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WHO. (September 28, 2016). Annual median urban exposure to ambient concentration of particulate matter (PM2.5) worlwide in 2014, by urban region (in microgram per cubic meter) [Graph]. In Statista. Retrieved March 08, 2021, from https://www.statista.com/statistics/620938/exposure-ambient-concentration-pm25-worldwide-by-region/
WHO. "Annual median urban exposure to ambient concentration of particulate matter (PM2.5) worlwide in 2014, by urban region (in microgram per cubic meter)." Chart. September 28, 2016. Statista. Accessed March 08, 2021. https://www.statista.com/statistics/620938/exposure-ambient-concentration-pm25-worldwide-by-region/
WHO. (2016). Annual median urban exposure to ambient concentration of particulate matter (PM2.5) worlwide in 2014, by urban region (in microgram per cubic meter). Statista. Statista Inc.. Accessed: March 08, 2021. https://www.statista.com/statistics/620938/exposure-ambient-concentration-pm25-worldwide-by-region/
WHO. "Annual Median Urban Exposure to Ambient Concentration of Particulate Matter (Pm2.5) Worlwide in 2014, by Urban Region (in Microgram per Cubic Meter)." Statista, Statista Inc., 28 Sep 2016, https://www.statista.com/statistics/620938/exposure-ambient-concentration-pm25-worldwide-by-region/
WHO, Annual median urban exposure to ambient concentration of particulate matter (PM2.5) worlwide in 2014, by urban region (in microgram per cubic meter) Statista, https://www.statista.com/statistics/620938/exposure-ambient-concentration-pm25-worldwide-by-region/ (last visited March 08, 2021)
