The contamination of air by adding gases, smoke and ash is called .......
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Solution
The undesirable change in the physical, chemical or biological aspects of air which makes it harmful for humans, for other living organisms and for cultural assets is called air pollution.
Cause of air pollution: Volcanic eruptions release gases and ashes which pollute the air. Pollution of air by volcanic eruptions in certain geological periods seems to have changed the earth's climate. Forest fires release harmful gases. Dust storms are another factor in the pollution of air.