See more information about this guidance

Statistical data set

Figure 10: Annual mean hours when PM2.5 pollution was 鈥楳oderate鈥� or higher for urban background sites, 2009 to 2024

Updated 26 June 2025

锘縎ite type Year Daily Air Quality Index Mean number of hours per site Number of sites
Urban Background 2009 Moderate 4 120.78125 32
Urban Background 2010 Moderate 4 102.1935484 31
Urban Background 2011 Moderate 4 189.4 30
Urban Background 2012 Moderate 4 136.1290323 31
Urban Background 2013 Moderate 4 100.516129 31
Urban Background 2014 Moderate 4 97.13793103 29
Urban Background 2015 Moderate 4 67.57142857 35
Urban Background 2016 Moderate 4 56.54285714 35
Urban Background 2017 Moderate 4 57.02777778 36
Urban Background 2018 Moderate 4 31.32432432 37
Urban Background 2019 Moderate 4 86.70731707 41
Urban Background 2020 Moderate 4 24.14285714 42
Urban Background 2021 Moderate 4 17.25641026 39
Urban Background 2022 Moderate 4 39.58695652 46
Urban Background 2023 Moderate 4 12.23214286 56
Urban Background 2024 Moderate 4 5.85 60
Urban Background 2009 Moderate 5 66.28125 32
Urban Background 2010 Moderate 5 55.80645161 31
Urban Background 2011 Moderate 5 114.4666667 30
Urban Background 2012 Moderate 5 75.64516129 31
Urban Background 2013 Moderate 5 44.4516129 31
Urban Background 2014 Moderate 5 52.68965517 29
Urban Background 2015 Moderate 5 46.37142857 35
Urban Background 2016 Moderate 5 32.85714286 35
Urban Background 2017 Moderate 5 41.5 36
Urban Background 2018 Moderate 5 14.54054054 37
Urban Background 2019 Moderate 5 52.85365854 41
Urban Background 2020 Moderate 5 9.095238095 42
Urban Background 2021 Moderate 5 9.58974359 39
Urban Background 2022 Moderate 5 17.39130435 46
Urban Background 2023 Moderate 5 3.839285714 56
Urban Background 2024 Moderate 5 1.116666667 60
Urban Background 2009 Moderate 6 37.9375 32
Urban Background 2010 Moderate 6 27.83870968 31
Urban Background 2011 Moderate 6 67.86666667 30
Urban Background 2012 Moderate 6 49.03225806 31
Urban Background 2013 Moderate 6 32.67741935 31
Urban Background 2014 Moderate 6 31.5862069 29
Urban Background 2015 Moderate 6 31.68571429 35
Urban Background 2016 Moderate 6 16.51428571 35
Urban Background 2017 Moderate 6 26.83333333 36
Urban Background 2018 Moderate 6 8.189189189 37
Urban Background 2019 Moderate 6 24.26829268 41
Urban Background 2020 Moderate 6 5.261904762 42
Urban Background 2021 Moderate 6 4.461538462 39
Urban Background 2022 Moderate 6 7 46
Urban Background 2023 Moderate 6 1.464285714 56
Urban Background 2024 Moderate 6 0.7 60
Urban Background 2009 High 7 18.0625 32
Urban Background 2010 High 7 9.774193548 31
Urban Background 2011 High 7 34.13333333 30
Urban Background 2012 High 7 28.87096774 31
Urban Background 2013 High 7 20.19354839 31
Urban Background 2014 High 7 18.96551724 29
Urban Background 2015 High 7 13.94285714 35
Urban Background 2016 High 7 9.685714286 35
Urban Background 2017 High 7 7.972222222 36
Urban Background 2018 High 7 5.378378378 37
Urban Background 2019 High 7 7.585365854 41
Urban Background 2020 High 7 3.380952381 42
Urban Background 2021 High 7 0.615384615 39
Urban Background 2022 High 7 3.195652174 46
Urban Background 2023 High 7 0.267857143 56
Urban Background 2024 High 7 0.266666667 60
Urban Background 2009 High 8 9.65625 32
Urban Background 2010 High 8 6.290322581 31
Urban Background 2011 High 8 28.26666667 30
Urban Background 2012 High 8 20.06451613 31
Urban Background 2013 High 8 13.90322581 31
Urban Background 2014 High 8 17.13793103 29
Urban Background 2015 High 8 6.914285714 35
Urban Background 2016 High 8 5.628571429 35
Urban Background 2017 High 8 3.916666667 36
Urban Background 2018 High 8 4.918918919 37
Urban Background 2019 High 8 2.365853659 41
Urban Background 2020 High 8 2.047619048 42
Urban Background 2021 High 8 0.051282051 39
Urban Background 2022 High 8 2.804347826 46
Urban Background 2023 High 8 0.339285714 56
Urban Background 2024 High 8 0.35 60
Urban Background 2009 High 9 5.25 32
Urban Background 2010 High 9 3.096774194 31
Urban Background 2011 High 9 15.1 30
Urban Background 2012 High 9 11.61290323 31
Urban Background 2013 High 9 6.774193548 31
Urban Background 2014 High 9 7.137931034 29
Urban Background 2015 High 9 0.657142857 35
Urban Background 2016 High 9 2.857142857 35
Urban Background 2017 High 9 2.25 36
Urban Background 2018 High 9 0.918918919 37
Urban Background 2019 High 9 0.268292683 41
Urban Background 2020 High 9 1.642857143 42
Urban Background 2021 High 9 0.051282051 39
Urban Background 2022 High 9 0.760869565 46
Urban Background 2023 High 9 0.535714286 56
Urban Background 2024 High 9 0.133333333 60
Urban Background 2009 Very High 10 1.84375 32
Urban Background 2010 Very High 10 8.387096774 31
Urban Background 2011 Very High 10 14.73333333 30
Urban Background 2012 Very High 10 6.903225806 31
Urban Background 2013 Very High 10 4.322580645 31
Urban Background 2014 Very High 10 12.51724138 29
Urban Background 2015 Very High 10 0.742857143 35
Urban Background 2016 Very High 10 0.742857143 35
Urban Background 2017 Very High 10 6.861111111 36
Urban Background 2018 Very High 10 0.783783784 37
Urban Background 2019 Very High 10 0.170731707 41
Urban Background 2020 Very High 10 1.261904762 42
Urban Background 2021 Very High 10 0 39
Urban Background 2022 Very High 10 0.152173913 46
Urban Background 2023 Very High 10 0.178571429 56
Urban Background 2024 Very High 10 0 60