2. Pollution is the introduction of harmful substances or products into the environment

3. Types of pollution
1. Air pollution
2. Water pollution
3. Noise pollution
4. land pollution

4. Air pollution

5. Air pollution
Definition: is the introduction into the atmosphere of chemicals, particulates, or biological materials that cause discomfort, disease, or death to humans, damage other living organisms such as food crops, or damage the natural environment.

6. Causes of Air Pollution
The release of carbon dioxide into the atmosphere, because of Deforestation and fossil fuel burning.
Sulfur dioxide is released into the atmosphere by the burning of sulfur containing compounds of fossil fuels. Sulfur oxides are very dangerous to humans at a high concentration. Sulfur in the atmosphere is responsible for acid rain

7. Chlorofluorocarbons (CFCs) also contribute to air pollution by reducing the amount of ozone the stratosphere.
CFCs come from a variety of sources such as:
The burning of plastic foam items
Leaking refrigerator equipment
Spray cans

8. Natural air pollutants can include:
Smoke from wild fires
Methane released from live stock
Volcanic eruptions

9. Effect of air pollution on health
Air pollutants commonly affect the respiratory tract resulting in:
a. Immediate effect: acute bronchitis, dyspnoea, suffocation and death
b. Delayed effect: chronic bronchitis, lung cancer, bronchial asthma, emphysema and respiratory allergy.

11. Water Pollution
Factors that contribute to water pollution can be categorized into two different groups
Point sources
Non-point sources

12. Point Sources
They are called point sources because they are direct sources of water pollution and can be reduced and monitored
point sources of water pollution include
Waste products from factories
Waste from sewage system
Waste from power plants
Waste from underground coalmines
Waste from oil wells

13. Example of a point source

14. Non-point Sources
The term non-point source encompasses a large range of sources such as:
when rain or snow moves through the ground and picks up pollutants as it moves towards a major body of water
the runoff of fertilizers from farm animals and crop land
air pollutants getting washed or deposited to earth
storm water drainage from lawns, parking lots, and streets

15. Non-point source: Agricultural runoff

16. Effect of water pollution on health
Water born diseases like diarrhea, cholera, typhoid fever, malaria, trachoma,…..etc.

17. Thank you