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Category: Science
Word Count: 1556
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Human Effects on the Environment

This is the contamination of the atmosphere by gaseous, liquid, or solid wastes or by-products that can endanger human health and the health and welfare of plants and animals, or can attack materials, reduce visibility, or produce undesirable odours. Among air pollutants emitted by natural sources, only the radioactive gas radon is recognised as a major health threat. A by-product of the radioactive decay of uranium minerals in certain kinds of rock, radon seeps into the basements of homes built
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