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WHO. (September 28, 2016). Annual median exposure to ambient concentration of particulate matter (PM2.5) worlwide in 2014, by region (in micrograms per cubic meter) [Graph]. In Statista. Retrieved March 05, 2021, from https://www.statista.com/statistics/620890/exposure-ambient-concentration-pm25-worldwide-by-region/
WHO. "Annual median exposure to ambient concentration of particulate matter (PM2.5) worlwide in 2014, by region (in micrograms per cubic meter)." Chart. September 28, 2016. Statista. Accessed March 05, 2021. https://www.statista.com/statistics/620890/exposure-ambient-concentration-pm25-worldwide-by-region/
WHO. (2016). Annual median exposure to ambient concentration of particulate matter (PM2.5) worlwide in 2014, by region (in micrograms per cubic meter). Statista. Statista Inc.. Accessed: March 05, 2021. https://www.statista.com/statistics/620890/exposure-ambient-concentration-pm25-worldwide-by-region/
WHO. "Annual Median Exposure to Ambient Concentration of Particulate Matter (Pm2.5) Worlwide in 2014, by Region (in Micrograms per Cubic Meter)." Statista, Statista Inc., 28 Sep 2016, https://www.statista.com/statistics/620890/exposure-ambient-concentration-pm25-worldwide-by-region/
WHO, Annual median exposure to ambient concentration of particulate matter (PM2.5) worlwide in 2014, by region (in micrograms per cubic meter) Statista, https://www.statista.com/statistics/620890/exposure-ambient-concentration-pm25-worldwide-by-region/ (last visited March 05, 2021)
