ATMOSPHERIC CONCENTRATIONS OF INORGANIC POLLUTANTS (NO2, SO2 AND OZONE) IN ESKİŞEHİR: SPATIAL AND VERTICAL VARIATIONS, WEEKDAY-WEEKEND DIFFERENCES

Atmospheric concentrations of inorganic pollutants (NO 2 , SO 2 and ozone) were measured at three different sampling sites in Eskisehir. Samples were collected between 25 th of March and 8 th of April 2016 by using passive sampling method. During two-week sampling study, each week was divided to three sub-periods to investigate weekday and weekend differences of the pollutant concentrations. One-time v ehicle counts during morning, noon and evening hours for both weekday and weekend periods were inspected. The highest NO 2 concentrations were measured at the sampling site having urban, traffic and residential characteristics. Positive relationship between NO 2 concentrations and traffic density was observed. Reverse trend was determined for ozone. Ozone concentrations were higher at the sampling site far from the city center. Spatial variations of SO 2 concentrations were similar to those of NO 2 . Weekday NO 2 concentrations were higher than weekend concentrations while higher ozone concentrations were observed in weekend. Weekend and weekday SO 2 concentrations were quite similar at all sampling sites. Beside spatial variations, vertical variations of each pollutant were also investigated. NO 2 concentrations decreased with the elevation and reverse case was observed for ozone with increasing concentrations at the same elevation range. SO 2 concentrations increased with the elevation due to chimney gas emissions.