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Beijing launched the four-color alert system in 2013. It is based on the air quality index (AQI), which indicates how clean or polluted the air is. [80] The Beijing government revised their four-color alert system at the start of 2016, increasing the levels of pollution required to trigger orange and red alerts.
During and prior to these events, Beijing's air quality improved dramatically, only to fall back to unhealthy levels shortly after. On 8 and 9 December 2015 Beijing had its first smog alert which shut down a majority of the industry and other commercial businesses in the city. [118] Later in the month another smog "red alert" was issued. [119]
All data are valid for the year 2022 and are taken from the Air Quality Life Index (AQLI) of the University of Chicago.In addition to particulate matter pollution, the modeled potential loss of life expectancy of the population due to particulate matter pollution is given.
In Oct 2014, the air quality index in Beijing reached a peak of 470, far beyond the severe pollution level of 300; meanwhile, the situation was even more serious in the neighboring province of Hebei, whose PM2.5 particles climbed above 500 micrograms per cubic meter—northern China was blanketed by the heavy air pollution, forcing the Chinese ...
The United States Environmental Protection Agency (EPA) has developed an Air Quality Index that is used to report air quality. This AQI is divided into six categories indicating increasing levels of health concern. A PM 2.5 concentration lower than 12 μg/m 3 indicates good air quality and between 12 and 35 μg/m 3 the
Beijing recorded its longest cold wave since records began in 1951 as the biting temperatures and snowfall experienced in the Chinese capital and elsewhere began to ease.. The temperature recorded ...
This list contains the top 500 cities by PM2.5 annual mean concentration measurement as documented by the World Health Organization covering the period from 2010 to 2022. The January 2024 version of the WHO database contains results of ambient (outdoor) air pollution monitoring from almost 5,390 towns and cities in 63 countries.
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