Air Pollution is contamination of the atmosphere by gaseous, liquid, or solid wastes or by-products that can endanger human health and the health and welfare of plants and animals, or can attack materials, reduce visibility, or produce undesirable odors. Each year industrially developed countries generate billions of tons of pollutants.

in 2012 7 million people died as a result of air pollution (4.3 million - indoor, 3.7 million - outdoor)

28% of greenhouse gases are created by transportation (62% of them are light-duty vehicles, like sedans, mini vans and pickup trucks)