Motor vehicles release into the air NOx, which is 50-70% of all pollutants in the atmosphere of larger cities. Both car traffic and solar radiation vary in time and consequently variation of NOx concentration occur in diumal cycle and annual cycle. The paper presents introductory results of the analysis on distribution and the relationship between oxides of nitrogen concentration and the air temperature and air humidity. Average value of considered pollutants concentration for the period since 1.IV.2001 to 31.III.2002 in Ursynów-WAU assumes 15,9 μgm m-3 (40% of permissible concentration) for NO2 and for NO 5,2 μgm m-3.
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