Statistical data set
Figure 9: Annual mean hours when PM2.5 pollution was 鈥楳oderate鈥� or higher for roadside 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 Traffic | 2009 | Moderate 4 | 112.75 | 4 |
| Urban Traffic | 2010 | Moderate 4 | 148.2727273 | 11 |
| Urban Traffic | 2011 | Moderate 4 | 234.8461538 | 13 |
| Urban Traffic | 2012 | Moderate 4 | 170.2 | 15 |
| Urban Traffic | 2013 | Moderate 4 | 135.4705882 | 17 |
| Urban Traffic | 2014 | Moderate 4 | 117.7857143 | 14 |
| Urban Traffic | 2015 | Moderate 4 | 77.78947368 | 19 |
| Urban Traffic | 2016 | Moderate 4 | 67.88235294 | 17 |
| Urban Traffic | 2017 | Moderate 4 | 68.88235294 | 17 |
| Urban Traffic | 2018 | Moderate 4 | 49.63157895 | 19 |
| Urban Traffic | 2019 | Moderate 4 | 73.73913043 | 23 |
| Urban Traffic | 2020 | Moderate 4 | 34.13636364 | 22 |
| Urban Traffic | 2021 | Moderate 4 | 17.9047619 | 21 |
| Urban Traffic | 2022 | Moderate 4 | 34.90909091 | 22 |
| Urban Traffic | 2023 | Moderate 4 | 15.69565217 | 23 |
| Urban Traffic | 2024 | Moderate 4 | 4.217391304 | 23 |
| Urban Traffic | 2009 | Moderate 5 | 65.5 | 4 |
| Urban Traffic | 2010 | Moderate 5 | 70.36363636 | 11 |
| Urban Traffic | 2011 | Moderate 5 | 150.4615385 | 13 |
| Urban Traffic | 2012 | Moderate 5 | 102.8666667 | 15 |
| Urban Traffic | 2013 | Moderate 5 | 81.64705882 | 17 |
| Urban Traffic | 2014 | Moderate 5 | 63.42857143 | 14 |
| Urban Traffic | 2015 | Moderate 5 | 47 | 19 |
| Urban Traffic | 2016 | Moderate 5 | 37.82352941 | 17 |
| Urban Traffic | 2017 | Moderate 5 | 48.05882353 | 17 |
| Urban Traffic | 2018 | Moderate 5 | 22.42105263 | 19 |
| Urban Traffic | 2019 | Moderate 5 | 51.2173913 | 23 |
| Urban Traffic | 2020 | Moderate 5 | 11.81818182 | 22 |
| Urban Traffic | 2021 | Moderate 5 | 12.66666667 | 21 |
| Urban Traffic | 2022 | Moderate 5 | 13.09090909 | 22 |
| Urban Traffic | 2023 | Moderate 5 | 1.304347826 | 23 |
| Urban Traffic | 2024 | Moderate 5 | 2.043478261 | 23 |
| Urban Traffic | 2009 | Moderate 6 | 30.5 | 4 |
| Urban Traffic | 2010 | Moderate 6 | 50.63636364 | 11 |
| Urban Traffic | 2011 | Moderate 6 | 105.2307692 | 13 |
| Urban Traffic | 2012 | Moderate 6 | 51.8 | 15 |
| Urban Traffic | 2013 | Moderate 6 | 44.58823529 | 17 |
| Urban Traffic | 2014 | Moderate 6 | 41.57142857 | 14 |
| Urban Traffic | 2015 | Moderate 6 | 33.15789474 | 19 |
| Urban Traffic | 2016 | Moderate 6 | 21.82352941 | 17 |
| Urban Traffic | 2017 | Moderate 6 | 36.52941176 | 17 |
| Urban Traffic | 2018 | Moderate 6 | 12.47368421 | 19 |
| Urban Traffic | 2019 | Moderate 6 | 28.26086957 | 23 |
| Urban Traffic | 2020 | Moderate 6 | 6.090909091 | 22 |
| Urban Traffic | 2021 | Moderate 6 | 6.285714286 | 21 |
| Urban Traffic | 2022 | Moderate 6 | 8.090909091 | 22 |
| Urban Traffic | 2023 | Moderate 6 | 0 | 23 |
| Urban Traffic | 2024 | Moderate 6 | 1.913043478 | 23 |
| Urban Traffic | 2009 | High 7 | 10.25 | 4 |
| Urban Traffic | 2010 | High 7 | 30 | 11 |
| Urban Traffic | 2011 | High 7 | 55.76923077 | 13 |
| Urban Traffic | 2012 | High 7 | 28.8 | 15 |
| Urban Traffic | 2013 | High 7 | 22.17647059 | 17 |
| Urban Traffic | 2014 | High 7 | 22.92857143 | 14 |
| Urban Traffic | 2015 | High 7 | 16.94736842 | 19 |
| Urban Traffic | 2016 | High 7 | 11.47058824 | 17 |
| Urban Traffic | 2017 | High 7 | 10.82352941 | 17 |
| Urban Traffic | 2018 | High 7 | 5.894736842 | 19 |
| Urban Traffic | 2019 | High 7 | 9.347826087 | 23 |
| Urban Traffic | 2020 | High 7 | 3.227272727 | 22 |
| Urban Traffic | 2021 | High 7 | 1.952380952 | 21 |
| Urban Traffic | 2022 | High 7 | 4.818181818 | 22 |
| Urban Traffic | 2023 | High 7 | 0 | 23 |
| Urban Traffic | 2024 | High 7 | 0.782608696 | 23 |
| Urban Traffic | 2009 | High 8 | 0.5 | 4 |
| Urban Traffic | 2010 | High 8 | 13.36363636 | 11 |
| Urban Traffic | 2011 | High 8 | 42.15384615 | 13 |
| Urban Traffic | 2012 | High 8 | 20.06666667 | 15 |
| Urban Traffic | 2013 | High 8 | 14.52941176 | 17 |
| Urban Traffic | 2014 | High 8 | 21.57142857 | 14 |
| Urban Traffic | 2015 | High 8 | 9.684210526 | 19 |
| Urban Traffic | 2016 | High 8 | 6.882352941 | 17 |
| Urban Traffic | 2017 | High 8 | 3.647058824 | 17 |
| Urban Traffic | 2018 | High 8 | 3.842105263 | 19 |
| Urban Traffic | 2019 | High 8 | 4.913043478 | 23 |
| Urban Traffic | 2020 | High 8 | 4.409090909 | 22 |
| Urban Traffic | 2021 | High 8 | 0.285714286 | 21 |
| Urban Traffic | 2022 | High 8 | 4.363636364 | 22 |
| Urban Traffic | 2023 | High 8 | 0 | 23 |
| Urban Traffic | 2024 | High 8 | 0.826086957 | 23 |
| Urban Traffic | 2009 | High 10 | 0 | 4 |
| Urban Traffic | 2010 | High 10 | 6.272727273 | 11 |
| Urban Traffic | 2011 | High 10 | 17.61538462 | 13 |
| Urban Traffic | 2012 | High 10 | 12.73333333 | 15 |
| Urban Traffic | 2013 | High 10 | 7.411764706 | 17 |
| Urban Traffic | 2014 | High 10 | 12 | 14 |
| Urban Traffic | 2015 | High 10 | 0.842105263 | 19 |
| Urban Traffic | 2016 | High 10 | 4.470588235 | 17 |
| Urban Traffic | 2017 | High 10 | 1.823529412 | 17 |
| Urban Traffic | 2018 | High 10 | 0.947368421 | 19 |
| Urban Traffic | 2019 | High 10 | 0.608695652 | 23 |
| Urban Traffic | 2020 | High 10 | 2.727272727 | 22 |
| Urban Traffic | 2021 | High 10 | 0 | 21 |
| Urban Traffic | 2022 | High 10 | 2 | 22 |
| Urban Traffic | 2023 | High 10 | 0 | 23 |
| Urban Traffic | 2024 | High 10 | 0.173913043 | 23 |
| Urban Traffic | 2009 | Very High 10 | 0 | 4 |
| Urban Traffic | 2010 | Very High 10 | 8.181818182 | 11 |
| Urban Traffic | 2011 | Very High 10 | 20.23076923 | 13 |
| Urban Traffic | 2012 | Very High 10 | 6.666666667 | 15 |
| Urban Traffic | 2013 | Very High 10 | 4.470588235 | 17 |
| Urban Traffic | 2014 | Very High 10 | 8.357142857 | 14 |
| Urban Traffic | 2015 | Very High 10 | 0 | 19 |
| Urban Traffic | 2016 | Very High 10 | 3.764705882 | 17 |
| Urban Traffic | 2017 | Very High 10 | 7.647058824 | 17 |
| Urban Traffic | 2018 | Very High 10 | 3.842105263 | 19 |
| Urban Traffic | 2019 | Very High 10 | 0.826086957 | 23 |
| Urban Traffic | 2020 | Very High 10 | 2.545454545 | 22 |
| Urban Traffic | 2021 | Very High 10 | 0 | 21 |
| Urban Traffic | 2022 | Very High 10 | 0.909090909 | 22 |
| Urban Traffic | 2023 | Very High 10 | 0 | 23 |
| Urban Traffic | 2024 | Very High 10 | 0.608695652 | 23 |