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CHAPTER 5 POLLUTION OF AIR AND WATER
AIR POLLUTION When unwanted substances enter the air and contaminate it causing harmful effects on both living and non-living, it is called air pollution. These unwanted substances are called air pollutants. Major air pollutants: Carbon monoxide, carbon dioxide, nitrogen oxides, smoke. Effects of air pollution: Respiratory problems, smog (smoke+ fog), global warming, reduced air quality, acid rain WATER POLLUTION When unwanted substances enter the water and contaminate it causing harmful effects on both living and non-living, it is called water pollution. These unwanted substances are called water pollutants. Major water pollutants: Sewage, industrial wastes, pesticides that wash off into water bodies. Effects of water pollution: Water related diseases, danger to aquatic life forms Potable water: Water that is suitable for drinking is called potable water. Ways to purify water: Filtering, boiling, chlorination
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