Quantitive Assessment of the Importance of the Atmospheric Environment on Air Pollutant Concentrations at Regional and Local Scales in Sofia

Georgi S. Kadinov*
University of Forestry, 10 Kliment Ohridski Blvd., 1756, Sofia, BULGARIA
*Corresponding author: gkadinov@ltu.bg
Abstract. The study was carried out on the territory of the city of Sofia because of its high building density, intensive traffic and specific relief together forming preconditions for high levels of air pollutants. The study comprises data processing of 1-hour concentrations of NO, NO2, O3, and PM10, as well as meteorological data as temperature, relative humidity, global solar radiation and wind speed for 2009 – 2015. The results underline the local character of the air pollutants in the area of "Kopitoto" locality which is confirmed by the value of R – coefficient (R = -0.04 ÷ 0.12). For the other observed areas, the regional impact on the occurrence of the air pollutants is stronger or less pronounced R = (0.81 ÷ 0.96). The sole exception is „Druzhba" district where the measured concentrations of PM10 expressed strong local influence (R = - 0.36) and 3/4 of the ozone concentrations have a regional influence of their occurrence (R = 0.76).The meteorological variables have the strongest impact on the monthly concentrations of NO, NO2, and PM10, respectively (47.5%), (54.2%) and (49.1%), whereas O3 concentrations expressed the strongest dependence on meteorological variables at diurnal scale (68.3%).
Key words:  NO, NO2, O3, PM10, air pollution, meteorological variables.

Ecologia Balkanica, 2019, Special Edition 2, pp. 63-70
Article № eb.19SE201 [Full text - PDF]pdf

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