Statistical data set
Figure 16: Monthly mean daily maximum 8-hour mean concentrations of O3 in the UK, 2025
Updated 30 June 2026
| Site type | Month | Number of sites | Mean daily maximum 8-hour mean concentration of ozone (µg/m3) | 95% confidence interval for 'All sites' (+/-) |
|---|---|---|---|---|
| Rural Background | Jan | 20 | 62.606419464999426 | 3.540428832093469 |
| Rural Background | Feb | 22 | 66.7980627831934 | 2.310534629338696 |
| Rural Background | Mar | 23 | 79.76793775805781 | 1.9838158026917518 |
| Rural Background | Apr | 21 | 89.43722735018166 | 2.000638746877958 |
| Rural Background | May | 21 | 90.08987499550395 | 1.6565940098486718 |
| Rural Background | Jun | 20 | 81.71813442592365 | 3.870563779133561 |
| Rural Background | Jul | 20 | 69.36678561462467 | 3.243629425928666 |
| Rural Background | Aug | 19 | 73.47572278952676 | 3.3925997461467445 |
| Rural Background | Sep | 21 | 63.918464115972434 | 1.9082276107401686 |
| Rural Background | Oct | 21 | 62.64848222610886 | 1.8618525429131525 |
| Rural Background | Nov | 22 | 64.09984871260887 | 2.3385107527556532 |
| Rural Background | Dec | 22 | 66.61212918548196 | 2.221961539388984 |
| Urban Background | Jan | 60 | 51.13688115268603 | 1.5878511985709496 |
| Urban Background | Feb | 59 | 59.98657485773792 | 1.5501102979653916 |
| Urban Background | Mar | 58 | 73.90274540800071 | 1.2342431649496017 |
| Urban Background | Apr | 59 | 87.04116680323348 | 1.2574315624287564 |
| Urban Background | May | 59 | 89.19557135054394 | 1.0965850560732135 |
| Urban Background | Jun | 58 | 81.99842279738529 | 1.7180793410972224 |
| Urban Background | Jul | 58 | 69.39051191066179 | 1.6275331048747206 |
| Urban Background | Aug | 61 | 73.43183292425158 | 1.4897321494627982 |
| Urban Background | Sep | 58 | 59.46385495651624 | 1.2676543342087017 |
| Urban Background | Oct | 60 | 56.93775950960752 | 1.2276895344836787 |
| Urban Background | Nov | 59 | 56.70898621091993 | 1.314138223609777 |
| Urban Background | Dec | 61 | 60.40768203180034 | 1.3434241660732789 |