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08-06-2016
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The greatest source of air pollution in the United States is _____. automobiles electric utilities forest fires industrial burning of fossil fuels

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09-06-2016

The correct answer is the first option. The greatest source of air pollution in the United States is automobiles. Combustion of gasoline and other fuels produces primary pollutants like nitrogen oxides, carbon monoxide and gaseous hydrocarbons.

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