Question raised in Lok Sabha on Permissible Level of Pollutants, 22/12/2017. Government of India has laid down National Ambient Air Quality standards (NAAQS) for twelve air pollutants, namely, PM10, PM2.5, Carbon Monoxide (CO), Sulphur Dioxide (SO2), Nitrogen Dioxide (NO2), Ammonia (NH3), ground level Ozone (O3), Lead, Arsenic, Nickel, Benzene and Benzo (a) Pyrene. The relevant standards are annexed. The NAAQS helps in assessment of air quality with respect to various pollutants and development of preventive and corrective measures for mitigation. Compliance with NAAQS can lead to significant abatement of air pollution in the country. Further, the Government has notified 115 emission / effluent standards for 104 different industrial sectors besides 32 general ambient standards for various pollutants. Compliance to the notified environment standards is likely to protect and improve the quality of the environment.