When smog floated above America’s big cities, it caused acid rain. It is sulfuric or nitric acid that falls to the ground ...

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 ...

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 ...