Monitoring of nitrogen dioxide (NO2) by passive sampling on the Danish isla
nd Funen (Fyn) show that the concentration of nitrogen dioxide is low (2-20
ppb). The level of NO2 in rural and suburban areas is governed by imported
air pollution, and elevated NO2 concentrations due to local traffic are of
limited importance. These results are supported by diffusion denuder measu
rements of nitric acid (HNO3) and particulate nitrate. Measurements of NO2
with chemiluminescence and diffusive passive sampling showed good agreement
between the methods. The special mounting device for the diffusive sampler
s used in this work seem to have reduced the turbulence at the open end of
the tube. The product from the reaction between nitrogen dioxide and trieth
anolamine was investigated and tentatively identified as triethanolamine N-
oxide, which is in accordance with the observed 1 : 1 stoechiometry in the
conversion of NO2 to nitrite ions. (C) 1999 Elsevier Science Ltd. All right
s reserved.