![Which of the following is a secondary pollutant?](https://www.gkseries.com/blog/wp-content/uploads/2023/09/Which-of-the-following-is-a-secondary-pollutant.jpg)
Which of the following is a secondary pollutant?
Option 1 : CO
Option 2 : CO2
Option 3 : O3
Option 4 : SO2
Which of the following is a secondary pollutant?
Option 1 : CO
Option 2 : CO2
Option 3 : O3
Option 4 : SO2
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