ABC - DEF - GHI - JKL - MNO - PQRS - TUV - WXYZ

Falling rain (or snow) which has become acidic (pH less than 5.6) as a result of its combination with gaseous pollutants, such as sulphur dioxide (SO₂) and nitrogen oxides (NO_x).

Acid rain may cause acidification of surface waters, soils and ecosystems.

Source & ©: GreenFacts

Victims of acid rain - dead and dying Red Spruce in Maine

Source & ©: Urban Options Acid Rain 

Nitrogen oxides (NO_x) - pH

ABC - DEF - GHI - JKL - MNO - PQRS - TUV - WXYZ