Samenvatting
During February 1983 to July 1984 nitrogen oxide (NO and NO})concentrations were measured along both sides of the Dutch State Highway 75, a four lane motorway with about 30.000 vehicles per day. The measurements took place on a distance of 2, 12 and 27 meter from the motorway. The direction and speed of the wind, as well as the temperature were taken into account.The results almost approached or exceeded the existing, legal limits.