What is the differences between pure air and polluted air?

Pure air is full of germs and harmful gases while polluted air contains dust particles only.

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Pure air contains harmful gases while polluted air contains very few harmful gases.

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Pure air is free from germs and harmful gases while polluted air contains harmful gases and unwanted substances.

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Pure air is free from germs and harmful gases but it contains lot of dust particles.

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Solution

The correct option is C Pure air is free from germs and harmful gases while polluted air contains harmful gases and unwanted substances.
Pure air is free from germs and harmful gases while polluted air contains harmful gases and unwanted substances.
Vehicles and industries let out some poisonous gases into the air which pollutes the air.

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Question 2

(a) The constituent of the air that contains harmful gases and dust particles is known as _______.

(b) Shortness of breath and intense cough is mainly caused to the inhalation of ______ (polluted air / fresh air).

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