Which of the following is are primary air pollutant 1 ground level ozone 2 ...........

Environment and Ecology Air Pollution

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Which of the following is/are primary air pollutant?

1. ground level ozone 2. photochemical smog

3. sulphur dioxide

Select the correct answer using the codes given below.

1 and 2 only

1 and 3 only

3 only

2 and 3 only

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Explanation:

A primary pollutant is an air pollutant emitted directly from a source. A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere. Ground Level Ozone is a “secondary” pollutant because it is produced when two primary pollutants react in sunlight and stagnant air. These two primary pollutants are nitrogen oxides (NOx) and volatile organic compounds (VOCs). Acid rain ofcourse is a secondary pollutant.sulphur dioxide is also primary pollutant.