18th World Clean Air Congress, İstanbul, Turkey, 23 - 27 September 2019, vol.1, no.1, pp.483-491
This study was carried out at Yildiz Technical University Davutpasa Campus where is located between crowded districts of Istanbul. Main sources around the campus are Central Coach Station of Istanbul, residential buildings, small scale industrial facilities, and O-1 and O-2 highway connection. The objective of the study is to relate black carbon levels with conventional air pollutant parameters. Furthermore, determine potential sources using meteorological parameters. We monitored black carbon continuously by an aethalometer at rooftop of the Civil Engineering Faculty, typically 10 m above ground-level. Meteorological data are recorded by a Davis Vantage Pro-2 automatic weather station on the same building. Conventional ambient parameters are NO, NO2, SO2, PM2.5, and PM10. These parameters are gathered from monitoring station which is approximately 900 m away from black carbon sampling station. The station is operated by Istanbul Metropolitan Municipality. The average black carbon concentration was 2121 938 ng/m3. Spring concentration was 2217 940 ng/m3, whilst summer concentration was 1936 923 ng/m3. Less average concentration and variability was observed during summer season. The reason is attributed to decreased anthropogenic activities and increased boundary layer height. Correlation between black carbon concentrations and conventional parameters were investigated. Pearson correlation coefficients suggested that there was strong correlation (over 0.6) between BC and PM10, PM2.5, and NO2. The correlation with the remaining parameters were moderate (between 0.3 and 0.6). The correlation of black carbon with PM2.5 was slightly higher than PM10. Association of black carbon with meteorological parameters showed possible source regions and transportation patterns. Elevated black carbon concentrations were observed when the wind blew from north direction. Although studies with black carbon measurements are scarce in Istanbul, we discussed the study outcomes with the available data for Istanbul. The black carbon concentrations of this study are considerably lower than in previous studies. Temporal and spatial differences caused such concentration differences. This study fills a gap for a location that is relatively away from traffic sources when compared to relevant studies in Istanbul.