science - pollution of air and water

Class 8 - Science

Pollution of Air and Water

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Notes

How does Air Get Polluted


The substances which contaminate the air are called air pollutants. Sometimes, such substances may come from natural sources like smoke and dust arising from forest fires or volcanic eruptions. Pollutants are also added to the atmosphere by human activities. The sources of air pollutants are factories, power plants, automobile exhausts and burning of firewood and dung cakes.Many respiratory problems are caused by air pollution. Let us now try to find out the substances or pollutants which are present in the polluted air. Have you noticed how rapidly the number of vehicles is increasing in our cities? Vehicles produce high levels of pollutants like carbon monoxide, carbon dioxide, nitrogen oxides and smoke. Carbon monoxide is produced from incomplete burning of fuels such as petrol and diesel. It is a poisonous gas. It reduces the oxygen-carrying capacity of the blood.Other kinds of pollutants are chlorofluorocarbons (CFCs) which are used in refrigerators, air conditioners and aerosol sprays. CFCs damage the ozone layer of the atmosphere. Recall that the ozone layer protects us from harmful ultraviolet rays of the sun. Have you heard of the ozone hole? Try to find out about it. Thankfully, less harmful chemicals are now being used in place of CFCs.

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Notes


Pollution of Air and Water - Notes
1. What is Potable Water and How is Water Purified
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2. What can be Done(What can we do to reduce air pollution?)
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3. How does Water Get Polluted
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4. Water Pollution
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5. What can be Done
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6. Air Pollution
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7. Greenhouse Effect
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8. How does Air Get Polluted
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9. Case Study The Taj Mahal
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