Dr Kirsty Pringle, a researcher from the University of Edinburgh who helped create these charts, says: 'Air pollution is ... some Asian countries like China where pollution has fallen steeply ...

China has also been ... Russia's invasion of Ukraine. This chart shows the countries with the largest post-pandemic decreases in annual average PM2.5 particle air pollution (in μg/m³).

SEE ALSO: Beijing welcomed 2017 from beneath a blanket of smog The AQI, which is used by China to measure air pollution, is officially limited at 500. An AQI of 500 for a 24-hour period triggers a ...