Presentation about environmental Pollution and their effects

3. Greenhouse Effect
The Trapping of heat on the
surface of earth by CO2 and
water vapour in the
atmosphere is known as
Greenhouse Effect

4. Greenhouse Effect

5. Greehouse Effect
Causes:
 Gases other than N2 and O2, especially
CO2 and H2O absorb infrared radiations
 These gases act as an insulating blanket to
prevent heat from escaping
 This causes an increase in the temperature
of earth

6. Global
Warming

8. Global Warming
 The concentration of CO2 is increased upto 400ppm
then temperature should rise as much as 1 degree
Celsius.
 The main global temperature of earth’s surface is
about 15 degree Celsius.

9. Causes of Global Warming
 Natural
 Man made

10. Causes of Global Warming
Natural
 Volcanic Eruption

11. Causes of Global Warming
Natural
 Volcanic Eruption
 Thunder Storms

12. Causes of Global Warming
Natural
 Volcanic Eruption
 Thunder Storms
 Forest Fire

13. Causes of Global Warming
Man Made
 Factories

14. Causes of Global Warming
Man Made
 Factories
 Vehicles

15. Causes of Global Warming
Man Made
 Factories
 Vehicles
 Sprays

16. Effects of Global Warming

17. Automobile
 In automobiles during
incomplete combustion of petrol
we get smoke of different gases
which pollute our environment.
 Some harmful gases which are
released from automobiles are
CO, NO and NO2 etc.

18. Production of Pollutants in Car Engine
 Combustion of petrol manily produce
gases e.g, CO, NO and NO2 .
 CO is produced due to the fast burning of
petrol and short availability of oxygen
 When petrol burns at this high temperature
N2 and O2 present in air combine and form
NO and NO2
 All these gases pollute the air

19. Control Measures
 By adding lead tetraethyl to petrol
 Catalytic oxidation

20. Additon of lead tetraethyl
 Pb(C2H5)4 is added to petrol to slow down
the rate of combustion of petrol
 This reduces the production of CO
 Thus minimizing the air pollution

21. Catalytic converter
 The unburnt hydrocarbons and CO
present in exhaust gases can be reduced
by mixing these gases with more air in the
presence of platinum catalyst
 These gases are oxidized by O2
 C8H18 + 25O2 16CO2 +18H2O
 2CO + O2 2CO2