SURFACE OZONE MEASUREMENTS IN LITHUANIA

Surface ozone concentration measurement results from 1980 to 1988 are presented. The basic data were obtained at the Preila background station on the Baltic Sea shore. Two surface ozone seasonal maximums could be observed, including the spring maximum (often in May), that is characteristic to most of the Northern Hemisphere stations, and the late summer maximum (in August), determined by the transport of air masses containing high ozone concentrations from polluted areas. Analysis of the data obtained had shown that the mean hourly ozone concentration of more than 120-mu-g m-3 could be considered to be extremely high for Lithuania's conditions.