During the summers of recent years, Germany and other countries in Europe - perienced a considerable number of days, where limit values for ground level ozone set for the protection of human health were exceeded. This occurred in spite of - ductions of ozone precursor emissions in Europe during the 1990s due to European and national environmental legislation. And with European air quality limit values having become more and more stringent over time, the question arises, to what - tent emission control measures will have to be implemented to achieve compliance with short and long term targets...