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Question

A primary air pollutant is?

A
CH4
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B
H2S
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C
CO
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D
All the above
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Solution

The correct option is A All the above
Primary pollutants are contaminants that are emitted directly into the environment.
Their presence in the environment causes contamination without any modification required.
These include methane(VOC's), H2S and CO/carbon monoxide, oxides of nitrogen, etc.
So, the correct option is 'All of the above'

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