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Explain the differences between pure air and polluted air.
Pure air is a mixture of several gases that are invisible and odorless. It consists of about 78% nitrogen, 21% is oxygen, and less than 1% of Carbon dioxide and other gases like argon, methane, and ozone, and a varying amount of water vapors.
Polluted air is contaminated with the substances like smoke, dust, and other harmful substances called pollutants. These pollutants can come from natural sources like smoke and dust arising from forest fires or volcanic eruptions. The sources of air pollution are automobile exhausts, power plants, factories and the burning of firewood and dung cakes.
[Extra information: The burning of fossil fuels is the major cause of air pollution. The burning of fossil fuels affects the environment because they release carbon dioxide and other harmful gases such as Sulphur dioxide, nitrogen oxides and carbon monoxide. These gases trap heat in the earth’s atmosphere and cause global warming which contributes to global climate change. Automobiles that burn diesel and petrol, produce SPM which remains suspended in air and reduces visibility. When inhaled, they cause diseases. Industrial activities like manufacturing of steel and mining give out SPM which also pollutes the atmosphere.]
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