Q.

The most common cause of pollution of air is –

A. Carbon dioxide
B. Carbon monoxide
C. Sulphur dioxide
D. Smoke
Answer» C. Sulphur dioxide
Explanation: The most common sources of air pollution include particulates, ozone, nitrogen dioxide, and sulfur dioxide. The largest sources of SO2 emissions are from fossil fuel combustion at power plants (73%) and other industrial facilities (20%). Smaller sources of SO2 emissions include industrial processes such as extracting metal from ore, and the burning of high sulfur containing fuels by locomotives, large ships, and non-road equipment. It is linked with a number of adverse effects on the respiratory system.
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