Q.

An example of major air pollutant is –

A. Oxygen
B. Carbon monoxide
C. Helium
D. Carbon dioxide
Answer» B. Carbon monoxide
Explanation: Carbon monoxide (CO) is a colourless, odorless, non-irritating but very poisonous gas which is a product by incomplete combustion of fuel such as natural gas, coal or wood. Vehicular exhaust is a major source of carbon monoxide.
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