Acid rain, which is caused when pollutants such as nitrogen oxide and sulfur dioxide infiltrate precipitation, was largely mitigated by the passage of the U.S. Clean Air Act in 1990, and by the ...

While acid rain caused by sulfur dioxide is an environmental threat of the past (at least, for now), a new kind of acid is proliferating in rain water—as well as groundwater, ice cores, and even human ...

This article was written by one of our Young Reporters, a scheme that gives 14 to 18-year-old school students a chance to write for a real newspaper. Find out more at the Young Reporter website.

While the world’s first bout of acid rain (at least, in modern times) came from increased concentrations of sulfuric acid produced largely from coal plants, this new anthropogenic source is ...