Correct answer
Sulphur dioxide and nitrogen oxides.
Sulphur dioxide and nitrogen oxides react in the atmosphere to form acids that can be deposited with precipitation. Sources include fossil-fuel combustion, industry and vehicles. This does not justify claiming that any acid rain is itself an immediate extreme driving hazard.
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Oxygen and nitrogen in their normal atmospheric proportions.
Sulphur dioxide and nitrogen oxides.
Only water vapour with no other pollutants.
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