The Sources of air pollution branch out into 2 main branches.
Anthropogenic sources (human activity):
-Combustion-fired power plants
-Controlled burn practices used in agriculture and forestry management
-Motor vehicles generating air pollution emissions.
-Marine vessels, such as container ships or cruise ships, and related port air emissions
-Burning fossil fuels
-Burning wood, fireplaces, stoves, furnaces and incinerators
Other anthropogenic sources:
-chemical, dust and crop waste burning in farming
-waste deposition in landfill, which gives out methane
-military uses such as nuclear weapons and toxic gases

Natural Sources:
-Dust from natural sources, usually large areas of land with little or no vegetation.
-Methane, emitted by the digestion of food by animals, for example cattle.
-Pine trees, which emit volatile organic compounds (VOCs).
-Radon gas from radioactive decay within the Earth's crust.
-Smoke and carbon monoxide from wildfires.
-Volcanic activities which produce sulphur, chlorine and ash particulates

Since there are so many causes of air pollution, what can we do to prevent our world from being engulfed in a ball of smoke and ash?