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  • Most air pollution is caused by the burning of fossil fuels such as coal, oil, and gasoline. ??? ??? ??? photochemical smog the brown haze caused by the action of sunlight on chemicalpollutants ??? ??? ??? acid rain rain that contains more acid than normal and forms when nitrogen oxides and sulfur oxides combine with water in the air. ??? ??? ??? air the combination of gases, mostly nitrogen and o
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