Evaluation of SO2 and NO2 Concentration Levels in Lithuania Using Passive Diffusional Samplers

Abstract

Sometimes there is a need for determination of air pollution levels at remote places far from local sources with rather good spatial distribution evaluation. It is useful to use diffusive sampler where the sorbed amount must be proportional to the ambient concentration of the gas. The gas is transported to the sorbent by molecular diffusion and the diffusion rate is made constant by placing the impregnated filter inside a tube1.