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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