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Acid rain is a form of environmental pollution caused by the release of acidic substances into the atmosphere, which later return to the earth’s surface through rain, snow, fog, or dust. It mainly occurs when sulphur dioxide (SO₂) and nitrogen oxides (NOₓ) are emitted from human activities such as burning fossil fuels in power plants, factories, vehicles, and other industrial _____ ___ _____ ________ _________ ________ _______.
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