Air pollution stems from the addition of unnatural compounds and toxins through indirect and direct mechanisms. Direct sources of air pollution include electricity, fuels and transportation, while indirect sources are go... More »

Air pollution in the Philippines is at an EPI score of 65.7, as of 2010. They are ranked 8th, tied with Australia, in ambient air quality. More »

Air pollution comes from a wide range of sources, which are categorized into mobile, stationary, area and natural sources. Mobile sources include vehicles, trains and planes. Stationary sources include industries and oil... More »

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The level of air pollution varies throughout the United States from a good rating to an unhealthy rating on the air quality index scale, AQI. Prescott, Arizona, Cheyenne, Wyoming and Flagstaff, Arizona have some of the h... More »