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  2. Pollution in China - Wikipedia

    en.wikipedia.org/wiki/Pollution_in_China

    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.

  3. Beijing - Wikipedia

    en.wikipedia.org/wiki/Beijing

    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. [117] Later in the month another smog "red alert" was issued. [118]

  4. APEC blue - Wikipedia

    en.wikipedia.org/wiki/APEC_blue

    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 ...

  5. Air quality index - Wikipedia

    en.wikipedia.org/wiki/Air_quality_index

    The most commonly used air quality index in the UK is the Daily Air Quality Index recommended by the Committee on the Medical Effects of Air Pollutants (COMEAP). [39] This index has ten points, which are further grouped into four bands: low, moderate, high and very high. Each of the bands comes with advice for at-risk groups and the general ...

  6. List of countries by air pollution - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_air...

    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.

  7. List of most-polluted cities by particulate matter concentration

    en.wikipedia.org/wiki/List_of_most-polluted...

    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.

  8. 2013 Eastern China smog - Wikipedia

    en.wikipedia.org/wiki/2013_Eastern_China_smog

    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

  9. Environmental issues in China - Wikipedia

    en.wikipedia.org/wiki/Environmental_issues_in_China

    The movement against the project, which halted construction in 2016 [115] was “a peak in the history of China’s environmental movement.” [116] According to sociologists Yanfei Sun and Dingxin Zhao reasons for this was the higher risk involved following the environmental action and government response to the Three Gorges Dam. [117]