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Consider the following air pollutants:

1. NOX (oxides of nitrogen)

2. PAN (Peroxyacytyl nitrate)

3. CO2 (Carbon dioxide)

4. CO (Carbon monoxide)

Which of the given air pollutants is/are present in an automobile exhaust gas?


1. 1, 3 and 4
2. 1 and 2
3. 1 only
4. 2 and 3

1 Answer

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Best answer
Correct Answer - Option 1 : 1, 3 and 4

Explanation:

Emission from petrol engines contains a greater concentration of HC, CO2, and CO while the four-stroke diesel engines (buses and trucks) contain a greater concentration of NOx in addition to thick smoke and particulate matter.

AIR POLLUTANTS can be broadly classified into two general groups -

  1. primary pollutant is an air pollutant emitted directly from a source. Eg. Particulates, COx, SOx, NOx, Bacteria, Fog, Soot, Dew, etc
  2. secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere. Eg. Ozone, PAN, PBN, PPN, Smog, CFC, and Acid Rain

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