Chemistry revision
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The document discusses air pollution and its causes and effects. It states that human activity is changing the atmosphere by adding pollutants from burning fuels. Pollutants come directly from vehicle exhausts and power stations, and indirectly cause acid rain and climate change. The main gases in the atmosphere are nitrogen, oxygen and argon, and pollution affects their levels. Pollution includes carbon dioxide, carbon monoxide, sulfur dioxide and nitrogen oxides, which form acid rain. Reducing pollution involves using less electricity and fossil fuels, and improving vehicle engines and fuel sources.
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