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…
Air pollution: causes, effects, history, and responses Air pollution Air pollution is contamination of the atmosphere by harmful particles and gases. This article explains common pollutants, sources, health and environmental impacts, history, and wa…
