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Acid rain isn't as bad in the US as it was 20 years ago, but it's still a problem. The source of acid rain is the sulfur dioxide (SO2) and nitrogen oxides (NOx) emitted by fossil-fuel power plants. These gases react with moisture in the air (H2O) to form sulfuric acid (H2SO4) and nitric acid (HNO3), respectively. Stricter emission controls, including the use of low-sulfur fuels, have reduced acid rain in the US by up to 40% in the past few decades. The first map shows sulfate deposition from 1989 to 1991, the second from 2001 to 2003:
http://www.eoearth.org/image/US_sulfate_deposition_89_91.gif
http://www.eoearth.org/image/US_sulfate_deposition_03.gif
Much of western Europe has adopted similar controls on acid-rain-producing gases, with similar results. However, acid rain is an increasingly severe problem in countries such as China, where as much as 40% of the land area is affected, and India, where the marble of the Taj Mahal is slowly being dissolved.
Much of western Europe has adopted similar controls on acid-rain-producing gases, with similar results. However, acid rain is an increasingly severe problem in countries such as China, where as much as 40% of the land area is affected, and India, where the marble of the Taj Mahal is slowly being dissolved.
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