Gasoline as a red fuel were on top of the list, these sectors are the transportation
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and residential & commercial sectors, by using the gasoline fuelled passenger cars and the gasoline fuelled electricity generators,
are responsibility of about 88% and 11% respectively of total VOC emissions. In the end two are also created, these are: the total
pollutants emitted from all sectors presented in Figure 13. Of course the largest share was for CO2 with 58 million tonnes per
year which is a 96% of the total emissions in the country [39]. Also the contribution of each sector in the air emissions (ton/year)
and the arrow of each sector in percentage are presented in Figure 14.
Figure 5. The annual CO2 (ton/year) emitted by sectors and the share of each sector in total CO2 emission.
Figure 6. The annual GHGs (ton/year) emitted by sectors and the share of each sector in total GHGs emissions.
Figure 7. The annual CO (ton/year) emitted by sectors and the share of each sector in total CO emission.
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Figure 8. The annual NOX (ton/year) emitted by sectors and the share of each sector in total NOX emission.
Figure 9. The annual CH4 (ton/year) emitted by sectors and the share of each sector in total CH4 emission.
Figure 10. The annual N2O (ton/year) emitted by sectors and the share of each sector in total N2O emission.
Figure 11. The annual PM (ton/year) emitted by sectors and the share of each sector in total PM emission.
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Figure 12. The annual VOC (ton/year) emitted by sectors and the share of each sector in total VOC.
Figure 13. The annual pollutants (ton/year) emitted by all sectors and the percentage of contribution of each pollutant in the total emissions.
Figure 14. The contribution of each sector in the air emissions (ton/year) and the arrow of each sector in percentage.
CONCLUSION
The pollutants released from the air emissions sources in Libya has been estimated according to eld measurements in some
sectors and from published or unpublished reports for other activities and unfortunately some industrial activities are left without
evaluation due to the lack of necessary data for the environmental evaluation process. The study reveals that most factories can't
quantify the toxic gases emissions because there are no measuring and controlling devices in their industrial units. Libya ranks 53
from 225 in the list of countries by emissions of carbon dioxide with contribution of up to 0.22% and ranks 41 from 225 in the list
of countries by emissions of carbon dioxide per capita. The annual total air emissions are around 61.1 million tonnes. The largest
share was for carbon dioxide CO2 (96.76%), followed by carbon monoxide CO (2.13%), then particulate matters PM (0.55%), then
sulfuric dioxide SO2 (0.21%), nitrogen oxides NOX (0.18%), then methane gas CH4 (0.089%), voltaic organism component VOC
(0.061%) and in the last position was nitrous oxide N2O with (0.028%). The annual total equivalent carbon dioxide is around 64.6
million tonnes CO2e, which represents about 9.7 ton/year/capita. The main uncertainty results from the incomplete available data.
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It is mainly due to a lack of information provided by private industrial establishment. Conict of information even when the same
researcher, which reduces the condence of some information. Therefore, the environment in Libya requires a more thoughtful
and comprehensive policy of planning, awareness and conservation. In general, these environmental problems have multiplied,
causing socio-economic problems and increasing health hazards. Observing the situation of air pollution in Libya will lead to the
conclusion that many factors needed to solve this problem are absent. For instance, there is no comprehensive national plan
to tackle various environmental problems, including air pollution problems; no control against exceeding the permitted levels
of pollutants, even from ministry of electricity or the environmental authority; no observation or testing centres responsible for
licensing vehicles; no measuring station for air pollution in urban areas and city centres; no follow- up for open air burning garbage
and waste; an absence of specialized teams in air pollution; and a scarcity of specialists, leading to a scarcity of studies and real
facts about air pollution.
RECOMMENDATIONS
The alarm bells are ringing, alerting us to the danger of air pollution. We should start addressing this problem immediately
by activating environmental authorities to create a comprehensive plan to study air pollution problems and their solutions.
Authors suggest these recommendations in this context:
• Increasing awareness and educational programs in the area of energy conservation, environment protection and health
risks resulting from environmental pollution, at all levels of education and in all means of social communication.
• Non-prot societies and associations could combine their efforts to solve this problem by establishing teams to help
with environmental awareness and encouraging people to use environmentally friendly equipment and transportation, reactivate
public buses or other mass transit. Set up a large indicator sets covering most sustainable development issues and providing
detailed insights.
• Improve data collection from the surveys include information on monetary expenditures and physical quantities, includ-
ing fuels and electricity, as well as information of other socio-economic, demographic and infrastructural data.
• The private industrial activities have to submit an environmental report at the end of the year, including energy con-
sumption, amount of emissions whether gas, liquid or solid. This report should be evaluated by a specialized committee, similar
to the nancial report that provides taxes periodically. Therefore, we can apply the carbon pricing or taxes to every product based
on internationally standard environmental restrictions.
• Reactivate and give the power to the censor division in the environmental authority to conduct its work regulatory on
the environment.
• Encourage researches in the eld of renewable energy resources and increase support to the research institutions in
the area of clean energy and environmental issues.
• For decision making purposes, less complex frameworks with small sets of a few lead indicators and recommendations.
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