摘要：SO2, NOx und ozone trends (annual mean values,
AOT40 for ozone) as well as S and N depositions in
forested and rural areas were evaluated. SO2 and NOx
concentrations have decreased more or less significantly
since 1990, the ozone mean values show an
increasing trend, whereas AOT40-values have
decreased. The deposition rates of sulphur showed a
stronger decrease compared with those of nitrogen.
The most important airborne risk factors as regards
forest ecosystems are the still elevated ozone levels
as well as the nitrogen depositions which exceed
Critical Loads.
关键词：Level II, EMEP, sulphur dioxide, nitrogen
oxides, ozone
