Air pollution - change in the atmosphere that has a harmful effect, Emissions - Soild particle sand gases that are released into the air, Photochemical smog - thick, brownish haze formed when certian gases in the air react with sunlight, Temperature inversion - a layer of warm air that prevents the rising air from escaping, Acid rain - Precipitation that is more acidic than normal, from dissolved acids, carbon monoxide - indoor air pollution in the form of a colorless, odorless gas from burning fuels, Radon - indoor air pollution in the form of a colorless, odorless gas that forms naturally undergroung, Ozone layer - Layer in the upper atmosphere that shields us from too much UV light, CFC's chloroflorocarbons - gases from chemicals that create holes in the Ozone layer, Greenhouse effect - the trapping of heat near the Earth's surface, Global warming - increase in carbon dioxide that is increasing the temperature of the Earth,

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