AN OBJECTIVE ASSESSMENT OF THE CONNECTION BETWEEN METEOROLOGICAL ELEMENTS AND THE CONCENTRATIONS OF THE MAIN AIR POLLUTANTS AT SZEGED, HUNGARY

摘要

According to the results, four factors both for the winter and summer months can be considered as main contributors to the formation of weather and air pollution conditions at Szeged. Wind speed is an important parameter in diluting concentrations of air pollutants both in winter and summer. High wind speed is accompanied with good ventilation conditions and, consequently, with low concentration levels of primary pollutants and vice versa (Horvath et al., 2001). 63 concentrations seem to be inversely proportional to the concentrations of primary pollutants. The ozone parameters have the basic loadings in Factor 4 both for the winter and summer months. The loading of NO_2/NO ratio (in parenthesis) in Factor 4 is relatively high both for the winter and summer months. In winter, this loading indicates that only a part of the variation of O_3 is controlled by the irradiance. As a consequence of the direct proportion between the NO_2/NO ratio and the ozone parameters, higher NO_2 concentration implies higher ozone concentration and vice versa. In summer, changes of O_3 concentrations are mostly controlled by primary pollutants and not by the total amount of irradiance, which varies very little from day to day. In addition, the mean daily value of this secondary pollutant is inversely proportional to the mean daily values of the primary ones. This behaviour of O_3 can be explained by the fact that O_3 depends on the ratio of NO_2/NO. Namely, high value of this ratio implies high O_3 concentrations. It is revealed that temperature is controlled by the irradiance in summer, while this is not the case in winter, when temperature depends mainly on thermal characteristics of air masses affecting the Carpathian Basin.