Most impoant indicator of Air pollution is:-: (A) SO2, (B) CO2, (C) CO, (D) N2O
Answer is A. The best indicators of air pollution are sulfur dioxide, smoke and suspended paicles. Various indicators used: Chemical: SO2 , NO2, CO, Air pollution index, Soiling index, Coefficient of haze. Biological: Lichens BEST Overall- SO2