the addition of harmful gases and substance in air
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Addition of such substances to the atmosphere modifies it. When air is contaminated by unwanted substances which have a harmful effect on both the living and the non-living, it is referred to as air pollution. 18.2 How does Air Get Polluted? The substances which contaminate the air are called air pollutants.
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The addition of harmful substances to air because of human activities is called as AIR POLLUTION.
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