Statistical data set
Figure 18: Average number of days when levels of ozone, particulate matter, nitrogen dioxide and sulphur dioxide were 鈥楳oderate鈥� or higher at urban sites in the UK, 2010 to 2025
Updated 30 June 2026
| Pollutant | Year | Mean number of days per urban site with moderate or above pollution | Number of sites |
|---|---|---|---|
| Nitrogen Dioxide | 2010 | 4.96078431372549 | 51 |
| Nitrogen Dioxide | 2011 | 2.25 | 52 |
| Nitrogen Dioxide | 2012 | 2.0377358490566038 | 53 |
| Nitrogen Dioxide | 2013 | 1.4807692307692308 | 52 |
| Nitrogen Dioxide | 2014 | 1.3125 | 48 |
| Nitrogen Dioxide | 2015 | 1.02 | 50 |
| Nitrogen Dioxide | 2016 | 1.1818181818181819 | 55 |
| Nitrogen Dioxide | 2017 | 0.5409836065573771 | 61 |
| Nitrogen Dioxide | 2018 | 0.47619047619047616 | 63 |
| Nitrogen Dioxide | 2019 | 0.0945945945945946 | 74 |
| Nitrogen Dioxide | 2020 | 0 | 73 |
| Nitrogen Dioxide | 2021 | 0 | 69 |
| Nitrogen Dioxide | 2022 | 0.011627906976744186 | 86 |
| Nitrogen Dioxide | 2023 | 0 | 89 |
| Nitrogen Dioxide | 2024 | 0 | 89 |
| Nitrogen Dioxide | 2025 | 0 | 94 |
| Ozone | 2010 | 3.9310344827586206 | 29 |
| Ozone | 2011 | 7.275862068965517 | 29 |
| Ozone | 2012 | 5.633333333333334 | 30 |
| Ozone | 2013 | 5.407407407407407 | 27 |
| Ozone | 2014 | 4.37037037037037 | 27 |
| Ozone | 2015 | 3.5555555555555554 | 27 |
| Ozone | 2016 | 5.6 | 25 |
| Ozone | 2017 | 3.4615384615384617 | 26 |
| Ozone | 2018 | 14.08 | 25 |
| Ozone | 2019 | 10.0625 | 32 |
| Ozone | 2020 | 17.34285714285714 | 35 |
| Ozone | 2021 | 5.787878787878788 | 33 |
| Ozone | 2022 | 14.052631578947368 | 38 |
| Ozone | 2023 | 14.291666666666666 | 48 |
| Ozone | 2024 | 9.24561403508772 | 57 |
| Ozone | 2025 | 18.789473684210527 | 57 |
| PM10 | 2010 | 5.595238095238095 | 42 |
| PM10 | 2011 | 13.688888888888888 | 45 |
| PM10 | 2012 | 7.921568627450981 | 51 |
| PM10 | 2013 | 6.395348837209302 | 43 |
| PM10 | 2014 | 5.977777777777778 | 45 |
| PM10 | 2015 | 4.627450980392157 | 51 |
| PM10 | 2016 | 3.574074074074074 | 54 |
| PM10 | 2017 | 3.5833333333333335 | 60 |
| PM10 | 2018 | 2.3620689655172415 | 58 |
| PM10 | 2019 | 5.928571428571429 | 70 |
| PM10 | 2020 | 1.5975609756097562 | 82 |
| PM10 | 2021 | 1.5696202531645569 | 79 |
| PM10 | 2022 | 3.5764705882352943 | 85 |
| PM10 | 2023 | 1.263157894736842 | 95 |
| PM10 | 2024 | 0.8787878787878788 | 99 |
| PM10 | 2025 | 2.034188034188034 | 117 |
| PM2.5 | 2010 | 9.372093023255815 | 43 |
| PM2.5 | 2011 | 19.65909090909091 | 44 |
| PM2.5 | 2012 | 13.1875 | 48 |
| PM2.5 | 2013 | 11.217391304347826 | 46 |
| PM2.5 | 2014 | 9.956521739130435 | 46 |
| PM2.5 | 2015 | 6.625 | 48 |
| PM2.5 | 2016 | 5.239130434782608 | 46 |
| PM2.5 | 2017 | 5.673913043478261 | 46 |
| PM2.5 | 2018 | 2.9545454545454546 | 44 |
| PM2.5 | 2019 | 6.9491525423728815 | 59 |
| PM2.5 | 2020 | 2.234375 | 64 |
| PM2.5 | 2021 | 1.1833333333333333 | 60 |
| PM2.5 | 2022 | 2.984375 | 64 |
| PM2.5 | 2023 | 0.6025641025641025 | 78 |
| PM2.5 | 2024 | 0.5 | 82 |
| PM2.5 | 2025 | 2.2018348623853212 | 109 |
| Sulphur Dioxide | 2010 | 0.6428571428571429 | 28 |
| Sulphur Dioxide | 2011 | 0.7037037037037037 | 27 |
| Sulphur Dioxide | 2012 | 0.8636363636363636 | 22 |
| Sulphur Dioxide | 2013 | 0.21052631578947367 | 19 |
| Sulphur Dioxide | 2014 | 0.11764705882352941 | 17 |
| Sulphur Dioxide | 2015 | 0.1111111111111111 | 18 |
| Sulphur Dioxide | 2016 | 0.11764705882352941 | 17 |
| Sulphur Dioxide | 2017 | 0 | 17 |
| Sulphur Dioxide | 2018 | 0 | 15 |
| Sulphur Dioxide | 2019 | 0.13333333333333333 | 15 |
| Sulphur Dioxide | 2020 | 0.3333333333333333 | 15 |
| Sulphur Dioxide | 2021 | 0 | 16 |
| Sulphur Dioxide | 2022 | 0.1 | 20 |
| Sulphur Dioxide | 2023 | 0.5294117647058824 | 17 |
| Sulphur Dioxide | 2024 | 0.47368421052631576 | 19 |
| Sulphur Dioxide | 2025 | 0 | 19 |