The atmosphere is a complex natural gaseous system that is essential to support life on planet Earth.

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Ground level ozone is a prominent example of a secondary pollutant.

Some pollutants may be both primary and secondary: they are both emitted directly and formed from other primary pollutants.

Schematic drawing, causes and effects of air pollution: (1) greenhouse effect, (2) particulate contamination, (3) increased UV radiation, (4) acid rain, (5) increased ground level ozone concentration, (6) increased levels of nitrogen oxides.

Persistent organic pollutants (POPs) are organic compounds that are resistant to environmental degradation through chemical, biological, and photolytic processes.

The United States Environmental Protection Agency has published a compilation of air pollutant emission factors for a wide range of industrial sources.

Air pollution risk is a function of the hazard of the pollutant and the exposure to that pollutant.

Dioxins and furans are two of them and intentionally created by combustion of organics, like open burning of plastics.

These compounds are also endocrine disruptors and can mutate the human genes.

Air pollution may come from anthropogenic or natural sources.