Which of the following is not a pollutant unless present in excess?
(a) sulphur dioxide
(b) carbon dioxide
(c) carbon monoxide
(d) nitrogen dioxide

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Solution

(b) carbon dioxide

Carbon dioxide is considered a pollutant only when its level of concentration in the air is too high. Whereas sulphur dioxide, carbon monoxide and nitrogen dioxide are hazardous gases and are considered pollutants even at low levels of concentration.

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Which of the following is not a pollutant unless present in excess? (a) sulphur dioxide (b) carbon dioxide (c) carbon monoxide (d) nitrogen dioxide

(b) carbon dioxideCarbon dioxide is considered a pollutant only when its level of concentration in the air is too high. Whereas sulphur dioxide, carbon monoxide and nitrogen dioxide are hazardous gases and are considered pollutants even at low levels of concentration.

Which of the following is not a pollutant unless present in excess?
(a) sulphur dioxide
(b) carbon dioxide
(c) carbon monoxide
(d) nitrogen dioxide

(b) carbon dioxide

Carbon dioxide is considered a pollutant only when its level of concentration in the air is too high. Whereas sulphur dioxide, carbon monoxide and nitrogen dioxide are hazardous gases and are considered pollutants even at low levels of concentration.