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Upper Elementary Science - II
3.30 Air Pollution

What is atmosphere? It is the thin blanket of air surrounding the Earth. The atmosphere is a mixture of many gases such as nitrogen, hydrogen, carbon-dioxide, etc.

What is air pollution? Adding excess amounts of gases such as carbon monoxide, carbon dioxide and other poisonous gases to atmosphere is called air pollution.

How does air pollution occur? There are many sources of pollution:

  • Smoke emission from vehicles
  • Open land fills collected with garbage, produces methane gas
  • Smoke from industries
  • Burning of fuels
Scientists believe that air pollution has been causing the depletion of ozone layer. Ozone is a protective layer of atmosphere that stops the harmful ultra-violet rays of the sun from reaching the earth. The ultra-violet rays from the sun can cause diseases such as skin cancer. Air pollution also heats up the atmosphere, which can eventually cause severe changes to the weather conditions on earth.

How can we overcome this problem? Here are some suggestions to reduce the harmful effects of air pollution:

  • Planting trees that help in cleaning up the environment
  • Proper disposal of garbage
  • Using catalytic converters in cars that help reduce pollution
  • Using vehicles powered by solar cells

Directions: Answer the following questions.
Q 1: Trees clean up the environment by
by reducing soil erosion
by bringing rain
all
releasing oxygen and making use of carbon-dioxide

Q 2: Garbage and burning of certain fuels produces____ which is a poisonous gas.
Oxygen
none
Methane
Neon

Q 3: Ozone layer is
a thick mixture of gases
a protective layer of atmosphere
none
found in the vicinity of sun

Q 4: Air is a mixture of many gases
True
False

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Question 6: This question is available to subscribers only!


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