*According to source, these are cities at or above prefecture level (APL cities) including municipality, cities or regions at prefecture level, autonomous prefectures and league.
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Share of days failing to meet national air quality standard in China 2020-2021
Approximately *** percent of all days for *** cities in China failed to meet the national air quality standard in 2021 in terms of PM2.5 index. The air quality of China has been gradually improving after years of effort put into air pollution measures.
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Ministry of Ecology and Environment (China). (May 27, 2022). Share of total days of 339 cities* in China not reaching the national air quality standard from 2020 to 2021 [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved August 05, 2026, from /statistics/1042113/china-share-of-days-failing-to-meet-national-air-quality-standard/
Ministry of Ecology and Environment (China). "Share of total days of 339 cities* in China not reaching the national air quality standard from 2020 to 2021." Chart. May 27, 2022. ÌÇÐÄÆƽâ°æ. Accessed August 05, 2026. /statistics/1042113/china-share-of-days-failing-to-meet-national-air-quality-standard/
Ministry of Ecology and Environment (China). (2022). Share of total days of 339 cities* in China not reaching the national air quality standard from 2020 to 2021. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: August 05, 2026. /statistics/1042113/china-share-of-days-failing-to-meet-national-air-quality-standard/
Ministry of Ecology and Environment (China). "Share of Total Days of 339 Cities* in China Not Reaching The National Air Quality Standard from 2020 to 2021." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 27 May 2022, /statistics/1042113/china-share-of-days-failing-to-meet-national-air-quality-standard/
Ministry of Ecology and Environment (China), Share of total days of 339 cities* in China not reaching the national air quality standard from 2020 to 2021 ÌÇÐÄÆƽâ°æ, /statistics/1042113/china-share-of-days-failing-to-meet-national-air-quality-standard/ (last visited August 05, 2026)
Share of total days of 339 cities* in China not reaching the national air quality standard from 2020 to 2021 [Graph], Ministry of Ecology and Environment (China), May 27, 2022. [Online]. Available: /statistics/1042113/china-share-of-days-failing-to-meet-national-air-quality-standard/
