Acid rain describes any form of precipitation that contains high levels of nitric and sulfuric acids. It can also occur in the form of snow, fog, and tiny bits of dry material that settle to Earth.

Acid rain pH. The pH scale ranges from 0 to 14. It tells you how acidic something is. Seven, in the middle, is neutral like pure water. A pH less than 7 means a substance is acidic.

In the 1970s, acid rain was one of the most serious environmental threats in North America and Europe. The air was so laden with pollution from coal power plants and cars at the time that it ...

“Acid rain is a particularly alarming demonstration of the simple adage that what goes up must come down,” former Colorado Sen. Gary Hart said in 1979.

“Acid rain is an example of a major environmental success story—the public spoke up and the politicians listened,” Gene Likens, whose work helped identify acidic rainwater in the 1960s, ...

Decades ago, acid rain was one of the world’s most alarming environmental crises. Pollution from coal power plants and cars made rainfall so toxic that it killed fish, wiped out forests, and ...

Is acid rain coming down over Ohio farmlands? Social media posts claim this is an effect of the response to the Feb. 3 train derailment in East Palestine, Ohio. A woman in a Feb. 19 Facebook video ...

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Acid rain damage across Europe and North America in the 20th century also showed the world how air pollution, which doesn’t stop at borders, can become an international crisis requiring ...

Acid rain could have formed after the controlled release and burn of chemicals Feb. 6, Kevin Crist, professor of chemical and biomolecular engineering and the director of the Air Quality Center at ...