Page 60 - Health & Physical edu- 8

d. When the smoke from burning things mixes in the air

e. When the bad smell produced from the rotten things mixes in the air

f. The spread of germ and bacteria in the air

g. If we spray insecticides/ pesticides in the room, house or field, the air
becomes polluted

Airborne Diseases

The polluted air contains various germs and viruses. Air carries such germs and
viruses from place to place. Diseases spread from person to persons when such
germs and viruses transmit from the sick person to the healthy ones through
respiration. Similarly, such diseases can be transmitted through sputum, saliva,
nasal discharge/mucus, clothing, etc. of the infected person. Respiratory diseases
such as TB (Tuberculosis), diphtheria, whooping cough, measles, etc. can transmit
through air from person to persons.

Prevention of Air Pollution

If we check the causes of air pollution, we can prevent the air from being polluted.
The following are the measures of preventing air pollution.

a. The smoke that emits out of industries, factories and vehicles should be
controlled.

b. Forests should be conserved and greenery should be maintained.

c. Alternative sources of energy should be encouraged.

d. Old vehicles should be replaced by the new ones.

e. Enviroment friendly technology should be used in the industries and factories
to reduce the emission of smoke.

f. Leakage of harmful chemicals in the air should be controlled.

56 Health & Physical Education, Class-8