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Polski Alarm Smogowy. (November 30, 2020). Ranking of the cities with the highest annual average concentration of carcinogenic benzopyrene in Poland in 2019 (in ng/m3) [Graph]. In Statista. Retrieved October 18, 2021, from https://www.statista.com/statistics/1069888/poland-cities-with-the-highest-concentration-of-benzo-a-pyrene/
Polski Alarm Smogowy. "Ranking of the cities with the highest annual average concentration of carcinogenic benzopyrene in Poland in 2019 (in ng/m3)." Chart. November 30, 2020. Statista. Accessed October 18, 2021. https://www.statista.com/statistics/1069888/poland-cities-with-the-highest-concentration-of-benzo-a-pyrene/
Polski Alarm Smogowy. (2020). Ranking of the cities with the highest annual average concentration of carcinogenic benzopyrene in Poland in 2019 (in ng/m3). Statista. Statista Inc.. Accessed: October 18, 2021. https://www.statista.com/statistics/1069888/poland-cities-with-the-highest-concentration-of-benzo-a-pyrene/
Polski Alarm Smogowy. "Ranking of The Cities with The Highest Annual Average Concentration of Carcinogenic Benzopyrene in Poland in 2019 (in Ng/M3)." Statista, Statista Inc., 30 Nov 2020, https://www.statista.com/statistics/1069888/poland-cities-with-the-highest-concentration-of-benzo-a-pyrene/
Polski Alarm Smogowy, Ranking of the cities with the highest annual average concentration of carcinogenic benzopyrene in Poland in 2019 (in ng/m3) Statista, https://www.statista.com/statistics/1069888/poland-cities-with-the-highest-concentration-of-benzo-a-pyrene/ (last visited October 18, 2021)
