Class 8 Science Chapter 18 Pollution of Air and Water

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Hello Kids ! In today’s article, we are going to see about the chapter Pollution of Air and Water.

First of all, let us tell you that both air and water are essential elements for human life.

Not seeing about both together, let’s see one by one.

air pollution :
A certain composition of air is found. Whenever this composition changes, then it is taken in the category of pollution.

Composition (air) happens in this way –

Nitrogen – 78 %
Oxygen – 21 %
Other gases – 1 %
The substances which contaminate the air are called air pollutants.

Pollutants can be natural and artificial. Pollution of Air and Water

Eruption of a volcano, smoke coming out of a forest fire, etc.

The smoke coming out of vehicles is also a pollutant.

Which gas is released on incomplete combustion of petrol and diesel?
Carbon monoxide.

What effect does carbon monoxide have on the human body?
Decreases the oxygen carrying capacity of the blood.

Which gas is used in refrigerator and AC?
CFC – Chloro Fluoro Carbon.

CFC gas harms which layer of the atmosphere?
to the ozone layer.

Measure :
The following measures can be taken to reduce air pollution –

People should be made aware.
Use of clean fuel – CNG.
Use of public transport as far as possible.
Water :
This is also an important part of us. If water is there, there is future.

How does it get polluted?
Due to the flow of contaminated water coming out of the factories into the rivers and drains.
Due to bathing in water sources.
Due to washing clothes in running water.
Because of making the dead body flow in the rivers and drains.
In 1985, a scheme was started to save the river Ganga from pollution. Whose name is it?
Ganga Work Project.

What is potable water called?
Drinking Water .

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