Statistical data set
Figure 4: Hourly mean NO2 concentration at roadside, urban background and rural background sites, 2025
Updated 30 June 2026
| Site type | Hour | Number of sites | Mean concentration of NO2 (µg/m3) | 95% confidence interval for 'All sites' (+/-) |
|---|---|---|---|---|
| Rural Background | 1 | 12 | 5.095241670263595 | 2.0690323583695833 |
| Rural Background | 2 | 12 | 4.853568951124383 | 1.9164156171807294 |
| Rural Background | 3 | 12 | 4.695765913220408 | 1.8788451883692499 |
| Rural Background | 4 | 12 | 4.584625723634747 | 1.901494181697039 |
| Rural Background | 5 | 12 | 4.517614716480349 | 1.885071619408633 |
| Rural Background | 6 | 12 | 4.607757073736751 | 1.9442394384142925 |
| Rural Background | 7 | 12 | 4.912038994152301 | 2.0940452182389246 |
| Rural Background | 8 | 12 | 5.237809682136949 | 2.1971857997582824 |
| Rural Background | 9 | 12 | 5.280584905748655 | 2.059586578190599 |
| Rural Background | 10 | 12 | 5.026240604668752 | 1.8083762760052529 |
| Rural Background | 11 | 12 | 4.722430360103186 | 1.5482914385129118 |
| Rural Background | 12 | 12 | 4.4402785519594286 | 1.3374201898310114 |
| Rural Background | 13 | 12 | 4.245443342123386 | 1.2344415559228372 |
| Rural Background | 14 | 12 | 4.160587729028033 | 1.1223759772282729 |
| Rural Background | 15 | 12 | 4.21884384022889 | 1.0848936544005963 |
| Rural Background | 16 | 12 | 4.430464254550501 | 1.1789894747354466 |
| Rural Background | 17 | 12 | 4.825770394656638 | 1.3383509905301927 |
| Rural Background | 18 | 12 | 5.276072207668986 | 1.6272556981571953 |
| Rural Background | 19 | 12 | 5.597603045195592 | 1.877544878932077 |
| Rural Background | 20 | 12 | 5.855592482785396 | 2.1203698486793114 |
| Rural Background | 21 | 12 | 5.862318700912108 | 2.2248789035305876 |
| Rural Background | 22 | 12 | 5.680412787382856 | 2.1845530181421777 |
| Rural Background | 23 | 12 | 5.479537307524776 | 2.1480040044060336 |
| Rural Background | 24 | 12 | 5.29832012115904 | 2.154523591772995 |
| Urban Background | 1 | 60 | 12.285629517099341 | 1.065585827756382 |
| Urban Background | 2 | 59 | 10.799240270428651 | 0.9422468658460799 |
| Urban Background | 3 | 60 | 10.23344076711369 | 0.9215362274719727 |
| Urban Background | 4 | 60 | 10.050389365095823 | 0.9355547251729984 |
| Urban Background | 5 | 60 | 10.898777778224023 | 1.0430789213513192 |
| Urban Background | 6 | 60 | 12.892911877658022 | 1.2224432958208133 |
| Urban Background | 7 | 60 | 15.15308745345362 | 1.313874866707742 |
| Urban Background | 8 | 60 | 16.613302499060953 | 1.299832506930392 |
| Urban Background | 9 | 60 | 16.190646366261486 | 1.2438390359963467 |
| Urban Background | 10 | 60 | 14.30986966349891 | 1.2014634145723462 |
| Urban Background | 11 | 60 | 12.522946806426479 | 1.1261333204159387 |
| Urban Background | 12 | 60 | 11.30971364432699 | 1.0592927451780778 |
| Urban Background | 13 | 60 | 10.68957904755591 | 1.0172725389396298 |
| Urban Background | 14 | 60 | 10.587753123620903 | 1.032813267261495 |
| Urban Background | 15 | 60 | 11.050645142595856 | 1.0594305471891965 |
| Urban Background | 16 | 60 | 12.218232507645446 | 1.1227361746994795 |
| Urban Background | 17 | 60 | 13.956263842127893 | 1.1839398584039416 |
| Urban Background | 18 | 60 | 15.630189775775461 | 1.2261299989574876 |
| Urban Background | 19 | 60 | 16.73429229939719 | 1.2494791099836096 |
| Urban Background | 20 | 60 | 17.323154799255917 | 1.3117166298265823 |
| Urban Background | 21 | 60 | 17.23090717214689 | 1.3214662279234657 |
| Urban Background | 22 | 60 | 16.58576994472383 | 1.3365119675038604 |
| Urban Background | 23 | 60 | 15.416401336276653 | 1.3148879951813939 |
| Urban Background | 24 | 60 | 13.780415857884257 | 1.1924713005403642 |
| Urban Traffic | 1 | 60 | 14.138377446983082 | 1.3187245745894136 |
| Urban Traffic | 2 | 59 | 11.906140501306082 | 1.085543263118999 |
| Urban Traffic | 3 | 61 | 11.061059903583866 | 1.0270317089240326 |
| Urban Traffic | 4 | 61 | 11.275837845483174 | 1.0433129671747796 |
| Urban Traffic | 5 | 61 | 13.616031944170555 | 1.2660348717690324 |
| Urban Traffic | 6 | 61 | 18.23024930922626 | 1.5887606140423367 |
| Urban Traffic | 7 | 61 | 22.846334944958148 | 1.782378393942377 |
| Urban Traffic | 8 | 61 | 25.42887065726032 | 1.7906337450605134 |
| Urban Traffic | 9 | 61 | 25.03332029531984 | 1.7563559631641605 |
| Urban Traffic | 10 | 60 | 22.97714656977962 | 1.7637717613095025 |
| Urban Traffic | 11 | 60 | 21.37872515798784 | 1.743432344158659 |
| Urban Traffic | 12 | 60 | 20.60488772005103 | 1.7699155961033195 |
| Urban Traffic | 13 | 61 | 20.345217449758852 | 1.761216436624524 |
| Urban Traffic | 14 | 60 | 20.52066779917365 | 1.8464108819793392 |
| Urban Traffic | 15 | 61 | 21.64023313058217 | 1.8515144763637825 |
| Urban Traffic | 16 | 61 | 23.334953171292266 | 1.9073638000169688 |
| Urban Traffic | 17 | 61 | 25.177339075590933 | 1.9459392773879354 |
| Urban Traffic | 18 | 61 | 26.04619649083553 | 1.9257262643942248 |
| Urban Traffic | 19 | 61 | 25.892599697948256 | 1.8770071434991065 |
| Urban Traffic | 20 | 61 | 25.06790362025102 | 1.8373526784198495 |
| Urban Traffic | 21 | 61 | 23.60167907364996 | 1.809633776271747 |
| Urban Traffic | 22 | 61 | 21.848685271507218 | 1.791009669688131 |
| Urban Traffic | 23 | 61 | 19.548396912094503 | 1.755794710938936 |
| Urban Traffic | 24 | 61 | 16.522387128875987 | 1.5646717573021984 |