H2SO4, Sulfuric acid, rises from factories, and HNO3, Nitric acid, comes from exhaust pipes.
Plants ironically require sulfur, such as K2SO4.
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Buildings made of limestone, calcium carbonate, are eroded by acid rain.
In 1963, researchers studying New Hampshire's Hubbard Brook Experimental Forest discovered that their rainfall samples were 100 times more acidic than normal.