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Air pollution is the presence of one or more physical substance, chemical, or biological in the atmosphere in the amount that could endanger human health, animals, and plants, interfere with the aesthetics and comfort, or property damage.                                                                                                
Air pollution can be caused by natural sources and human activity. Some definitions of physical disturbances such as noise pollution, heat, radiation or light pollution is considered as air pollution. The nature of the air resulting in air pollution impacts can be both direct and local, regional and global levels.

Sources of Air Pollution
Air pollutants can be divided into two, namely, primary pollutants and secondary pollutants. Primary pollutants are substances directly arising from the pollutant sources of air pollution. [Carbon monoxide] is an example of primary air pollutants because it is the result of arson. Secondary pollutant is a contaminant substance formed from the reaction of the primary polluters of the atmosphere. Formation of ozone in the [photochemical smog] is an example of secondary air pollution.

In recent years growing concern about the effects of air pollution emissions within a global context and its relationship to global warming (global warming) that affect;

Human activities 

•  Transportation
•  Industry
•  The power plant
•  Combustion (fireplaces, stoves, furnaces, [incinerator] with various types of fuel
•  Plant flue gases that produce harmful gases such as (CFC) 

Natural sources

•  Volcano
•  Swamps
•  Forest fires
•  Biological nitrification and denitrification

Other sources

•  Transport of ammonia
•  Chlorine tank leak
•  The generation of methane gas from Uruk land / waste landfills
•  Organic solvent vapors 

The types of pollutants 

• Carbon monoxide
• Oxides of nitrogen
• Oxides of sulfur
• CFCs
• Hydrocarbons
• Ozone
• Volatile Organic Compounds
• Particulate