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Asthma: A long-term respiratory condition, in which the airways may unexpectedly and suddenly narrow, often in response to an allergen, cold air, exercise, or emotional stress. Symptoms include wheezing, shortness of breath, chest tightness, and coughing.

Atmosphere: The gases surrounding the Earth or any astronomical body.

Acidic Precipitation: Any form of precipitation, including rain, snow, hail, fog, or dew, that is high in acid pollutants, especially sulfuric and nitric acid.

Acidic precipitation includes: rain, snow, hail, and sleet

Biosphere: The part of the Earth and its atmosphere capable of supporting life

CFC's: Chlorofluorocarbon

CFC is made of Clorine, Florine, and Carbon

Clean Air Act: 1970-1972: A Clean Air Act is one of a number of pieces of legislation relating to the reduction of smog and air pollution in general.

Coal and Mercury: Released in Air, pollutants

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