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Air pollution is caused by the prescence of polluting substances such as sulfur compounds and ground-level ozone in the air that should not be there. The two main sources of air pollution are transportation vehicles and fuel combustion.
Vehicles release carbon monoxide, hydrocarbons and nitrogen oxide while fuel combustion usually releases sulfur dioxide.

en.wikipedia.org/wiki/Air_pollution

Air pollution occurs when harmful substances including particulates and biological molecules are introduced into Earth's atmosphere. It may cause diseases, ...

eschooltoday.com/pollution/air-pollution/causes-of-air-pollution.html

Air pollution can result from both natural causes as well as human activities. Find out how industrial activities, burning fossil fuels and household activities all ...

www.conserve-energy-future.com/causes-effects-solutions-of-air-pollution.php

Causes, effects and solutions of air pollution: Air pollution is one such form that refers to the contamination of the air, irrespective of indoors or outside. A physical  ...

www.cleanerandgreener.org/resources/air-pollution.html

We also cause air pollution indirectly, when we buy goods and services that use energy in their production and delivery. Most of this air pollution we cause ...

www.universetoday.com/81977/causes-of-air-pollution

Apr 13, 2016 ... Air pollution is a major issue facing us Earthlings, and knowing its causes (both natural and man-made) is a key part in addressing it.

phys.org/news/2016-04-air-pollution.html

Apr 14, 2016 ... In addition, air pollution can be divided into Primary and Secondary types of pollutants. Whereas primary pollutants are caused by primary ...

www.nationalgeographic.com/environment/global-warming/pollution

Smog hanging over cities is the most familiar and obvious form of air pollution. But there are different kinds of pollution—some visible, some invisible—that ...

www.nrdc.org/stories/air-pollution-everything-you-need-know

Nov 1, 2016 ... How smog, soot, greenhouse gases, and other top air pollutants are affecting the planet—and your health.

www.renewableresourcescoalition.org/air-pollution-causes-effects-solutions

Dec 14, 2016 ... When people think of air pollution, most immediately picture heavy smog drifting over cities and industrial plants. This is the first and most ...