A. G. Kelessis

A. G. Kelessis
Municipality of Thessaloniki · Department of Environment

Ph.D.

About

92
Publications
9,473
Reads
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1,393
Citations
Citations since 2016
14 Research Items
761 Citations
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
Additional affiliations
October 2012 - July 2022
Hellenic Open University
Position
  • Teaching Staff
September 1999 - July 2010
Alexander Technological Educational Institute of Thessaloniki
Position
  • Scientific cooperator

Publications

Publications (92)
Article
Full-text available
Two measurement campaigns were conducted at Thessaloniki, an urban station, (40.5°N, 22.9°E; 60 m) in the frame of the PANhellenic infrastructure for Atmospheric Composition and climatEchAnge (PANACEA) project. The first one covers the period from July to August 2019 and the second one from January to February An overview of the aerosol optical pro...
Article
Full-text available
Following the rapid spread of COVID-19, a lockdown was imposed in Thessaloniki, Greece, resulting in an abrupt reduction of human activities. To unravel the impact of restrictions on the urban air quality of Thessaloniki, NO2 and O3 observations are compared against the business-as-usual (BAU) concentrations for the lockdown period. BAU conditions...
Article
BACKGROUND AND AIM: In the LIFE ASTI project a forecasting system for estimating the urban heat island intensity (UHI) and defining high resolution heat health watch warning systems was developed in 3 Mediterranean cities, namely Thessaloniki, Rome and Heraklion. METHODS: Mortality data and temperature data for each city were collected for the peri...
Article
Full-text available
The Mediterranean is recognized among the most responsive regions to climate change, with annual temperatures projected to increase by 1–5 °C until 2100. Large cities may experience an additional stress discomfort due to the Urban Heat Island (UHI) effect. In the present study, the WRF-ARW numerical weather prediction model was used to investigate...
Chapter
Future climate simulations have been produced for three 5-year periods until the end of twenty-first century using the WRF-ARW numerical weather prediction model for the greater area of Thessaloniki in the framework of the forecasting System for urban heaT Island effect (LIFE-ASTI) programme. In the present study, we analyse the characteristics of...
Poster
Full-text available
Urban Heat Island (UHI) affects considerably human health, local economies and the environment, particularly, with regard to human health, its effect is important in over-populated regions and regions where vulnerable and high risk groups live. The LIFE ASTI project which is part-financed by LIFE programme 2014-2020, aims at developing a set of mod...
Conference Paper
Even though the actual levels of anthropogenic pollution around South Eastern Europe do not reach the ones experienced in numerous Central and Western locations such as the Po Valley, the Benelux regions, the English Channel, etc., both nitrogen and sulphur oxides remain a cause for concern for air quality issues in the area. S5P/TROPOMI offers a h...
Article
Full-text available
The continuous monitoring of environmental noise levels is deemed necessary, such in the strategic noise mapping or in the cohort studies. The environmental noise levels can be measured and analysed with the aid of various methods. In this article presents the method recommended by the European Union (EU). The data contain the road traffic noise le...
Article
Road traffic noise is a growing challenge for human health in the last decades. World Health Organization (WHO) summarized the scientific evidence on side effects of noise on public health and wellbeing since 1999 in its publication “Guidelines for community noise”. The WHO’s documentation was completed in 2009 with the Night Noise Guidelines for E...
Article
Full-text available
Air pollution has been one of the first environmental problems to be addressed by the EU and for this reason clean air is considered essential to good health. Information availability and understanding of the air quality issue is essential part of tackling it with efficiency. Having the latter in mind, the Municipality of Thessaloniki has considere...
Conference Paper
Full-text available
The aim of the present work is to present the current developments regarding indoor and outdoor air monitoring actions that the Municipality of Thessaloniki has taken in order to increase its resilience towards values described in its strategy such as Environmental Management, Health and Wellbeing and Technology Adaptation
Poster
Full-text available
The aim of the present work is to present the current developments regarding indoor and outdoor air monitoring actions that the Municipality of Thessaloniki has taken in order to increase its resilience towards values described in its strategy such as Environmental Management, Health and Wellbeing and Technology Adaptation.
Conference Paper
Full-text available
eqCO2/έτος) των άμεσα παραγόμενων αερίων θερμοκηπίου από τα βοοειδή [εντερική ζύμωση (CH4) και διαχείριση κόπρου (CH4 & Ν2Ο)] στην Περιφέρεια Κεντρικής Μακεδονίας (ΠΚΜ), για τα έτη 2013 και 2014. Για το λόγο αυτό χρησιμοποιήθηκαν στοιχεία των ΟΠΕΚΕΠΕ και ΕΛΟΓΑΚ και το εργαλείο GLEAM-i, (Global Livestock Environmental Assessment Model) που βασίζεται...
Article
Airborne urban particulate and gaseous pollutants measurements were conducted at the kerbside of a busy road and at a nearby urban background site of Thessaloniki, Greece, during a winter and a summer period. The main objective was to observe how the financial crisis has affected the air quality in the city, compared to previous measurements. Compa...
Article
Metro-railways are considered to be a sustainable means of public transportation, as they contribute substantially to the reduction of air pollutant emissions through the decrease in the number of cars and heavy vehicles circulating in the road network. However, the works related to their construction may pose an extra burden in air quality status...
Article
Full-text available
Evidence on the association between short-term exposure to desert dust and health outcomes is controversial. To estimate the short-term effects of particulate matter ≤ 10 μm (PM10) on mortality and hospital admissions in 13 south-European cities, distinguishing between PM10 originating from desert and from other sources. We identified desert dust a...
Article
Previous studies reported significant variability of air pollutants across Europe with the lowest concentrations generally found in Northern Europe and the highest in Southern European countries. Within the MED-PARTICLES project the spatial and temporal variations of long-term PM and gaseous pollutants data were investigated in traffic and urban ba...
Article
We investigated the short-term effects of particles with aerodynamic diameter less than 2.5 μm (PM2.5), between 2.5 and 10 μm (PM2.5–10) and less than 10 μm (PM10) on deaths from diabetes, cardiac and cerebrovascular causes, lower respiratory tract infections (LRTI) and chronic obstructive pulmonary disease (COPD) in 10 European Mediterranean metro...
Article
Monitoring of particulate concentrations in Thessaloniki, Greece, was carried out during April 2011, to assess differences in commuters’ exposure to traffic related particulate pollution. Three routes were monitored in the two directions while bicycling, driving car and travelling by bus. The length of each route was about 8 km and individual journ...
Article
Full-text available
BACKGROUND: Few studies have investigated the independent health effects of different size fractions of particulate matter (PM), in multiple locations, especially in Europe. OBJECTIVES: We estimated the short-term effects of PM with aerodynamic diameter less than 10μm (PM10), less than 2.5μm (PM2.5), and between 2.5 and 10μm (PM2.5-10) on all-cause...
Article
During the last years several attempts were made to introduce various air quality indices, defined for a specific air pollutant or a mixture of pollutants, based on standards and guidelines proposed by international organizations. In this work, air quality data (CO, SO2, O3, PM10 and NO2) corresponding to the six-year period between 2004 and 2009 a...
Article
During the last years several attempts were made to introduce various air quality indices, defined for a specific air pollutant or a mixture of pollutants, based on standards and guidelines proposed by international organizations. In this work, air quality data (CO, SO2, O3, PM10 and NO2) corresponding to the six-year period between 2004 and 2009 a...
Article
Health can be impacted in many ways by exposure to chemical stressors in urban areas. Epidemiological research community has established consistent associations between traffic related air pollution and various health outcomes. Nevertheless, many urban environments, due to practical reasons (bulk of equipment) and mainly due to economical constrain...
Article
During the last years several attempts were made to introduce various air quality indices, defined for a specific air pollutant or a mixture of pollutants, based on standards and guidelines proposed by international organizations. In this work, air quality data (CO, SO2, O3, PM10 and NO2) corresponding to the six-year period between 2004 and 2009 a...
Article
The identification of local and remote particulate pollution sources, as well as the understanding of the factors determining the spatial and temporal variability of the particulate matter in urban areas is an issue of increasing public concern, since the above actions are absolutely essential for the design of effective particulate pollution contr...
Article
Full-text available
Since air pollution levels are strongly dependent on atmospheric conditions, it is important to take both into consideration when examining the effects of weather on human health. In this study, the discomfort conditions were estimated by using several air-quality stress indices based on air-pollutant concentrations in the center of Thessaloniki. A...
Article
Full-text available
Taking into consideration the heavily stressed air quality conditions in the city of Thes-saloniki, Greece, an attempt was made to study the temporal fluctuations in heat wave occurrence and intensity during the summer period (June, July and August) for the years 1970–2005. The results demonstrate a continuous warming trend as well as the increase...
Article
Full-text available
Heat stress-related mortality is among main impacts of climatic extremes on human society. An extreme heat wave can be catastrophic or not depending on its intensity, extent and duration, but also on the population adaptation to the local climate and the awareness of the public authorities. Excess monthly mortality was established, for total and ca...
Article
Full-text available
As a result of climate change, heat waves are expected to increase in severity and frequency. Hot weather extremes appear to have a profound effect on human health and well-being. In addition, humidity affects human comfort, and the perceived temperature by humans is largely dependent on atmospheric moisture content. The danger posed by the combine...
Article
Full-text available
In the present study, an attempt was made to give a preliminary estimate of heat-related mortality in northern Greece, during the summer period, for the years 1970–2009, with special regard to extreme heat waves. Long-term trends in the human mortality data, for the hot period of the year, can be influenced by different demographic factors (change...
Article
A CFD dispersion model is presented to predict the local effect of heavily travelled roads on air pollution concentrations measured at certain monitoring stations in the commercial center of Thessaloniki. The model used in this study is a three dimensional CFD model with the shearstress transport k-ω turbulence scheme. The complex topography of the...
Article
Despite indications of high hydrogen sulfide levels in some urban environments, only sparse measurements have been reported in the literature. Here we present one full year of hydrogen sulfide measurements in an urban traffic site in the city of Thessaloniki, Greece. In this 1-million-population city the H2S concentrations were surprisingly high, w...
Article
Full-text available
Air pollution episodes in urban coastal areas follow certain pre-determined patterns, being associated with certain local meteorological conditions and emission of primary pollutants. In this study, the synoptic and local scale atmospheric circulation that prevails during air pollution episodes in a coastal major city in Greece, Thessaloniki, is ex...
Article
Full-text available
The present study refers to experimental ambient air hydrocarbon measurements in the city of Thessaloniki, Greece, from May to July 2006. The measurements are performed at two sites of the Municipal Air Quality Network of Thessaloniki, at the commercial city center (11.4 m asl) and at an urban peripheral site (174.0 m asl). The two locations, city...
Article
A theoretical investigation is presented on the approximate solutions of the radiation budget equation in complex terrain. A method of calculating an exact solution to the net radiation balance is also developed and compared to the commonly used approximations. The suggested procedure adopts the effects of multiple reflections of the longwave radia...
Article
The measurement of expired carbon monoxide (CO) is a direct and non-invasive method for the detection of exposure to CO. Our aim was to investigate the impact ofatmospheric pollution and smoking on expired CO in kiosk workers in Thessaloniki, Greece. Twenty kiosks were selected in the commercial centre of city. The workers were all men aged 30.5 +/...
Article
Full-text available
Spectral measurements of the aerosol optical depth (AOD) and the Angstrom coefficient were conducted at Thessaloniki, Greece (40.5 degrees N, 22.9 degrees E) between January 1997 and December 2005 with a Brewer MKIII double-monochromator spectroradiometer. The dataset was compared with collocated measurements of a second spectroradiometer ( Brewer...
Article
In this study, quasicontinuous measurements of major aromatic volatile organic compounds (VOCs), which include benzene, toluene, ethylbenzene, and xylenes were carried out by means of an automatic gas chromatograph (GC-PID analyzer), in the urban air of Thessaloniki, at a mean level of 27 m above ground, during the years 2003 and 2004. The highest...
Chapter
Past fuel energy crises and current high crude oil prices have forced the scientists to investigate the use of renewable fuels, thus succeeding in reducing the world's dependence on fuels derived from petroleum products. Plant oils and their derivatives have been studied for their use as renewable fuels, but their impact upon the engine performance...
Article
This study reports systematic ambient PM2.5 measurements during 2004-2005, for the first time in urban Thessaloniki area. PM10 concentrations have been also measured in Thessaloniki from 1989 until today. The measurements are performed at a central site, in the Thessaloniki area, using tapered element oscillating microbalance (TEOM) and beta-absorp...
Article
Full-text available
In this study, the synoptic scale atmospheric circulation prevailing during 1989-2004 air pollution episodes in the greater area of Thessaloniki (GTA) was examined. The episodes are defined on the basis of the main pollutants measured (SO2, PM10, black smoke, CO, NO2 and O 3) on an hourly basis, at five monitoring stations of the Municipal Air Qual...
Article
In this study a simple semi-empirical scheme is presented which gives estimates of net all-wave radiation and surface sensible, latent and ground heat fluxes from routine weather data during daytime in complex terrain. The suggested methodology is based on the following fundamental assumptions: The radiation balance is primarily driven by incoming...
Article
This presentation describes systematic urban traffic noise measurements, at the Municipal permanent noise & air pollution monitoring station, at the commercial center of Thessaloniki, in northern Greece, for a period of more than a year (December 2003-December 2004). Mean hourly, daily, weekly and seasonally noise levels (Leq, L1, L10, L50, L90, L9...
Article
One year of hydrogen sulfide measurements in an urban traffic site were used to assess the importance of traffic in the overall high ambient air burden of H2S (mean annual concentration of 8 μg/m3). During calm nighttime hours, hourly values of H2S were correlated positively with those of CO (R2 = 0.75) and SO2 (R2 = 0.70), suggesting a common sour...
Article
This study reports systematic ambient PM10 measurements at the Municipal Air Quality Network of Thessaloniki, from 1989 to 2000. PM10 concentrations were measured by two different methods, the beta-gauge principle and the tapered element oscillating microbalance method. The correlation between the two daily PM10 concentrations (derived from the abo...
Article
Air quality data obtained at the Thessaloniki air monitoring stations, during the years 1989-1999, were analysed to determine the long-term trends in air quality. The SO2, H2S, smoke, CO, PM10 and TSP concentrations indicated that there was a marked decrease in the levels since 1991. The dominant influences of this reduction appear to be the signif...
Article
Data obtained with a Brewer spectrophotometer are used to calculate the total columnar amount of sulphur dioxide concentrations over the industrial area of Thessaloniki, in Northern Greece. Using a two-dimensional numerical diffusion box model estimates of the effective mixing height of the polluted layer, the mean residence time and average vertic...
Article
The aim of the present study is to analyze sulphur dioxide and suspended particle concen¬trations in the urban area of Thessaloniki, The air pollution data span over a period of almost ten years, from 1989 to 1997. By combining the diurnal and seasonal variability and spatial distribution of these pollutants we provide useful informations of the ai...
Article
The aim of the present study is to analyze sulphur dioxide and suspended particle concen¬trations in the urban area of Thessaloniki, The air pollution data span over a period of almost ten years, from 1989 to 1997. By combining the diurnal and seasonal variability and spatial distribution of these pollutants we provide useful informations of the ai...
Article
The main purpose of this study is to analyse the diurnal variability of air pollutants (e.g., carbon monoxide, sulphur dioxide, nitric oxide, nitrogen dioxide, ozone and smoke) using different fitted probability density functions and establish the relationship between emissions standards and street-canyon air quality levels in the commercial center...
Article
In this paper an analysis of SO2, NO, NO2, O3, smoke and CO concentration levels, measured by a monitoring network in Thessaloniki area from 1989 to 1993, is attempted. The seasonal variability and long-term trends in air quality and their causes are discussed. The observed significant decreasing trends in SO2 and smoke concentrations are due to th...
Article
The purpose of this study is to analyse the diurnal variability of CO concentration observations using different fitted statistical distributions. A simple microscale dispersion model was also used to predict the local effect of heavily-travelled roads on carbon monoxide concentrations measured at certain monitoring stations in the Thessaloniki bas...
Article
The properties of the Gaussian plume equation have led many industrial designers to plan their stack system so that ambient pollutant concentrations are reduced to levels considered safe from the standpoint of undesirable effects. This paper demonstrates the characteristics of worst‐case maximum air concentrations due to an elevated point source di...
Article
Solar Ultraviolet spectrophotometric measurements are used to provide estimates of the total columnar sulphur dioxide concentrations over urban, semirural and industrial areas of Thessaloniki in Northern Greece. The systematic observations of the SO2 column represent an estimate of the impact of anthropogenic sulphur dioxide on the solar radiation...
Article
Nomograms were constructed to determine relations among different stability parameters in the surface layer. The variables interrelated were the Monin-Obukhov stability parameter, ξ=z/L, the bulk Richardson number, Rib, and the PasquillA-F stability classes. Also, the nomograms were used to estimate the Monin-Obukhov length variation, with respect...
Article
The aim of the present study is to analyse emissions of SO2, NO2, particulates and radionuclides from the lignite fired power stations in the Ptolemais-Kozani valley in the northern part of Greece. A thermodynamic model is proposed to calculate ground-level concentrations under inversion break-up fumigations.
Article
A dynamic grid-based numerical model and a simple microscale dispersion model (based on the physical principle of mass conservation) were used to predict the local effect of heavily travelled roads on CO-concentrations measured at nearby monitoring stations in the Athens and Thessaloniki basin.
Article
Observations of total columnar amount of SO2, O-3, NO2 and stratospheric NO2 column have been made with the Brewer spectrophotometer #036, in the industrial area of Thessaloniki (40.5 degrees N, 20.9 degrees E), in Northern Greece. The diurnal and seasonal variations of these pollutants and their causes are discussed and compared with measurements...
Article
A three-dimensional numerical model for predicting the time-dependent dynamic behavior of chemically reacting air pollutants in the Athens basin is developed. The model is used to estimate the spatial and temporal distribution of CO, SO2, NO, NO2 and O-3 emissions in Athens. The model results were also validated and compared with actual measurement...
Article
Characteristics of air pollution episode concentrations from an elevated continuous point source are derived from the Gaussian plume equation. The critical wind speed, critical plume rise and downwind distance are also obtained. The suggested methodology should be especially useful for determining compliance with air pollution episode criteria and...
Article
A three-dimensional, grid-based numerical air pollution model for the estimation of the mean ground and total concentrations of SO2 in the Thessaloniki area is developed. Based on the continuity equation, the modeling system incorporates the combined influences of advective transport, turbulent diffusion and source emissions. The urban sources of S...
Chapter
Semiempirical formulations which have been proposed to describe the surface layer wind and potential temperature profiles, were used to derive relationships between the wind profile power-law exponent, p, the Monin-Obukhov scaling length, L, and the surface roughness parameter, z0. Nomograms were constructed for ξ=z/L, as a function of ξ0=z0/L and...
Article
Full-text available
Relationships between the bulk Richardson number, B, and other stability parameters were derived for the atmospheric surface layer. Nomograms were constructed, relating the Monin-Obukhov stability parameter, z/L, to B. The nomograms and the graph of Golder (1972) were used to establish various schemes for classifying z/L, B and Ri, in terms of the...
Article
Semi-empirical formulae, which have been proposed to estimate the Monin-Obukhov lengthL, are used to derive equations predicting the surface roughness lengthz 0 and the potential temperature θ0 at heightz 0, using routine meteorological measurements. The friction velocityu * is obtained from the computed values ofL andz 0.
Article
The variation of the wind profile power-law exponent (p) with respect to changes in atmospheric stability is depicted using the formulation of Ku et al. (1987) for specifying the Monin-Obukhov scaling length (L) under stable atmospheric conditions. The theoretical estimates for the bulk approximation of p as a function of L under stable conditions...