Wet deposition of sulfate in eastern North America

In theory, significant reduction in SO2 emissions should, over a long-term period and large areas, produce detectable reductions in the amount of wet sulfate deposition. 

Acid rain monitoring data in North America have been gathered by Environment Canada and stored in the National Atmospheric Chemistry (NatChem) Database, details of which can be found at www.airquality.tor.ec.gc.ca/natchem. Analysis of the deposition chemistry data has confirmed that wet sulfate deposition did indeed decline in concert with the decline in SO2 emissions in both eastern Canada and the 

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