Abstract
An experiment to study the wet fallout of sulfurous compounds released during rain or snow fall from a geographically restricted area (the city of Uppsala, Sweden) is presented. Eight tests, with 100 sampling points in each and a maximum sampling distance of 60 km from the source has been performed. Well defined but complex fallout pattern of sulfate and of free hydrogen ions are obtained for each experiment. Quantitative analysis of these patterns makes it possible to determine the characteristic scale of this fallout, which appears in most cases to be in the range 50–100km. Almost all the sulfur is found to be deposited as sulfate—only an insignificant amount is deposited as SO 2 fairly close to the source.
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