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Statistical data set

Figure 1: Annual mean concentrations of NO2 in the UK, 1990 to 2025

Updated 30 June 2026

Site type Year Mean concentration of NO2 (µg/m3) CI Lower Bound (95% confidence interval for 'All sites') Upper Bound (95% confidence interval for 'All sites')
Rural Background 1997 17.686948278641417 15.836476796917623 1.850471481723794 33.52342507555904
Rural Background 1998 14.483484598987197 6.125076391884707 8.358408207102489 20.608560990871904
Rural Background 1999 15.95375626523822 14.936056850139842 1.0176994150983774 30.88981311537806
Rural Background 2000 13.971204076813233 4.934370488097564 9.03683358871567 18.905574564910797
Rural Background 2001 15.474708605302071 5.145206832999082 10.32950177230299 20.619915438301152
Rural Background 2002 12.934627025714967 4.987932701949087 7.94669432376588 17.922559727664055
Rural Background 2003 14.940280717671753 4.744292816747687 10.195987900924067 19.68457353441944
Rural Background 2004 11.213787242772915 3.030747838569511 8.183039404203404 14.244535081342425
Rural Background 2005 10.35510577701316 2.7192215859087514 7.635884191104408 13.074327362921911
Rural Background 2006 10.449308527586217 2.8752972691026897 7.574011258483527 13.324605796688907
Rural Background 2007 10.452094495261182 2.476688079328883 7.9754064159323 12.928782574590064
Rural Background 2008 8.953736454052322 2.154343993422902 6.79939246062942 11.108080447475224
Rural Background 2009 8.994046701274382 2.1497330465183087 6.844313654756073 11.14377974779269
Rural Background 2010 9.371706814173265 2.7144952515075342 6.657211562665731 12.0862020656808
Rural Background 2011 9.226400455880995 2.7272767062706302 6.499123749610365 11.953677162151624
Rural Background 2012 9.731611538932711 3.114814090690635 6.616797448242076 12.846425629623345
Rural Background 2013 8.675177715357249 2.89348929030135 5.781688425055899 11.568667005658599
Rural Background 2014 7.9799167962852975 2.5498597876575144 5.430057008627783 10.529776583942812
Rural Background 2015 7.038872606460024 2.388114727535061 4.6507578789249635 9.426987333995084
Rural Background 2016 8.671214983737393 2.463093039355791 6.2081219443816025 11.134308023093183
Rural Background 2017 7.583856868102635 2.4420960975174046 5.141760770585231 10.02595296562004
Rural Background 2018 7.157888036119297 2.0450861956891395 5.112801840430157 9.202974231808437
Rural Background 2019 7.1847242112056735 2.2473383493526877 4.937385861852986 9.43206256055836
Rural Background 2020 5.526065486394602 1.9096999608576242 3.6163655255369775 7.435765447252226
Rural Background 2021 5.758472264055988 1.8195043458709277 3.9389679181850603 7.577976609926916
Rural Background 2022 6.041750516591967 1.7262536652478262 4.3154968513441405 7.768004181839793
Rural Background 2023 5.1845492229323105 1.8737024489626575 3.310846773969653 7.058251671894968
Rural Background 2024 4.6715170878455945 1.5789542714620326 3.0925628163835617 6.250471359307627
Rural Background 2025 4.955676191834742 1.7784519380090462 3.1772242538256963 6.734128129843788
Urban Background 1990 53.79893864989998 13.870858024539638 39.928080625360344 67.66979667443962
Urban Background 1991 58.690954278388105 13.33657925504179 45.354375023346314 72.0275335334299
Urban Background 1992 59.75299844025324 8.059958077084122 51.69304036316912 67.81295651733737
Urban Background 1993 52.20461275626263 4.375017465516854 47.82959529074577 56.57963022177948
Urban Background 1994 49.036977077139085 3.611386536629817 45.42559054050927 52.6483636137689
Urban Background 1995 48.02974649415015 3.618984473191071 44.41076202095908 51.64873096734122
Urban Background 1996 47.37690937665374 3.202696339827851 44.17421303682589 50.579605716481595
Urban Background 1997 46.04241650984854 3.0102437855460464 43.0321727243025 49.05266029539459
Urban Background 1998 40.67055015715819 2.929733037721304 37.74081711943688 43.600283194879495
Urban Background 1999 39.70149469137918 3.0659350769474822 36.6355596144317 42.767429768326664
Urban Background 2000 35.87412260875327 2.6589582826093427 33.21516432614393 38.53308089136261
Urban Background 2001 35.670343829886534 2.319525631181793 33.350818198704744 37.989869461068324
Urban Background 2002 32.705882686112325 2.3493808943746584 30.356501791737667 35.05526358048699
Urban Background 2003 35.092444205612715 2.7296433896663235 32.36280081594639 37.82208759527904
Urban Background 2004 32.24445677140644 2.7747159132078356 29.469740858198605 35.019172684614276
Urban Background 2005 32.22305387381452 3.179781277150604 29.04327259666392 35.402835150965124
Urban Background 2006 31.666491071216587 3.16279175932246 28.503699311894128 34.82928283053905
Urban Background 2007 28.233062671137553 2.9380519912400427 25.29501067989751 31.171114662377597
Urban Background 2008 28.04246969442369 2.6960605141416947 25.346409180281995 30.738530208565386
Urban Background 2009 28.87578730080728 2.930472307531615 25.945314993275662 31.806259608338895
Urban Background 2010 31.093382293304032 3.406624974306304 27.686757318997728 34.500007267610336
Urban Background 2011 26.72221088641617 3.120358809016145 23.601852077400025 29.842569695432317
Urban Background 2012 26.579149117739533 3.142850062585563 23.43629905515397 29.721999180325096
Urban Background 2013 25.279715254256363 2.9619582167555407 22.317757037500822 28.241673471011904
Urban Background 2014 24.79922862605246 3.330192021272163 21.4690366047803 28.129420647324622
Urban Background 2015 22.892732058550518 2.7414443205524077 20.15128773799811 25.634176379102925
Urban Background 2016 23.32265939863937 2.6026020938382364 20.720057304801134 25.925261492477606
Urban Background 2017 21.74204695134224 2.535994766188442 19.206052185153798 24.27804171753068
Urban Background 2018 20.002379344452986 2.0854466640784364 17.91693268037455 22.087826008531422
Urban Background 2019 19.56350789426593 2.0622956024156656 17.501212291850262 21.625803496681595
Urban Background 2020 15.06691545274616 1.4679508339238088 13.598964618822352 16.53486628666997
Urban Background 2021 15.865568639017743 1.5586684794218182 14.306900159595925 17.42423711843956
Urban Background 2022 15.647309988897552 1.404311156498657 14.242998832398895 17.051621145396208
Urban Background 2023 14.256446636363387 1.2281269687914749 13.028319667571912 15.484573605154862
Urban Background 2024 13.127164238455524 1.195182575262882 11.931981663192643 14.322346813718406
Urban Background 2025 13.53506983415061 1.1138591341319173 12.421210700018692 14.648928968282528
Roadside 1997 59.71508818953606 9.117784773654726 50.597303415881335 68.8328729631908
Roadside 1998 59.019197854688905 9.18861985080471 49.8305780038842 68.20781770549361
Roadside 1999 61.81444003378047 8.149121991764488 53.66531804201598 69.96356202554496
Roadside 2000 57.2570242053674 8.084417914581994 49.17260629078541 65.34144211994939
Roadside 2001 54.310351840716756 6.868613377225077 47.44173846349168 61.17896521794183
Roadside 2002 49.40470162224479 7.618837913838522 41.78586370840627 57.023539536083305
Roadside 2003 54.823275609475495 9.971699525506581 44.851576083968915 64.79497513498208
Roadside 2004 52.182026244672656 9.043168633930431 43.13885761074222 61.22519487860309
Roadside 2005 53.620065492637714 9.24095865520151 44.379106837436204 62.861024147839224
Roadside 2006 54.20622552774155 10.006038305409328 44.200187222332225 64.21226383315089
Roadside 2007 52.73554113863269 10.644783387979205 42.09075775065349 63.38032452661189
Roadside 2008 49.87652951209842 9.214010934804534 40.66251857729389 59.090540446902956
Roadside 2009 45.79915120060413 8.02792725101922 37.77122394958491 53.82707845162335
Roadside 2010 46.227337333611956 7.305950172425328 38.92138716118663 53.53328750603728
Roadside 2011 41.16570887779084 7.054604836199681 34.11110404159116 48.22031371399052
Roadside 2012 41.440285255295684 6.794303051998464 34.64598220329722 48.234588307294146
Roadside 2013 38.88387951987189 6.265297433447632 32.618582086424254 45.149176953319525
Roadside 2014 38.360041029067965 7.073432480553231 31.286608548514735 45.433473509621194
Roadside 2015 36.54008902165922 5.15457991163909 31.38550911002013 41.69466893329831
Roadside 2016 37.647956433364065 4.227101277282904 33.42085515608116 41.87505771064697
Roadside 2017 33.67734589405281 3.340826551266136 30.336519342786676 37.018172445318946
Roadside 2018 32.79977395332849 3.200437361256607 29.599336592071882 36.000211314585094
Roadside 2019 31.0788203341777 2.6197395852343144 28.459080748943386 33.69855991941201
Roadside 2020 22.925543544155932 1.8665796906222556 21.058963853533676 24.792123234778188
Roadside 2021 24.75897554653201 2.0300239936235007 22.72895155290851 26.788999540155512
Roadside 2022 23.561710048178114 1.8340126793865414 21.72769736879157 25.395722727564657
Roadside 2023 21.964544700159323 1.8548496094550753 20.109695090704246 23.8193943096144
Roadside 2024 20.65519690147203 1.5649791799963173 19.090217721475714 22.22017608146835
Roadside 2025 20.388133406789507 1.549769587084883 18.838363819704625 21.93790299387439