Pallavi Saxena

Pallavi Saxena
University of Delhi | DU · Department of Environmental Sciences Hindu College

Doctor of Philosophy

About

69
Publications
28,592
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,131
Citations
Introduction
Atmospheric Sciences Expert. Working on trace gases and aerosol chemistry, source apportionment studies, ground-based and satellite data of air pollutants over IGP and Northern India. Exposure based and metrics based studies of trace gases on crops and other plant species.
Additional affiliations
August 2014 - July 2017
Jawaharlal Nehru University
Position
  • Researcher
Description
  • Handled Independent Research Project on "Addressing the Problem of Fog and its Dispersal by Cost Effective Methods in Delhi" as Principal Investigator. Analyzed carbonaceous aerosols, ions in fog water and its dispersal by thermokinetic and phytoremediation methods.
December 2013 - August 2014
Physical Research Laboratory
Position
  • PostDoc Position
Description
  • Worked on Non Methane Hydrocarbons in the ambient air of Western India by using PTR-TOF-MS.
Education
January 2008 - August 2012
University of Delhi
Field of study
  • Photochemical Air Pollutants and their Impact on Plant Health
January 2006 - December 2007
University of Delhi
Field of study
  • Tropospheric Ozone and its Precursors in Ambient Atmosphere of Delhi

Publications

Publications (69)
Chapter
Full-text available
Air pollution and its impact on human health is a very mysterical problem in Indian sub-continent (Badarinath et al., 2006; Pradhan, 2001; Sonwani and Kulshrestha, 2016). Past air pollution related Indian studies have reported peak concentrations of aerosols (Escuin et al., 2008; Murphy et al., 2008; Singh et al., 2009, 2015; Sandhu et al., 2018),...
Article
Full-text available
Objective: This study focuses on the profile of ambient particulate polycyclic aromatic hydrocarbons (PAHs), their seasonal distribution, source identification and human health risk assessment due to inhalation exposure of ambient PAHs in Delhi, India.Materials and Methods: Two sampling sites were chosen, one at roadway (MH) and other at urban back...
Article
Full-text available
This collaborative article discusses the opportunities and challenges of adopting integrated, coordinated, open, and networked (ICON) principles in atmospheric sciences. From the global nature of the atmosphere, there has always been a need for atmospheric science to be an ICON science. With the help of evolving technology, it is possible to go fur...
Article
Full-text available
Recurrent and large forest fires negatively impact ecosystem, air quality, and human health. Moderate Resolution Imaging Spectroradiometer fire product is used to identify forest fires over central India domain, an extremely fire prone region. The study finds that from 2001 to 2020, ∼70% of yearly forest fires over the region occurred during March...
Chapter
Full-text available
The impacts of dust storms that originated over the north-western parts of India, are therefore very common in the northern part of India, in particular, Delhi. Dust storms affect the daily lives of people and also report severe health impacts. The air quality is badly influenced by dust storms events and ultimately creates a big threat to the surr...
Article
Full-text available
The carbonaceous content of rainwater was investigated in samples collected at an urban background site in northern India. Sampling was performed on an event basis during two seasons: pre-monsoon (PM) and monsoon (MN) season covering May–June and July–August, respectively, in 2016. The concentrations of different fractions of water-insoluble organi...
Article
Full-text available
Present study aims to evaluate the tolerance and sensitivity of some selected common ornamental plants like Dracaena deremensis, Tagetes erecta and Dianthus caryophyllus by the Air Pollution Tolerance Index (APTI) at selected sites in an urban metropolis of Northern India, Delhi city. Air pollutant concentrations were monitored at Site I (nearby tr...
Article
Full-text available
Nanoparticles (NPs) are receiving an increasing attention from many scientific communities due to their strong influence on human health. NPs are an important marker of air pollution caused by a variety of natural and anthropogenic sources. Due to their ultrafine size, they can be suspended in the atmosphere for a long time and can thus travel larg...
Chapter
Full-text available
Biomass burning occurred during Rabi and Kharif season contributes huge emission of gaseous pollutants and particulate matter in the atmosphere which deteriorate the air quality in almost all regions of the world. Crop residue burning activities emits a number of air pollutants like particulate matter (PM), sulfur dioxide (SO2), nitrogen oxides (NO...
Book
Full-text available
This book provides an overview of the fundamental concept of air pollution, emission sources of air pollutants and their transportation. First, the book presents a brief background on air pollution and its emission sources, then it continues with their impact on agriculture, health, and climate change. Furthermore, it covers the basic concepts of...
Article
Full-text available
Crop residue burning (CRB) over northern India is a major air quality and human health issue. The present study assesses the impact of PM10, PM2.5, NO2 and SO2, emitted during CRB activities in Haryana on the air quality of Delhi. The transition from pre-burning to burning period, in both rabi and kharif seasons, shows considerable increase in poll...
Chapter
The historical changes in temperature of the earth have been the concern of people since time immemorial. The exponential rise in the earth's temperature affects the production of crop plants. Taking the seriousness of such changes in temperature, it was considered important to measure them and their impact on agricultural crop production. Various...
Chapter
The discovery of methane gas in the atmosphere was first reported by an Italian scientist Alessandro Volta (1778), and its effect on global warming is described in the beginning of this chapter. Methods of methane emission measurements are described on the basis of its flux along with their advantages and disadvantages. Measurement of methane flux...
Chapter
Climate change significantly affects the water status of the soil and plants. Historical analysis of the soil and plant water status showed that it has been a topic of discussion since time immemorial. It was considered important to collect data on plant and soil water characters to explain the relationship of soil moisture and plant water status c...
Chapter
Nitrous oxide was first discovered by a British chemist Joseph Priestly in 1772. The historical analysis of its role as GHG in global warming and as a natural regulator of stratospheric ozone is described in this chapter. The quantitative measurement of nitrous oxide has been illustrated on the basis of soil surface flux distribution and using micr...
Article
Full-text available
PM10 samples were collected and atmospheric organic carbon (OC) and elemental carbon (EC) were determined during summer monsoon (SM) and winter monsoon (WM) seasons in 2016–17 at an industrial location in New Delhi, India. Owing to high combustion and emission activities in the industrial area, it was imperative to characterize the carbonaceous aer...
Chapter
This chapter starts with the historical aspect of CO2 and its natural and anthropogenic sources. Methodologies for measuring CO2 in the atmosphere, crops and soil are illustrated and explained. Technologies used for studying the responses of crop plants to the increasing concentration of CO2, namely Open Top Chamber (OTC), SPAR system, SACC technol...
Chapter
Tropospheric ozone is one of the GHGs, which adversely affects the productivity of crop plants and ecosystems, whereas stratospheric ozone protects people from harmful UV radiations. The ozone-generating system to study the effect of O3 on agricultural crops is described in detail. Open-top chambers (OTC) using filtered charcoal and ozone FACE syst...
Book
Full-text available
Covers technologies and methods including the simulation of the future climate changes. Elucidates the response of crop plants to GHGs and characterizes their responses. Includes the latest information on technologies for climate change research on agriculture. Useful literature in decision making to target policies aimed at amplifying agricultural...
Article
Full-text available
Our understanding of the processes that control the burden and budget of tropospheric ozone has changed dramatically over the last 60 years. Models are the key tools used to understand these changes, and these underscore that there are many processes important in controlling the tropospheric ozone budget. In this critical review, we assess our evol...
Article
Full-text available
To control the spread of the coronavirus (COVID-19) pandemic, the Government of India imposed various phases of lockdown starting from the third week of March 2020. Improvement in city air quality has emerged as a benefit of this lockdown in India. The objective of this paper is to quantify the health benefits due to this lockdown. PM2.5 concentrat...
Chapter
Full-text available
The carbonaceous aerosol is one of the important components of the aerosol and plays a significant role in changing climate, fluctuating air quality and health of the living being. These carbonaceous aerosols emitted by the partial burning of fossil fuels through several processes such as emissions from industries, traffic and biomass burning inclu...
Article
Full-text available
Our understanding of the processes that control the burden and budget of tropospheric ozone has changed dramatically over the last 60 years. Models are the key tools used to understand these changes, and these underscore that there are many processes important in controlling the tropospheric ozone budget. In this critical review, we assess our evol...
Book
Full-text available
Air pollution is an alarming problem, not only in terms of air quality, but also in relation to health issues. Toxic air pollutant concentrations produce harmful impacts on plant health and human health. Further, though there are various sources of air pollution, anthropogenic and biogenic sources are becoming increasingly problematic. A number of...
Article
Full-text available
The present study deals with the impact of firework activities on the variation of carbonaceous aerosols in Foggy days during in and around Diwali period vs. background period at three different sites, segregated on the basis of land-use pattern viz. JNU (dense vegetative), VN (residential) and AN (industrial) in Delhi, India. The average Organic C...
Article
Full-text available
The indoor air quality is much more matter of concern as relative to ambient or outdoor air quality, especially in the context of human health. However, very few studies have been reported for remediation of indoor ozone by plant species. The main objective of this study is to evaluate ozone deposition velocities and ozone removal effectiveness of...
Chapter
Full-text available
Globally, a number of firework events have been celebrated on a large scale in the names of different festivals. Diwali is one among the popular Indian festival held during October or November every year with huge fireworks. In the present study, various air pollutants like nitrogen oxides (NOx), particulate matter (PM2.5 and PM10) and ozone (O3) w...
Research
Full-text available
Increasing tropospheric ozone concentration is a big threat to food security due to its phytotoxicity. It causes a huge damage to crop production across the globe, especially in the C 3 plants (paddy (Oryza sativa)). The present study focuses on exposure-plant response index over different O 3 concentration. In this study, two metrics viz. the aver...
Conference Paper
Full-text available
The air quality in the capital city of India, Delhi has been worsened on regular basis since last 5 years. Most of the air pollutants (PM10, PM2.5, PM1 and black carbon) are alarmingly increasing at the rate of 3-5% particularly at busy traffic intersection sites. In this study, the variations of on-road emission factors of carbon monoxide (CO) and...
Chapter
Full-text available
Ambient air pollution is the foremost reason for global death and disease. An estimated premature death globally is related to ambient air pollution, mainly from emphysema, obstructive bronchiolitis, lung cancer, heart disease, stroke, and severe respiratory problems in children. The criteria air pollutants include particulate matter (PM), ozone (O...
Chapter
Air quality has been worsened due to increase in urbanization and industrialization both nationally and internationally. This poor air quality has affected floral and faunal diversity severely. This will affect the whole ecosystem widely. The major factors including biomass burning, high vehicular emissions, increment in industrial emissions and in...
Chapter
Full-text available
A polluted air is a harmful complex combination of primary and secondary pollutants in the atmosphere. The US Environmental Protection Agency (USEPA) listed the six most common air pollutants as criteria air pollutant under the Clean Air Act. The primary criteria air pollutants (CO, SO2, NO2, PM and Pb) are released into the atmosphere directly fro...
Chapter
Full-text available
Air quality has become a serious concern in mostly urban areas and covering different parts of the world. Over the last few years, there have been tremendous studies reported so far related to harmful health effects due to bad air quality in urban areas across the globe. Among all air pollutants, criteria air pollutants are specifically highlighted...
Article
Full-text available
Tropospheric ozone (O 3) is a phytotoxic pollutant causing harmful impacts on plant species and their metabolism. Ozone has several potential effects on plants: direct reaction with cell membranes; generation of ROS and H2O2 , negative impact on photosynthetic machinery and up or downregulation of antioxidants, defence reactions and variations in m...
Experiment Findings
SECONDARY DATA COLLECTION The collected data had a duration of 5 months (January-May, 2019). The data included pollutants viz PM 10, PM 2.5, NH3, NOx, CO, and Ozone. Furthermore, meteorological data such as WS, WD, AT, RH, SR, and BP were also collected. Data collected from the CPCB’s 'Central Control Room For Air Quality Management' website. DATA...
Chapter
Full-text available
The atmospheric hydrocarbon budget influenced by a vast range of volatile organic compounds (VOCs) is both anthropogenic and biogenic in origin. Evolution of plant VOCs is a complex process affected by interactions of plants with biotic and abiotic factors in constantly changing environment but their functional role is still a matter of speculation...
Book
Full-text available
Air pollution is a global hazard. Majority of the world’s population is affected by air pollution. Contamination of air is no more an only an atmospheric problem but now has become a health concern too. Under the Clean Air Act of 1971, a set of air pollutants are designated as criteria pollutants. These are suspected to be strongly harming the publ...
Book
Full-text available
The different chapters in this book explain about sources of air pollution i.e. both anthropogenic and biogenic, impact studies on human health, environment and economy and control methods and policies to curb air pollution.
Article
Full-text available
This Tropospheric Ozone Assessment Report (TOAR) on the current state of knowledge of ozone metrics of relevance to vegetation ( TOAR-Vegetation ) reports on present-day global distribution of ozone at over 3300 vegetated sites and the long-term trends at nearly 1200 sites. TOAR-Vegetation focusses on three metrics over vegetation-relevant time-per...
Chapter
Full-text available
The high concentration of ground-level ozone is a serious problem in many areas. Ozone formation is non-linear process and is produced from the photochemical interactions of volatile organic compounds (VOCs) and oxides of nitrogen (NOx) in the troposphere. Generally, MIR (Maximum Incremental Reactivity) scale is one of the popular ones in the asses...
Article
Full-text available
In support of the first Tropospheric Ozone Assessment Report (TOAR) a relational database of global surface ozone observations has been developed and populated with hourly measurement data and enhanced metadata. A comprehensive suite of ozone data products including standard statistics, health and vegetation impact metrics, and trend information, a...
Chapter
Full-text available
Air pollution is a widely known problem which can have significant effects on plant health. In this regard, pollutants such as air particulates, ozone, nitrogen oxides, sulphur dioxides have a negative impact on plant physiology and morphology. Recently, it has been noticed that most of the plant species are affected by tropospheric ozone and parti...
Article
Full-text available
-Air quality in most of the mega-cities has been resulted from natural as well as anthropogenic environmental conditions. As compared to developed countries, the issue of air pollution is more serious and complicated in developing countries. Air pollution can be governed by two ways such as emission and transboundary movement of air pollutants. Eac...
Chapter
Full-text available
Plants emit a substantial amount of biogenic volatile organic compounds (BVOCs) into the atmosphere having significant effects on atmospheric chemistry, physics, and the organisms. In this chapter, important facts about BVOCs’ production mechanism, storage, and emissions due to various abiotic and biotic factors have been discussed. The role of BVO...
Chapter
Full-text available
Urbanization and industrialization processes contribute significant amount of various air pollutants such as SO2, NO2, CO, particulate matter, etc. These pollutants affect plant health and emit various forms of SO2, NOx, and O3 which may act in combination of a variety of ways: additive, synergistic, and antagonistic. These pollutants can have a de...
Article
Full-text available
This review presents the status of knowledge about gasoline exhaust pollution and its impact biochemical and physiological characteristics of plants. Parameters on such as leaf conductance, membrane permeability, ascorbic acid, chlorophyll and relative water content have been used as indicators to assess the impact of gasoline exhaust pollution on...
Book
This book focuses upon air pollution, types of air pollutants and their impact on plant physiological and biochemical systems. The book begins with a brief background on air pollution and continues with a discussion on different types, effects, and solutions to the pollution. The chapters that follow, explore the different effects of pollution on c...
Article
Full-text available
The results based on the analysis of satellite fire counts detected by the Along-Track Scanning Radiometer (ATSR) sensors over different regions of India during 1998–2009 have been presented. Generally, the activities of open biomass burning show large spatial and temporal variations in India. The highest and lowest values of monthly fire counts we...
Article
Full-text available
Emissions from motor vehicle exhausts have been shown to have deleterious effects on the physiology of plant species. Our present study focuses on evaluating the tolerance and sensitivity of selected plant species viz. Dracaena deremensis (good absorber of VOCs) and Dianthus caryophyllus (susceptible to ethylene and formaldehyde (VOCs)) at selected...
Article
Full-text available
Mitigation of urban air pollution is a big challenge, especially for the metropolitan cities of the world. In an Indian metropolis like Delhi, even after the implementation of several control policies, no such remarkable change has been observed in its air quality. Globally, afforestation or greenbelt development is an effective and well-recognized...
Article
Full-text available
Air pollution kills more than 5.9 million people annually, with more than 90 per cent of these deaths in capital city of India, Delhi. For improving the status of air pollution in Delhi, various policies and laws have been implemented. But even after the implementation of CNG, there was no significant change of pollutants (NOx, O3, SPM, RSPM & CO)...
Article
Full-text available
The most universal atmospheric pollutants present in the atmosphere are one of the representatives of volatile organic compounds (VOCs), popularly known as benzene, toluene, ethylbenzene and xylene (BTEX) which have their origin from both natural and anthropogenic sources. These compounds make an important contribution in the formation of photochem...
Article
Full-text available
Various control measures have been taken to curb air pollution, such as use of plant species for the development of the green belt areas on the basis of certain physiological and biochemical parameters. Our present study emphasizes on the selection of some of the plant species which are recommended as tolerant and also for green belt develop-ment i...
Article
Black carbon is comprised of anthropogenic mixtures of sulphate, fly ash particles, organics, dust, nitrate and natural aerosols, which also give rise to the production of regional brownish hazes or atmospheric brown clouds (ABC). Black carbon is mainly produced through the incomplete combustion of solid biomass, coal or diesel fuel. The most famou...
Article
Full-text available
This paper estimates the status of air pollutants (primary pollutants and one of the secondary pollutant-tropospheric ozone) in Delhi after mandating the use of compressed natural gas (CNG). The objective of our study has two issues- whether CNG conversion has impinged on the primary pollutants and tropospheric ozone pollution profile or whether th...
Article
Full-text available
To improve the quality of air in a city like Delhi which is mainly affected by vehicular exhaust, from 2002 onwards, CNG has been introduced, which shows remarkable change in the concentration of pollutants, but even then there are some pollutants like NOx, O 3 which are still either crossing their permissible limits or at the margin of their cross...

Network