Abstract
The method of passive diffusion samplers has been used for evaluation of SO 2 and NO 2 concentration levels in the Lithuanian capital Vilnius. It was analysed about 70 diffusion tubes twice per 4 seasons during 1995–1996 for each component, thus about 600 samplers were exposed and analysed including control parallel sampling. The measurement results show that the SO 2 concentrations levels depend mainly on heating and exhibit average values 7–13 μg/m 3 for warm and 17–23 μg/m 3 for cold seasons. The NO 2 average rates depend strongly on traffic (sampling place) and are highest in crossroads (52–82 μg/m 3 ) and lowest at the background-suburban level (9–16 μg/m 3 ).
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