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El Salto. (March 24, 2020). Variation in the level of nitrogen dioxide registered during the coronavirus crisis in selected Spanish cities between 10-14 March and 15-20 March 2020 [Graph]. In Statista. Retrieved October 30, 2020, from https://www.statista.com/statistics/1107696/no2-air-pollution-variation-during-the-coronavirus-crisis-spain-march/
El Salto. "Variation in the level of nitrogen dioxide registered during the coronavirus crisis in selected Spanish cities between 10-14 March and 15-20 March 2020." Chart. March 24, 2020. Statista. Accessed October 30, 2020. https://www.statista.com/statistics/1107696/no2-air-pollution-variation-during-the-coronavirus-crisis-spain-march/
El Salto. (2020). Variation in the level of nitrogen dioxide registered during the coronavirus crisis in selected Spanish cities between 10-14 March and 15-20 March 2020. Statista. Statista Inc.. Accessed: October 30, 2020. https://www.statista.com/statistics/1107696/no2-air-pollution-variation-during-the-coronavirus-crisis-spain-march/
El Salto. "Variation in The Level of Nitrogen Dioxide Registered during The Coronavirus Crisis in Selected Spanish Cities between 10-14 March and 15-20 March 2020." Statista, Statista Inc., 24 Mar 2020, https://www.statista.com/statistics/1107696/no2-air-pollution-variation-during-the-coronavirus-crisis-spain-march/
El Salto, Variation in the level of nitrogen dioxide registered during the coronavirus crisis in selected Spanish cities between 10-14 March and 15-20 March 2020 Statista, https://www.statista.com/statistics/1107696/no2-air-pollution-variation-during-the-coronavirus-crisis-spain-march/ (last visited October 30, 2020)
