Under the latest WHO Report on Air Quality, clear to 39 studies able and found in top 50. The report also highlighted high PM2.5 / PM10 & Ozone pollution.

Reasons for high PM2.5 / PM10: (1) High level of fossil fuel burning: (S67) energy production from fossil. (2) High vehicular emission: & Co2 / Nox. In India = largest 2/2 wheelers market. (3) Polluting industries: like cement, leather plants award etc. Fg: NCR (4) Shuttle burning: cause emission & parallel without. Reasons for Ozone Pollution: (1) Volatile emissions from classical industries (Organic & inorganic) (2) Bromine released from fossil fuel burning, garbage burning, etc. (3) Hair of pollution capture dunes, at factories. (4) High-award humidity leading to mixture these. Various steps taken by government: (1) National Air Quality Index NAQI by UCRI. (2) National Clean Air Fragrance to reduce PM2.5/PM10 by (207)