Acid rain

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

Source: Urban Options Acid Rain 

Nitrogen oxides (NO_x) - pH

Español: Lluvia ácida
Français: Pluie acide
Nederlands: Zure regen

Respiratory Diseases

Nitrogen Dioxide

Water Resources

Marine Litter