| Pollutants can be classified as primary and secondary. Which of these is/are primary pollutant? |
| 1. Volatile Organic Compounds |
| 2. Ground Level Ozone |
| 3. Acid Rain |
| Select the correct answer using the codes given below. |
A) 1 only
B) 1 and 2 only
C) 1 and 3 only
D) 1, 2 and 3
Correct Answer: A
Solution :
[a] 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 is a secondary pollutant.
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