The World Health Organisation (WHO) in its first-ever update since 2005 has tightened global air pollution standards. Global Air Quality Guidelines (AQGs) 2021 WHO announces limits for six pollutant categories —particulate matter (PM) 2.5 and 10, ozone (O3), nitrogen dioxide (NO2) sulphur dioxide (SO2) and carbon monoxide (CO). Air quality standards in India India aligns … Continue reading WHO tightens Global Air Quality norms