Air pollution is caused because of the high proportion of undesirable gases such as ________:

Methane

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Carbon dioxide

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Sulphur dioxide

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All of the above

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Solution

The correct option is D All of the above
Air pollution is mainly caused by harmful gases like sulfur dioxide, nitrogen, methane, carbon dioxide. These gases mix with the fresh air from the factory discharge and smoke emitted from vehicles. They disturb the constituents of the air. Air pollution leads to respiratory disease in human beings, reducing plant growth, etc.

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