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Measurement of gas phase pollutants and aerosols at a mountainous site

Tuncel, Süleyman Gürdal
Yenisoy-Karakas, S
Ozer, U
Gas phase pollutants (O-3, NOx and SO2) suspended particulate matter (SPM), and major ions in aerosols were measured for 12 month period at a mountainous site of northwestern Turkey which is suffering from severe forest decline. Gaseous pollutants, SPM and meteorological parameters were measured in hourly basis with automated analyzers. Aerosol samples were collected daily. The long and short term trends in the concentrations of the measured parameters were investigated in order to understand the causes of the observed concentrations of these pollutants. Higher concentrations of O-3 during summer months were consistent with the higher photochemical production from precursor gases (NOx) with increased solar flux. The diurnal variations of O-3 and NO2 were 27 and 2.3 ppb respectively during summer. The diurnal pattern of O-3 NO, NO2 and SPM describes a photochemical smog scenario. Sulfate makes up about 30% of the total analyzed aerosol mass. A lower pH associated with a high level of SO42- and NO3- in aerosols is an indication of acid deposition. Wind sector analysis indicated the largely contributing source regions to be located in the southern and northern direction of the sampling site which is Bursa city, local industries and the nearby power plant.