Question

A primary air pollutant is?

• A. $C{H}_4$
• B. $H_{2}S$
• C. CO
• D. All the above

Answer 1

Answer: (D)

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), H${}_2$S and CO/carbon monoxide, oxides of nitrogen, etc.

So, the correct option is 'All of the above'