Author(s)

Michiel Roemer

Abstract

There are No Trends Like Ozone Trends Invited contribution to subproject TOR-2 Michiel Roemer TNO-MEP, P.O. Box 342, 7300 AH Apeldoorn, The Netherlands Introduction There is mounting evidence that the emissions of NO% and VOC in various countries in Europe are decreasing. According to the EMEP Emission Inventory NO%, NMVOC and CO emissions decreased from 1988 to 1995 with about 10-30 % in many countries in NW Europe (EMEP, 1996). Records of ambient air measurements seem to confirm the downward trends of these species in this part of Europe. Substantial (2-3 %/yr) downward trends of NO: concentrations over the last 5-8 years are seen at sites in Germany (Deuselbach, Waldhof), Sweden (20-30 sites in the Swedish network), The Netherlands, Belgium and The United Kingdom (Svanberg and Lindskog, 1996; de Paus and Roemer, 1997; AEA, 1995). From data at Moerdijk, a site in the Netherlands it is clear that traffic

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