by Air Pollution Facts
(US)
Air pollution threatens the health of human beings and other living things on our planet. While often invisible, pollutants in the air create smog and acid rain, cause cancer or other serious health effects, diminish the protective ozone layer in the upper atmosphere, and contribute to the potential for world climate change.
http://www.greenliving9.com/air-pollution-facts-air-pollution-levels.html
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