Urban air pollution caused by motor-traffic

Experimental investigations on urban air pollution caused by motor-traffic have taken place in Munich, a super-city in the southern part of Germany. From summer 1990 through spring 1993, stationary and non-stationary measurements of the ,,classical" near-to-ground air pollutants NO, NO2, O-3 and CO were taken in a mobile measuring system. This consisted of a van with gas analysers together with a trailer for the power supply. The results, presented in this article, show the dependence of air pollution levels upon traffic density, meteorological conditions, urban structures, street canyon situations and various vehicular tunnels.