Statistical data set
Figure 13: Annual mean concentrations of O3 in the UK, 1987 to 2025
Updated 30 June 2026
| Site type | Year | Number of sites | Mean daily maximum 8-hour mean concentration of ozone (µg/m3) | 95% confidence interval for 'All sites' (+/-) |
|---|---|---|---|---|
| Rural Background | 1987 | 5 | 55.73371991235143 | 6.721002490821205 |
| Rural Background | 1988 | 12 | 65.64981284713238 | 4.65902653387367 |
| Rural Background | 1989 | 14 | 67.86464613521295 | 4.972930964969589 |
| Rural Background | 1990 | 15 | 69.71884823213246 | 4.508190548542759 |
| Rural Background | 1991 | 12 | 66.79427101223553 | 4.455004373714796 |
| Rural Background | 1992 | 14 | 67.86418589702889 | 5.035280423722847 |
| Rural Background | 1993 | 14 | 65.2150289228646 | 5.309471715891975 |
| Rural Background | 1994 | 14 | 69.38386975693969 | 3.869373646392453 |
| Rural Background | 1995 | 15 | 70.04185376649788 | 3.8515536229490577 |
| Rural Background | 1996 | 15 | 66.70551435778978 | 3.360383384928841 |
| Rural Background | 1997 | 15 | 65.87804203213999 | 3.29199642262426 |
| Rural Background | 1998 | 17 | 68.05100491237548 | 3.2336991226563074 |
| Rural Background | 1999 | 17 | 72.20683300007326 | 2.9416324706224106 |
| Rural Background | 2000 | 15 | 67.16857708416849 | 2.9013093750763357 |
| Rural Background | 2001 | 16 | 66.1410938993261 | 3.1114515389289243 |
| Rural Background | 2002 | 18 | 66.9549309592343 | 3.0611016788436833 |
| Rural Background | 2003 | 19 | 73.12097242723769 | 3.1412200328879867 |
| Rural Background | 2004 | 19 | 71.90554171437994 | 2.6970109386339254 |
| Rural Background | 2005 | 20 | 69.588804153727 | 3.1759322373194676 |
| Rural Background | 2006 | 21 | 73.86120991150125 | 3.1855086887093966 |
| Rural Background | 2007 | 20 | 67.68682327275715 | 2.3662398590827585 |
| Rural Background | 2008 | 20 | 69.82407500365316 | 2.776703723862977 |
| Rural Background | 2009 | 22 | 67.63642721084474 | 2.6621421884459795 |
| Rural Background | 2010 | 21 | 67.06291307565299 | 2.418050673340943 |
| Rural Background | 2011 | 22 | 67.96161795716633 | 2.260180049852892 |
| Rural Background | 2012 | 21 | 65.76109515169814 | 2.32610270925699 |
| Rural Background | 2013 | 21 | 68.98841077448948 | 2.2013906277631583 |
| Rural Background | 2014 | 22 | 69.45663650932876 | 2.374208315623227 |
| Rural Background | 2015 | 22 | 71.13813046621009 | 1.8808824677695288 |
| Rural Background | 2016 | 22 | 67.24241370059269 | 2.002794643634263 |
| Rural Background | 2017 | 20 | 69.16667565957387 | 2.2448084490838482 |
| Rural Background | 2018 | 20 | 72.44044154311204 | 1.817804972097863 |
| Rural Background | 2019 | 19 | 71.61775258002882 | 2.2067736993158857 |
| Rural Background | 2020 | 19 | 71.58003088796592 | 1.9856947353517242 |
| Rural Background | 2021 | 18 | 70.59296825698311 | 1.5463638262807797 |
| Rural Background | 2022 | 18 | 73.92458943672442 | 1.9375331006913032 |
| Rural Background | 2023 | 20 | 73.20816420795705 | 1.8784457732527013 |
| Rural Background | 2024 | 21 | 71.13795007613774 | 1.7301385617433527 |
| Rural Background | 2025 | 21 | 72.70528422828653 | 1.4830419482012298 |
| Urban Background | 1992 | 4 | 39.92073153186111 | 12.52571990134069 |
| Urban Background | 1993 | 8 | 40.17707731592502 | 4.829714791003981 |
| Urban Background | 1994 | 13 | 47.42963988152938 | 3.2600838859250008 |
| Urban Background | 1995 | 12 | 50.5996907238264 | 4.459544976586015 |
| Urban Background | 1996 | 18 | 45.922459636799985 | 2.793073474879589 |
| Urban Background | 1997 | 30 | 45.25629241426082 | 2.4757514010806214 |
| Urban Background | 1998 | 42 | 48.456824565275696 | 2.3213491194353 |
| Urban Background | 1999 | 42 | 55.61305353449901 | 2.4375771508036324 |
| Urban Background | 2000 | 41 | 52.18608936383844 | 2.420435618945331 |
| Urban Background | 2001 | 43 | 51.536866966890834 | 2.083010892465729 |
| Urban Background | 2002 | 45 | 52.65908147138606 | 2.2829955453092325 |
| Urban Background | 2003 | 47 | 59.103132515058185 | 2.3206780619675804 |
| Urban Background | 2004 | 50 | 56.54815638792319 | 2.3928681557670184 |
| Urban Background | 2005 | 49 | 56.16364593245997 | 2.260301709441219 |
| Urban Background | 2006 | 48 | 60.726034552426874 | 2.4454709621894204 |
| Urban Background | 2007 | 45 | 56.36195477401128 | 2.2165191441357046 |
| Urban Background | 2008 | 43 | 58.92250747377323 | 2.6531316526826663 |
| Urban Background | 2009 | 41 | 54.77306866944599 | 2.8244744349173 |
| Urban Background | 2010 | 42 | 51.94562046678308 | 2.450785606343261 |
| Urban Background | 2011 | 43 | 57.077091186144024 | 2.4990861959711266 |
| Urban Background | 2012 | 42 | 55.0522644349753 | 1.8915001835225072 |
| Urban Background | 2013 | 41 | 59.202672522206235 | 2.2641950610632104 |
| Urban Background | 2014 | 42 | 59.938680884294236 | 2.3473225330226133 |
| Urban Background | 2015 | 42 | 60.823662331035095 | 2.0175770866384934 |
| Urban Background | 2016 | 41 | 55.91776665244533 | 2.0810884774854084 |
| Urban Background | 2017 | 41 | 58.05640198795421 | 2.256589298750658 |
| Urban Background | 2018 | 42 | 62.773883348988505 | 2.0016209023227463 |
| Urban Background | 2019 | 39 | 61.194436474651745 | 2.1813792815470334 |
| Urban Background | 2020 | 39 | 64.41525642736592 | 1.8127461338441977 |
| Urban Background | 2021 | 38 | 62.53374028857073 | 1.6229696287287543 |
| Urban Background | 2022 | 40 | 65.016460114198 | 1.647930626215242 |
| Urban Background | 2023 | 51 | 66.90217949369939 | 1.191048603444766 |
| Urban Background | 2024 | 60 | 66.08042809974208 | 1.114788454341201 |
| Urban Background | 2025 | 61 | 68.31105399795554 | 0.999242784207421 |