Unusually high levels of PAN and ozone over Berlin, Germany, during nighttime on August 7, 1998

During the BERLIOZ field campaign unusually high levels of ozone (88 ppbv) and PAN (2.5 ppbv) were detected at the Frohnau Tower just north of Berlin, Germany, in the night from 6 to 7 August 1998. In these air masses the formation of PAN was in particular favored compared to ozone due to the enhanced levels of hydrocarbons. Analyses with the particle dispersion model FLEXPART revealed that the pollution had its origin in the Netherlands and the southern United Kingdom about two days before. This event confirms previous findings that regional air quality can substantially be affected by pollution transport from remote regions and that pollution transport should be accounted for in regional air quality standards.