The Environment: Pollution| Grade 4 Science and Technology - Esoma-KE

- Pollution is the introduction of pollutants into the environment.
- The parts of environment that are polluted are: air, water andsoil.

- Air pollution is the introduction of harmful gases into air.
- Some of air pollutants in the environment are:

1. Bad smell
2. Dust
3. Smoke

Effects of air Pollution on living things

1. Breathing problems
2. Irritation of the eyes
3. Visibility
4. Poor growth on plants

Ways of reducing air Pollution

(i) Proper disposal of waste at home.
(ii) Use of ventilation on improved latrines.
(iii) Sprinkling ash on pit latrines.
(iv) Sprinkling water on dusty roads.

- Polluted water has harmful substances that affect living things.
- The harmful substances in the environment are called pollutants.
- The difference between clean and polluted water.

1. Clean water has no harmful substances.
2. Polluted water has harmful substances.

Water Pollutants

Some water pollutants are:

• Soil or mud
• Solid wastes

Solid wastes are plastics, papers, polythene, bottles and pieces of clothes.

Effects of Water Pollution

(i) Waterborne diseases cause vomiting and diarrhoea to human beings when they drink contaminated water.
(ii) Water pollution causes death of plants and animals.
(iii) Plants and animals cannot survive in areas with polluted water.

Ways of reducing water pollution

(i) Proper disposal of solid waste. Solid wastes include: kitchen waste, plastic and papers.
(ii) Proper disposal of dirty water in our homes.
(iii) Avoid taking bath, washing clothes or swimming in sources of water.
(iv) Fetching water for animals instead of watering them directly in rivers.

Note

Filtered water is NOT safe for drinking.
Filtered water SHOULD BE boiled before drinking.