Abstract
Traffic is the predominant source of air pollution in cities all over the world. The situation in the Netherlands is no different. Since half of the Dutch population lives in cities with more than 50.000 inhabitants a policy to improve city air quality has been developed. The policy to improve air quality in Dutch cities is layed down in air quality decrees under the Air Pollution Act. Limit values in these cities must be met by the year 2000 at the latest (Sliggers, 1989). For various substances, such as carbon monoxide (CO), lead (Pb), nitrogen dioxide (NO2), suspended particles and benzene, the limit values are being violated (RIVM, 1989).
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