| Summary: | There is now considerable evidence that Eurasia is the main source region for the pollution component of the winter Arctic aerosol, and that one of the major transport paths is from Europe eastward into the western USSR, then northward into the Arctic. Under these conditions, gases and aerosols emitted in the western USSR will contribute to the overall burden of pollution reaching the Arctic. This report attempts to evaluate the relative contributions of Western Europe, Eastern Europe and the USSR to Arctic S02 and SO4 for two possible pathways through the western USSR, by means of numerially simulated aging of air manes traversing these paths and emission of S02 according to the recent EMEP survey. The results indicate that on the mean, the USSR may contribute 47-93% of Arctic SO2 and 18-50% of Arctic S04, depending on pathway and transport speed.
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