Abstract

The ozone concentrations measured at the regional monitoring station in Loenen in summer 1991 were considered to be suspiciously low. Measurement results were analysed and it was found that the station's results were - probably due to emissions from local traffic - not representative for ozone levels in the region. The decision was taken to relocate the station. At the proposed new location measurement have been undertaken using a mobile monitoring station ; these have indicated that the new site is not influenced by traffic and does provide regionally representative values.