Research and analysis
A5: Roadside nitrogen dioxide (NO2) concentrations in England, 1997 to 2024
Updated 1 December 2025
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| year | measure | value |
|---|---|---|
| 1997 | Annual mean NO2 concentration | 59.7150881895361 |
| 1998 | Annual mean NO2 concentration | 58.2421847401745 |
| 1999 | Annual mean NO2 concentration | 61.3486972955186 |
| 2000 | Annual mean NO2 concentration | 56.4165323749898 |
| 2001 | Annual mean NO2 concentration | 54.2851679382296 |
| 2002 | Annual mean NO2 concentration | 51.7460264579612 |
| 2003 | Annual mean NO2 concentration | 58.4535310530144 |
| 2004 | Annual mean NO2 concentration | 55.5277125350862 |
| 2005 | Annual mean NO2 concentration | 57.8571404880921 |
| 2006 | Annual mean NO2 concentration | 58.249537457326 |
| 2007 | Annual mean NO2 concentration | 59.0593623602558 |
| 2008 | Annual mean NO2 concentration | 53.4815790715562 |
| 2009 | Annual mean NO2 concentration | 48.0721795830657 |
| 2010 | Annual mean NO2 concentration | 47.9592403469598 |
| 2011 | Annual mean NO2 concentration | 43.8786467751698 |
| 2012 | Annual mean NO2 concentration | 42.5531736739609 |
| 2013 | Annual mean NO2 concentration | 41.0290040437522 |
| 2014 | Annual mean NO2 concentration | 40.0199909267891 |
| 2015 | Annual mean NO2 concentration | 35.9040574528848 |
| 2016 | Annual mean NO2 concentration | 37.8314501026157 |
| 2017 | Annual mean NO2 concentration | 33.2629084881828 |
| 2018 | Annual mean NO2 concentration | 32.2916744882663 |
| 2019 | Annual mean NO2 concentration | 30.3998643529547 |
| 2020 | Annual mean NO2 concentration | 23.0021429743374 |
| 2021 | Annual mean NO2 concentration | 24.6496947146002 |
| 2022 | Annual mean NO2 concentration | 23.7935607630583 |
| 2023 | Annual mean NO2 concentration | 22.2260231916815 |
| 2024 | Annual mean NO2 concentration | 20.7078297608939 |
| 1997 | 95% confidence interval upper bound | 68.83287296319082 |
| 1998 | 95% confidence interval upper bound | 68.01916883678724 |
| 1999 | 95% confidence interval upper bound | 70.00708570314492 |
| 2000 | 95% confidence interval upper bound | 64.79222570234055 |
| 2001 | 95% confidence interval upper bound | 61.46574430377335 |
| 2002 | 95% confidence interval upper bound | 59.20644443272396 |
| 2003 | 95% confidence interval upper bound | 68.9673527202994 |
| 2004 | 95% confidence interval upper bound | 65.01648245530552 |
| 2005 | 95% confidence interval upper bound | 67.30473006257895 |
| 2006 | 95% confidence interval upper bound | 68.7829713252888 |
| 2007 | 95% confidence interval upper bound | 70.4400561172975 |
| 2008 | 95% confidence interval upper bound | 64.5095480323298 |
| 2009 | 95% confidence interval upper bound | 57.16764038068 |
| 2010 | 95% confidence interval upper bound | 56.5659489659537 |
| 2011 | 95% confidence interval upper bound | 52.72405210162684 |
| 2012 | 95% confidence interval upper bound | 50.55379318470644 |
| 2013 | 95% confidence interval upper bound | 48.80016628302673 |
| 2014 | 95% confidence interval upper bound | 48.88336059275075 |
| 2015 | 95% confidence interval upper bound | 42.09526962025977 |
| 2016 | 95% confidence interval upper bound | 42.8147042242538 |
| 2017 | 95% confidence interval upper bound | 36.95951498725097 |
| 2018 | 95% confidence interval upper bound | 35.92340882326284 |
| 2019 | 95% confidence interval upper bound | 33.13475110245202 |
| 2020 | 95% confidence interval upper bound | 25.04584796547965 |
| 2021 | 95% confidence interval upper bound | 26.75729146374735 |
| 2022 | 95% confidence interval upper bound | 25.982588690632028 |
| 2023 | 95% confidence interval upper bound | 24.39032889942769 |
| 2024 | 95% confidence interval upper bound | 22.51076716723842 |
| 1997 | 95% confidence interval lower bound | 50.59730341588137 |
| 1998 | 95% confidence interval lower bound | 48.46520064356176 |
| 1999 | 95% confidence interval lower bound | 52.69030888789228 |
| 2000 | 95% confidence interval lower bound | 48.04083904763906 |
| 2001 | 95% confidence interval lower bound | 47.10459157268585 |
| 2002 | 95% confidence interval lower bound | 44.28560848319844 |
| 2003 | 95% confidence interval lower bound | 47.9397093857294 |
| 2004 | 95% confidence interval lower bound | 46.03894261486688 |
| 2005 | 95% confidence interval lower bound | 48.40955091360524 |
| 2006 | 95% confidence interval lower bound | 47.7161035893632 |
| 2007 | 95% confidence interval lower bound | 47.6786686032141 |
| 2008 | 95% confidence interval lower bound | 42.4536101107826 |
| 2009 | 95% confidence interval lower bound | 38.9767187854514 |
| 2010 | 95% confidence interval lower bound | 39.3525317279659 |
| 2011 | 95% confidence interval lower bound | 35.03324144871276 |
| 2012 | 95% confidence interval lower bound | 34.55255416321536 |
| 2013 | 95% confidence interval lower bound | 33.25784180447767 |
| 2014 | 95% confidence interval lower bound | 31.15662126082745 |
| 2015 | 95% confidence interval lower bound | 29.71284528550983 |
| 2016 | 95% confidence interval lower bound | 32.8481959809776 |
| 2017 | 95% confidence interval lower bound | 29.56630198911463 |
| 2018 | 95% confidence interval lower bound | 28.65994015326976 |
| 2019 | 95% confidence interval lower bound | 27.66497760345738 |
| 2020 | 95% confidence interval lower bound | 20.95843798319515 |
| 2021 | 95% confidence interval lower bound | 22.542097965453053 |
| 2022 | 95% confidence interval lower bound | 21.60453283548457 |
| 2023 | 95% confidence interval lower bound | 20.061717483935308 |
| 2024 | 95% confidence interval lower bound | 18.904892354549386 |