CBSE Class 8 Chemistry Notes for Chapter 5 Pollution of Air and Water

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