pollution is important point to consider in environmental issues.

2.  Pollution occurs when harmful substances or
pollutants are added to the environment.
 There are 4 main types of pollution-
1) Air pollution
2) Water pollution
3) Noise pollution
4) Soil pollution

3.  Air pollution is defined as the presence of any
harmful substances (solid, liquid, gas) in the
air.
 There are many gases are originated in air
pollution eg. Carbon dioxide, oxides of
nitrogen, sulpher dioxide.

4.  Issues of air pollution-
a) Acid rain
b) Depletion of ozone layer
c) Global warming

5.  Water pollution is defined as adding of
harmful substances into the water and make
it contaminated.
 There are few examples of water pollution-
 Industrial waste discharge
 Sewage waste
 Agriculture runoff

6.  Soil pollution is caused due to the adding of
harmful substances into the soil.
 It decreases fertility and quality of soil.
 Material causes soil pollution are- pesticides,
fertilizers, solid wastes.

8.  Noise pollution is caused due
to high level of sound.
 There are various sources of
noise pollution eg.
Loudspeakers, automobiles,
aeroplanes, industrial activities
etc.
 Any noise above 80dB causes
noise pollution.

9. Thank you
Made by –
Shikhar Soni