state gov TSPSC Group 3 (తెలంగాణ గ్రూప్ 3) 2023 Mock Test Series General Knowledge Ecology and Environment Environmental pollution
Which of the following air pollutant is not mentioned in the WHO Air quality guidelines?
1
Ozone (O3)
2
Nitrogen dioxide (NO2)
3
Sulfur dioxide (SO2)
4
Carbon dioxide (CO2)