ICSE Class 7 Answered

The various sources of air pollution are:

1. Smoke emitted from homes by the burning of fuels like wood, cow-dung cakes, kerosoene and coal causes air pollution.

2. Use of chlorofluorocarbons in refrigeration, air conditioning and aerosol sprays causes air pollution.

3. Smoke emitted by factories, thermal power plants, oil refineries and industries causes air pollution.

4. Exhaust gases emitted by motor vehicles by the burning of petrol and diesel cause air pollution.