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B
unburnt carbon particles or hydrocarbons suspended in air
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C
lack of adequate power supply
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D
none of these
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Solution
The correct option is B unburnt carbon particles or hydrocarbons suspended in air Smog is a dark brown or greyish smoky mist that occurs in cold weather. It is formed by unburnt carbon particles or hydrocarbons suspended in the air. It is a visible indication of air pollution. Smog not only reduces visibility but is highly suffocating and harmful to human beings, animals and plants.