Statistical data set
Figure 9: Annual mean hours when PM2.5 pollution was 鈥楳oderate鈥� or higher for roadside sites, 2009 to 2025
Updated 30 June 2026
| Site type | Year | Number of sites | Daily Air Quality Index | Mean number of hours per site |
|---|---|---|---|---|
| Urban Traffic | 2009 | 4 | mod_4 | 112.75 |
| Urban Traffic | 2010 | 11 | mod_4 | 148.27272727272728 |
| Urban Traffic | 2011 | 13 | mod_4 | 234.84615384615384 |
| Urban Traffic | 2012 | 15 | mod_4 | 170.2 |
| Urban Traffic | 2013 | 17 | mod_4 | 135.47058823529412 |
| Urban Traffic | 2014 | 14 | mod_4 | 117.78571428571429 |
| Urban Traffic | 2015 | 19 | mod_4 | 77.78947368421052 |
| Urban Traffic | 2016 | 17 | mod_4 | 67.88235294117646 |
| Urban Traffic | 2017 | 17 | mod_4 | 68.88235294117646 |
| Urban Traffic | 2018 | 19 | mod_4 | 49.63157894736842 |
| Urban Traffic | 2019 | 23 | mod_4 | 73.73913043478261 |
| Urban Traffic | 2020 | 22 | mod_4 | 34.13636363636363 |
| Urban Traffic | 2021 | 21 | mod_4 | 17.904761904761905 |
| Urban Traffic | 2022 | 22 | mod_4 | 34.90909090909091 |
| Urban Traffic | 2023 | 23 | mod_4 | 15.695652173913043 |
| Urban Traffic | 2024 | 23 | mod_4 | 4.217391304347826 |
| Urban Traffic | 2025 | 45 | mod_4 | 29.466666666666665 |
| Urban Traffic | 2009 | 4 | mod_5 | 65.5 |
| Urban Traffic | 2010 | 11 | mod_5 | 70.36363636363636 |
| Urban Traffic | 2011 | 13 | mod_5 | 150.46153846153845 |
| Urban Traffic | 2012 | 15 | mod_5 | 102.86666666666666 |
| Urban Traffic | 2013 | 17 | mod_5 | 81.6470588235294 |
| Urban Traffic | 2014 | 14 | mod_5 | 63.42857142857143 |
| Urban Traffic | 2015 | 19 | mod_5 | 47 |
| Urban Traffic | 2016 | 17 | mod_5 | 37.8235294117647 |
| Urban Traffic | 2017 | 17 | mod_5 | 48.05882352941177 |
| Urban Traffic | 2018 | 19 | mod_5 | 22.42105263157895 |
| Urban Traffic | 2019 | 23 | mod_5 | 51.21739130434783 |
| Urban Traffic | 2020 | 22 | mod_5 | 11.818181818181818 |
| Urban Traffic | 2021 | 21 | mod_5 | 12.666666666666666 |
| Urban Traffic | 2022 | 22 | mod_5 | 13.090909090909092 |
| Urban Traffic | 2023 | 23 | mod_5 | 1.3043478260869565 |
| Urban Traffic | 2024 | 23 | mod_5 | 2.0434782608695654 |
| Urban Traffic | 2025 | 45 | mod_5 | 13.11111111111111 |
| Urban Traffic | 2009 | 4 | mod_6 | 30.5 |
| Urban Traffic | 2010 | 11 | mod_6 | 50.63636363636363 |
| Urban Traffic | 2011 | 13 | mod_6 | 105.23076923076923 |
| Urban Traffic | 2012 | 15 | mod_6 | 51.8 |
| Urban Traffic | 2013 | 17 | mod_6 | 44.588235294117645 |
| Urban Traffic | 2014 | 14 | mod_6 | 41.57142857142857 |
| Urban Traffic | 2015 | 19 | mod_6 | 33.1578947368421 |
| Urban Traffic | 2016 | 17 | mod_6 | 21.823529411764707 |
| Urban Traffic | 2017 | 17 | mod_6 | 36.529411764705884 |
| Urban Traffic | 2018 | 19 | mod_6 | 12.473684210526315 |
| Urban Traffic | 2019 | 23 | mod_6 | 28.26086956521739 |
| Urban Traffic | 2020 | 22 | mod_6 | 6.090909090909091 |
| Urban Traffic | 2021 | 21 | mod_6 | 6.285714285714286 |
| Urban Traffic | 2022 | 22 | mod_6 | 8.090909090909092 |
| Urban Traffic | 2023 | 23 | mod_6 | 0 |
| Urban Traffic | 2024 | 23 | mod_6 | 1.9130434782608696 |
| Urban Traffic | 2025 | 45 | mod_6 | 5.844444444444444 |
| Urban Traffic | 2009 | 4 | high_7 | 10.25 |
| Urban Traffic | 2010 | 11 | high_7 | 30 |
| Urban Traffic | 2011 | 13 | high_7 | 55.76923076923077 |
| Urban Traffic | 2012 | 15 | high_7 | 28.8 |
| Urban Traffic | 2013 | 17 | high_7 | 22.176470588235293 |
| Urban Traffic | 2014 | 14 | high_7 | 22.928571428571427 |
| Urban Traffic | 2015 | 19 | high_7 | 16.94736842105263 |
| Urban Traffic | 2016 | 17 | high_7 | 11.470588235294118 |
| Urban Traffic | 2017 | 17 | high_7 | 10.823529411764707 |
| Urban Traffic | 2018 | 19 | high_7 | 5.894736842105263 |
| Urban Traffic | 2019 | 23 | high_7 | 9.347826086956522 |
| Urban Traffic | 2020 | 22 | high_7 | 3.227272727272727 |
| Urban Traffic | 2021 | 21 | high_7 | 1.9523809523809523 |
| Urban Traffic | 2022 | 22 | high_7 | 4.818181818181818 |
| Urban Traffic | 2023 | 23 | high_7 | 0 |
| Urban Traffic | 2024 | 23 | high_7 | 0.782608695652174 |
| Urban Traffic | 2025 | 45 | high_7 | 1.5555555555555556 |
| Urban Traffic | 2009 | 4 | high_8 | 0.5 |
| Urban Traffic | 2010 | 11 | high_8 | 13.363636363636363 |
| Urban Traffic | 2011 | 13 | high_8 | 42.15384615384615 |
| Urban Traffic | 2012 | 15 | high_8 | 20.066666666666666 |
| Urban Traffic | 2013 | 17 | high_8 | 14.529411764705882 |
| Urban Traffic | 2014 | 14 | high_8 | 21.571428571428573 |
| Urban Traffic | 2015 | 19 | high_8 | 9.68421052631579 |
| Urban Traffic | 2016 | 17 | high_8 | 6.882352941176471 |
| Urban Traffic | 2017 | 17 | high_8 | 3.6470588235294117 |
| Urban Traffic | 2018 | 19 | high_8 | 3.8421052631578947 |
| Urban Traffic | 2019 | 23 | high_8 | 4.913043478260869 |
| Urban Traffic | 2020 | 22 | high_8 | 4.409090909090909 |
| Urban Traffic | 2021 | 21 | high_8 | 0.2857142857142857 |
| Urban Traffic | 2022 | 22 | high_8 | 4.363636363636363 |
| Urban Traffic | 2023 | 23 | high_8 | 0 |
| Urban Traffic | 2024 | 23 | high_8 | 0.8260869565217391 |
| Urban Traffic | 2025 | 45 | high_8 | 1.8888888888888888 |
| Urban Traffic | 2009 | 4 | high_9 | 0 |
| Urban Traffic | 2010 | 11 | high_9 | 6.2727272727272725 |
| Urban Traffic | 2011 | 13 | high_9 | 17.615384615384617 |
| Urban Traffic | 2012 | 15 | high_9 | 12.733333333333333 |
| Urban Traffic | 2013 | 17 | high_9 | 7.411764705882353 |
| Urban Traffic | 2014 | 14 | high_9 | 12 |
| Urban Traffic | 2015 | 19 | high_9 | 0.8421052631578947 |
| Urban Traffic | 2016 | 17 | high_9 | 4.470588235294118 |
| Urban Traffic | 2017 | 17 | high_9 | 1.8235294117647058 |
| Urban Traffic | 2018 | 19 | high_9 | 0.9473684210526315 |
| Urban Traffic | 2019 | 23 | high_9 | 0.6086956521739131 |
| Urban Traffic | 2020 | 22 | high_9 | 2.727272727272727 |
| Urban Traffic | 2021 | 21 | high_9 | 0 |
| Urban Traffic | 2022 | 22 | high_9 | 2 |
| Urban Traffic | 2023 | 23 | high_9 | 0 |
| Urban Traffic | 2024 | 23 | high_9 | 0.17391304347826086 |
| Urban Traffic | 2025 | 45 | high_9 | 0.7111111111111111 |
| Urban Traffic | 2009 | 4 | vhigh_10 | 0 |
| Urban Traffic | 2010 | 11 | vhigh_10 | 8.181818181818182 |
| Urban Traffic | 2011 | 13 | vhigh_10 | 20.23076923076923 |
| Urban Traffic | 2012 | 15 | vhigh_10 | 6.666666666666667 |
| Urban Traffic | 2013 | 17 | vhigh_10 | 4.470588235294118 |
| Urban Traffic | 2014 | 14 | vhigh_10 | 8.357142857142858 |
| Urban Traffic | 2015 | 19 | vhigh_10 | 0 |
| Urban Traffic | 2016 | 17 | vhigh_10 | 3.764705882352941 |
| Urban Traffic | 2017 | 17 | vhigh_10 | 7.647058823529412 |
| Urban Traffic | 2018 | 19 | vhigh_10 | 3.8421052631578947 |
| Urban Traffic | 2019 | 23 | vhigh_10 | 0.8260869565217391 |
| Urban Traffic | 2020 | 22 | vhigh_10 | 2.5454545454545454 |
| Urban Traffic | 2021 | 21 | vhigh_10 | 0 |
| Urban Traffic | 2022 | 22 | vhigh_10 | 0.9090909090909091 |
| Urban Traffic | 2023 | 23 | vhigh_10 | 0 |
| Urban Traffic | 2024 | 23 | vhigh_10 | 0.6086956521739131 |
| Urban Traffic | 2025 | 45 | vhigh_10 | 0.8 |