Most important indicator of air pollution is:: (A) SO2, (B) CO2, (C) CO2, (D) N2O
Answer is A. Ans. a.SO2 Chemical indicator of air pollution:Sulfur Dioxide: Best indicator of Air Pollution.Smoke or soiling index: Air strain in a filter paper measured through photoelectric meter.Grit and dust measurementAir pollution indexSoiling indexCoefficient of hazeBiological indicator of air pollution: Lichens