Abstract
An exposure type sampler for ambient levels of gases was developed on the basis of molecular diffusion. It was applied to the measurement of NO2 in the ambient air. The effect of wind velosity on the collection rate is eliminated by using capillary tubes with high diffusion resistance. TEA-H2O-DMS0 was selected as a collecting solution for NO2. Measurements of NO2 were found to be in good agreement with the values obtained by a conventional chemiluminescence method.
