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Environmental Protection Agency. (May 27, 2020). Volume of nitrogen oxides emissions in the U.S. from 1970 to 2019 (in 1,000 tons) [Graph]. In Statista. Retrieved February 25, 2021, from https://www.statista.com/statistics/501284/volume-of-nitrogen-oxides-emissions-us/
Environmental Protection Agency. "Volume of nitrogen oxides emissions in the U.S. from 1970 to 2019 (in 1,000 tons)." Chart. May 27, 2020. Statista. Accessed February 25, 2021. https://www.statista.com/statistics/501284/volume-of-nitrogen-oxides-emissions-us/
Environmental Protection Agency. (2020). Volume of nitrogen oxides emissions in the U.S. from 1970 to 2019 (in 1,000 tons). Statista. Statista Inc.. Accessed: February 25, 2021. https://www.statista.com/statistics/501284/volume-of-nitrogen-oxides-emissions-us/
Environmental Protection Agency. "Volume of Nitrogen Oxides Emissions in The U.S. from 1970 to 2019 (in 1,000 Tons)." Statista, Statista Inc., 27 May 2020, https://www.statista.com/statistics/501284/volume-of-nitrogen-oxides-emissions-us/
Environmental Protection Agency, Volume of nitrogen oxides emissions in the U.S. from 1970 to 2019 (in 1,000 tons) Statista, https://www.statista.com/statistics/501284/volume-of-nitrogen-oxides-emissions-us/ (last visited February 25, 2021)
