Which of the following will not cause atmospheric pollution?

S O_{2}

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C O_{2}

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H_{2}

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Solution

The correct option is C $H_{2}$
Hydrogen gas has not shown any polluting effect in the atmosphere. When hydrogen is burnt in air, the emission is water with traces of nitrogen oxides. When hydrogen is combined with oxygen electrochemically in hydrogen-fuel cells, the main emission is water vapour. On the other hand, sulphur dioxide forms particulate matter and acid rain. Carbon dioxide acts as a greenhouse gas. Carbon monoxide forms secondary pollutant called tropospheric ozone and causes poisoning in the living body.
Hence, the correct answer is 'H $_{2}$ '.

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