Highlights:Graphical/Tabular Abstract Indoor and outdoor PAH concentrations in Bursa Determination of pollutant sources for PAHs Seasonal variations of PAH concentrationsIn this study, PAHs were determined by passive sampling method from indoor (kitchen and living room) air samples of 12 houses and outdoor air samples of 6 houses. Sampling was conducted in two seasons. While there was no significant difference between the summer and autumn seasons in the living rooms, the PAH concentrations in the outdoor were twice as high as the summer season. Figure A. Passive air samplers in indoor and outdoor air samplingPurpose: The aim of the study is to compare the summer and autumn seasons of PAH concentrations in indoor and outdoor air samples and to evaluate the sources of pollutants by calculating the diagnostic ratios. Theory and Methods:There are many emitting sources for PAHs in indoor environment including the cooking, smoking and domestic fuel combustion and weather conditions negative for pollution dispersion cause the increase of PAH concentrations. Therefore, indoor concentrations and distributions of toxic substances must be determined to reliably assess the level of human exposure. Results:In this study the relationship between indoor and outdoor PAH concentrations was determined. Samples of indoor air within homes have been characterized and compared with outdoor air. Sampling points are distant from each other and the internal or external environment of the pollutant source can be connected to the location of the house (proximity to the road, proximity to pollutant sources, etc.) and activities and seasons within the house. The pollutant source is generally calculated as the external environment with the start of the burning process during the autumn season. Conclusion:In the study, seasonal diagnostic ratio were calculated by taking into consideration the living room, kitchen and outdoor PAH concentrations. According to the result of the calculation, the source of PAHs is petroleum, ie traffic.
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