Page 259 - New Medley 3 Semester 1

Natural environment Man-made environment
Smoke from burning of fuels, other harmful things and chemicals enter
into the environment making it polluted.

Generally, there are four types of pollution. These are: air pollution,
land pollution, water pollution and noise pollution.

Air Pollution

Smoke is the main cause of air pollution. It is created by the burning
of fuels like coal and petroleum. It makes the air dirty and causes
breathing problems. Other sources of air pollution are smoke from

factories, sandstorms, volcanoes, forest fires. Even the bursting of crackers

on festivals and marriages causes air pollution. You should not burst
firecrackers.

Air pollution Land pollution Water pollution

257