The levels of nitrogen dioxide, a pollutant that originates mainly by combustion engines burning fuel, dropped drastically in Spain during the first week of forced confinement as announced by the Spanish government the 15th of March 2020. As of that day, the level of air pollution in the coastal city of Valencia decreased from 114 to 42, which represents a drop of 64 percent in the level of nitrogene dioxide.
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El Salto. (March 24, 2020). Decrease 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 ÌÇÐÄÆƽâ°æ. Retrieved July 27, 2026, from /statistics/1107684/no2-air-pollution-fall-during-the-coronavirus-crisis-spain-march/
El Salto. "Decrease 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. ÌÇÐÄÆƽâ°æ. Accessed July 27, 2026. /statistics/1107684/no2-air-pollution-fall-during-the-coronavirus-crisis-spain-march/
El Salto. (2020). Decrease in the level of nitrogen dioxide registered during the coronavirus crisis in selected Spanish cities between 10-14 March and 15-20 March 2020. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 27, 2026. /statistics/1107684/no2-air-pollution-fall-during-the-coronavirus-crisis-spain-march/
El Salto. "Decrease in The Level of Nitrogen Dioxide Registered during The Coronavirus Crisis in Selected Spanish Cities between 10-14 March and 15-20 March 2020." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 24 Mar 2020, /statistics/1107684/no2-air-pollution-fall-during-the-coronavirus-crisis-spain-march/
El Salto, Decrease in the level of nitrogen dioxide registered during the coronavirus crisis in selected Spanish cities between 10-14 March and 15-20 March 2020 ÌÇÐÄÆƽâ°æ, /statistics/1107684/no2-air-pollution-fall-during-the-coronavirus-crisis-spain-march/ (last visited July 27, 2026)
Decrease 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], El Salto, March 24, 2020. [Online]. Available: /statistics/1107684/no2-air-pollution-fall-during-the-coronavirus-crisis-spain-march/
