this is about chapter 18 class 8

2. Pollution and Pollutants
Pollution is the introduction of harmful or poisonous substances
into environment
The things which are responsible for contamination of air are
called air pollutants.
There are different types of pollution they are:
Air pollution
Water pollution
Noise pollution
land pollution
In this chapter we will about
water and air pollution.

4. Air is a Mixture of
Gases
In air there are so many
gases mixed up,they are
oxygen-21 percent
nitrogen-72 percent
other gases(carbon
dioxide,argon,
methane,ozone, water
vapour)- 1 percent

5. Pollutants of air:
Carbon monoxide is produced
due to incomplete
combustion(burning) of petrol
and diesel.

7. Chlorofluorocarbon:

8. Case study -Taj mahal

11. Green House Effect:

23. Hot water a pollutant??

24. Portable water and how it is purified:
.