SURFACE OZONE CONCENTRATIONS AND EXPOSURES DURING GROWING-SEASON AT THE LITHUANIAN RURAL SITE

The surface ozone (O-3) data show an increase by 2.6% per year during the period 1982-1994 at the rural site of Lithuania. WHO (World Health Organization), UN-ECE (United Nations Economic Commission for Europe) , CES (Commission or the European Communities) guideline values for th e protection of vegetation from adverse effects are exceeded during th e growing season at the Preila coastal station. Ozone exposures for di fferent concentration threshold are estimated during daylight hems in April-September. These values above 60 mu g/m(3) varied between 10 000 and 43 000 (mu g/m(3)). h, above 80 mu g/m(3) - between 1700 and 15 0 00 (mu g/m(3)). h, above 100 mu g/m(3) - between 130 and 3700 (mu g/m( 3)). h during separate years. Maximum hourly ozone values were observe d from 116 to 228 mu g/m(3) during this period.