Q. Which of the following is/are secondary pollutant(s)?
- Ozone
- Sulphur dioxide
- Nitrogen oxides
- Carbon Monoxide
Select the correct option from codes given below:
Answer:
1 Only
Notes:
- Ozone (O3) is a secondary pollutant formed by the reaction of sunlight on primary pollutants like nitrogen oxides (NOx) and volatile organic compounds (VOCs).
- Sulphur dioxide (SO2) is a primary pollutant emitted directly from activities like burning of fossil fuels.
- Nitrogen oxides (NOx) are primary pollutants emitted from combustion sources.
- Carbon monoxide (CO) is also a primary pollutant directly emitted from incomplete combustion.
So out of the given options, ozone (O3) is the only secondary pollutant.