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 red alert warning, ...

Different countries have their own formulas for calculating AQI, and China’s version does not go over 500: Even if air pollution is more severe, the reported AQI will not exceed that number. Wang said ...

The sun rises over the city on a polluted morning in Beijing, China, November 18, 2021. ... its AQI hit 230 on Sunday night and climbed above 200 again on Monday.

Smog in China shaved a total of 2.5 billion years off the lives of 500 million people in the 1990s, and pollution may have caused 1.2 million premature deaths in 2010.

China defines heavily polluted days as periods with an air quality index (AQI) level over 200, which is considered “very unhealthy” or “hazardous”. On Friday afternoon, six cities in ...

Mr Forrest, the Fortescue billionaire, has been Australia’s loudest green iron champion. China has been paying attention and ...

The China Air Quality Index for Beijing stood at 282 as of 11:24 a.m. local time, the highest since May 23, according to a pollution meter published by the US Department of State.