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Ministry of Ecology and Environment (China). (June 2, 2020). Share of total days of 337 cities* in China based on level of pollution in 2019 [Graph]. In Statista. Retrieved April 18, 2021, from https://www.statista.com/statistics/1041859/china-average-air-quality-by-level-of-pollution/
Ministry of Ecology and Environment (China). "Share of total days of 337 cities* in China based on level of pollution in 2019 ." Chart. June 2, 2020. Statista. Accessed April 18, 2021. https://www.statista.com/statistics/1041859/china-average-air-quality-by-level-of-pollution/
Ministry of Ecology and Environment (China). (2020). Share of total days of 337 cities* in China based on level of pollution in 2019 . Statista. Statista Inc.. Accessed: April 18, 2021. https://www.statista.com/statistics/1041859/china-average-air-quality-by-level-of-pollution/
Ministry of Ecology and Environment (China). "Share of Total Days of 337 Cities* in China Based on Level of Pollution in 2019 ." Statista, Statista Inc., 2 Jun 2020, https://www.statista.com/statistics/1041859/china-average-air-quality-by-level-of-pollution/
Ministry of Ecology and Environment (China), Share of total days of 337 cities* in China based on level of pollution in 2019 Statista, https://www.statista.com/statistics/1041859/china-average-air-quality-by-level-of-pollution/ (last visited April 18, 2021)
