Air pollution

![Carbon dioxide in Earth's atmosphere if half of global-warming emissions[3][4] are not absorbed.(NASA simulation; 9 November 2015)Nitrogen dioxide 2014 - global air quality levels(released 14 December 2015).[5]](/uploads/202412/20/M15-162b-EarthAtmosphere-CarbonDioxide-FutureRoleInGlobalWarming-Simulation-201511090418.jpg)


Air pollution is the introduction of particulates, biological molecules, or other harmful materials into Earth's atmosphere, causing diseases, death to humans, damage to other living organisms such as animals and food crops, or the natural or built environment. Air pollution may come from anthropogenic or natural sources.