The average concentration of nitrogen dioxide (NO2) measured at roadside sites in the United Kingdom was **** micrograms per cubic meter air (µg/m3) in 2023. NO2 concentrations plummeted more than ** percent in 2020 as traffic levels dropped as a result of COVID-19-related lockdowns. Although NO2 concentrations rebounded in 2021, they have since continued to decline.
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GOV.UK, & Defra. (April 30, 2024). Annual mean concentrations of nitrogen dioxide (NO2) from urban traffic in the United Kingdom from 2000 to 2023 (in micrograms per cubic meter air) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 25, 2026, from /statistics/1233189/roadside-concentrations-of-nitrogen-dioxide-uk/
GOV.UK, und Defra. "Annual mean concentrations of nitrogen dioxide (NO2) from urban traffic in the United Kingdom from 2000 to 2023 (in micrograms per cubic meter air)." Chart. April 30, 2024. ÌÇÐÄÆƽâ°æ. Accessed July 25, 2026. /statistics/1233189/roadside-concentrations-of-nitrogen-dioxide-uk/
GOV.UK, Defra. (2024). Annual mean concentrations of nitrogen dioxide (NO2) from urban traffic in the United Kingdom from 2000 to 2023 (in micrograms per cubic meter air). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 25, 2026. /statistics/1233189/roadside-concentrations-of-nitrogen-dioxide-uk/
GOV.UK, and Defra. "Annual Mean Concentrations of Nitrogen Dioxide (No2) from Urban Traffic in The United Kingdom from 2000 to 2023 (in Micrograms per Cubic Meter Air)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 30 Apr 2024, /statistics/1233189/roadside-concentrations-of-nitrogen-dioxide-uk/
GOV.UK & Defra, Annual mean concentrations of nitrogen dioxide (NO2) from urban traffic in the United Kingdom from 2000 to 2023 (in micrograms per cubic meter air) ÌÇÐÄÆƽâ°æ, /statistics/1233189/roadside-concentrations-of-nitrogen-dioxide-uk/ (last visited July 25, 2026)
Annual mean concentrations of nitrogen dioxide (NO2) from urban traffic in the United Kingdom from 2000 to 2023 (in micrograms per cubic meter air) [Graph], GOV.UK, & Defra, April 30, 2024. [Online]. Available: /statistics/1233189/roadside-concentrations-of-nitrogen-dioxide-uk/
