Acid rain: causes, chemistry, effects and responses Acid rain Acid rain is precipitation with elevated acidity (pH below about 5.6) produced when air pollutants form acids in the atmosphere. This article explains its formation, impacts, histo…
Nitrogen dioxide (NO2) — properties, sources, and impacts Nitrogen dioxide Nitrogen dioxide (NO2) is a reddish-brown, toxic gas formed by combustion. It is an oxidant in the atmosphere, contributes to smog and acid rain, and is an important industrial int…
