The average concentrations of sulphur dioxide,sulfate aerosol and TSP were about 8—10 ppb,15.08 μg m-3,and241.40 μg m-3 respectively,which were measured at the Lin’an regional background station during August—November,1991.The higher concentrations of SO2 and SO42- maybe acidify the rainfall.It has a great influence uponthe human health and ecosystem.The simulated results indicate that the distributions of SO2 and SO42- were deter-mined by local emission sources.Average aerosol particle number density was 2.0×104 cm-3.It shows that social devel-opment and human activities strongly affect the atmospheric background level.
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