这是由于北半球煤炭燃烧的减少已经减少了二氧化硫气溶胶的排放。
This is because a decline in coal burning in the Northern Hemisphere has reduced emissions of sulphur dioxide aerosols.
而其在俄勒冈州，俄亥俄州，马苏莱州的生产线通过改善化学处理设备，以达到在2011年7月前减少二氧化硫排放的目的。
At its facility in Oregon, Ohio, Marsulex will improve chemical processing equipment, which will reduce sulfur dioxide emissions by no later than July 2011.
刘少杰称，人口控制已经将二氧化硫的排放量降低了17.6%，水污染的主要来源减少了30.8%。
According to Liu, the population controls have kept sulphur dioxide emissions down by 17.6% and the main source of water pollution by 30.8%.
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