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Statistical data set

Figure 7: Annual mean hours when PM10 pollution was 鈥楳oderate鈥� or higher, for roadside sites, 1997 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 1997 Moderate 4 577.25 4
Urban Traffic 1998 Moderate 4 460.4285714 7
Urban Traffic 1999 Moderate 4 432.1428571 7
Urban Traffic 2000 Moderate 4 461.8571429 7
Urban Traffic 2001 Moderate 4 404.7142857 7
Urban Traffic 2002 Moderate 4 416 7
Urban Traffic 2003 Moderate 4 625.1428571 7
Urban Traffic 2004 Moderate 4 455.5714286 7
Urban Traffic 2005 Moderate 4 455.2857143 7
Urban Traffic 2006 Moderate 4 577 7
Urban Traffic 2007 Moderate 4 431.5 6
Urban Traffic 2008 Moderate 4 158.4545455 11
Urban Traffic 2009 Moderate 4 104.0714286 14
Urban Traffic 2010 Moderate 4 120.3571429 14
Urban Traffic 2011 Moderate 4 224.3846154 13
Urban Traffic 2012 Moderate 4 125.25 16
Urban Traffic 2013 Moderate 4 108.4615385 13
Urban Traffic 2014 Moderate 4 96.69230769 13
Urban Traffic 2015 Moderate 4 72.05555556 18
Urban Traffic 2016 Moderate 4 58.69565217 23
Urban Traffic 2017 Moderate 4 62.59259259 27
Urban Traffic 2018 Moderate 4 42.23333333 30
Urban Traffic 2019 Moderate 4 81.02702703 37
Urban Traffic 2020 Moderate 4 23.54285714 35
Urban Traffic 2021 Moderate 4 28.57575758 33
Urban Traffic 2022 Moderate 4 48.97142857 35
Urban Traffic 2023 Moderate 4 26.63888889 36
Urban Traffic 2024 Moderate 4 14.41666667 36
Urban Traffic 1997 Moderate 5 305 4
Urban Traffic 1998 Moderate 5 255.8571429 7
Urban Traffic 1999 Moderate 5 224.2857143 7
Urban Traffic 2000 Moderate 5 259.8571429 7
Urban Traffic 2001 Moderate 5 183 7
Urban Traffic 2002 Moderate 5 191.1428571 7
Urban Traffic 2003 Moderate 5 403.5714286 7
Urban Traffic 2004 Moderate 5 196.2857143 7
Urban Traffic 2005 Moderate 5 225.5714286 7
Urban Traffic 2006 Moderate 5 334.5714286 7
Urban Traffic 2007 Moderate 5 243 6
Urban Traffic 2008 Moderate 5 71.81818182 11
Urban Traffic 2009 Moderate 5 57.35714286 14
Urban Traffic 2010 Moderate 5 59.57142857 14
Urban Traffic 2011 Moderate 5 115.6153846 13
Urban Traffic 2012 Moderate 5 74.1875 16
Urban Traffic 2013 Moderate 5 60 13
Urban Traffic 2014 Moderate 5 45.07692308 13
Urban Traffic 2015 Moderate 5 39.22222222 18
Urban Traffic 2016 Moderate 5 28.04347826 23
Urban Traffic 2017 Moderate 5 30.11111111 27
Urban Traffic 2018 Moderate 5 14.8 30
Urban Traffic 2019 Moderate 5 43.27027027 37
Urban Traffic 2020 Moderate 5 6.942857143 35
Urban Traffic 2021 Moderate 5 9.848484848 33
Urban Traffic 2022 Moderate 5 26.74285714 35
Urban Traffic 2023 Moderate 5 11 36
Urban Traffic 2024 Moderate 5 5.416666667 36
Urban Traffic 1997 Moderate 6 175.5 4
Urban Traffic 1998 Moderate 6 124.8571429 7
Urban Traffic 1999 Moderate 6 107 7
Urban Traffic 2000 Moderate 6 85.42857143 7
Urban Traffic 2001 Moderate 6 92.57142857 7
Urban Traffic 2002 Moderate 6 77.71428571 7
Urban Traffic 2003 Moderate 6 239 7
Urban Traffic 2004 Moderate 6 91.14285714 7
Urban Traffic 2005 Moderate 6 93.85714286 7
Urban Traffic 2006 Moderate 6 171.7142857 7
Urban Traffic 2007 Moderate 6 111.1666667 6
Urban Traffic 2008 Moderate 6 35.18181818 11
Urban Traffic 2009 Moderate 6 24.78571429 14
Urban Traffic 2010 Moderate 6 30.42857143 14
Urban Traffic 2011 Moderate 6 83.23076923 13
Urban Traffic 2012 Moderate 6 41.125 16
Urban Traffic 2013 Moderate 6 36.15384615 13
Urban Traffic 2014 Moderate 6 30.61538462 13
Urban Traffic 2015 Moderate 6 14.5 18
Urban Traffic 2016 Moderate 6 20.52173913 23
Urban Traffic 2017 Moderate 6 12.88888889 27
Urban Traffic 2018 Moderate 6 5.2 30
Urban Traffic 2019 Moderate 6 30.32432432 37
Urban Traffic 2020 Moderate 6 6.114285714 35
Urban Traffic 2021 Moderate 6 2.060606061 33
Urban Traffic 2022 Moderate 6 14.54285714 35
Urban Traffic 2023 Moderate 6 3.833333333 36
Urban Traffic 2024 Moderate 6 1.75 36
Urban Traffic 1997 High 7 126.75 4
Urban Traffic 1998 High 7 58.28571429 7
Urban Traffic 1999 High 7 30.42857143 7
Urban Traffic 2000 High 7 32.71428571 7
Urban Traffic 2001 High 7 44 7
Urban Traffic 2002 High 7 20.57142857 7
Urban Traffic 2003 High 7 130.5714286 7
Urban Traffic 2004 High 7 25.85714286 7
Urban Traffic 2005 High 7 37.85714286 7
Urban Traffic 2006 High 7 54.71428571 7
Urban Traffic 2007 High 7 55.5 6
Urban Traffic 2008 High 7 18.18181818 11
Urban Traffic 2009 High 7 7.285714286 14
Urban Traffic 2010 High 7 14 14
Urban Traffic 2011 High 7 37.23076923 13
Urban Traffic 2012 High 7 20 16
Urban Traffic 2013 High 7 10.30769231 13
Urban Traffic 2014 High 7 13.92307692 13
Urban Traffic 2015 High 7 1.111111111 18
Urban Traffic 2016 High 7 11.69565217 23
Urban Traffic 2017 High 7 3.481481481 27
Urban Traffic 2018 High 7 2 30
Urban Traffic 2019 High 7 6.162162162 37
Urban Traffic 2020 High 7 2.628571429 35
Urban Traffic 2021 High 7 0.363636364 33
Urban Traffic 2022 High 7 4.228571429 35
Urban Traffic 2023 High 7 0.722222222 36
Urban Traffic 2024 High 7 1.416666667 36
Urban Traffic 1997 High 8 69.25 4
Urban Traffic 1998 High 8 32.85714286 7
Urban Traffic 1999 High 8 14 7
Urban Traffic 2000 High 8 21.57142857 7
Urban Traffic 2001 High 8 27.57142857 7
Urban Traffic 2002 High 8 17 7
Urban Traffic 2003 High 8 62.42857143 7
Urban Traffic 2004 High 8 8.857142857 7
Urban Traffic 2005 High 8 13.85714286 7
Urban Traffic 2006 High 8 29.57142857 7
Urban Traffic 2007 High 8 38.16666667 6
Urban Traffic 2008 High 8 14.90909091 11
Urban Traffic 2009 High 8 2.5 14
Urban Traffic 2010 High 8 8.285714286 14
Urban Traffic 2011 High 8 18.84615385 13
Urban Traffic 2012 High 8 6.5625 16
Urban Traffic 2013 High 8 3.461538462 13
Urban Traffic 2014 High 8 6.923076923 13
Urban Traffic 2015 High 8 0.111111111 18
Urban Traffic 2016 High 8 4.913043478 23
Urban Traffic 2017 High 8 1.888888889 27
Urban Traffic 2018 High 8 0.666666667 30
Urban Traffic 2019 High 8 1.054054054 37
Urban Traffic 2020 High 8 2.114285714 35
Urban Traffic 2021 High 8 0.333333333 33
Urban Traffic 2022 High 8 2.857142857 35
Urban Traffic 2023 High 8 0 36
Urban Traffic 2024 High 8 0.666666667 36
Urban Traffic 1997 High 9 68.5 4
Urban Traffic 1998 High 9 13 7
Urban Traffic 1999 High 9 8.142857143 7
Urban Traffic 2000 High 9 6.857142857 7
Urban Traffic 2001 High 9 22.14285714 7
Urban Traffic 2002 High 9 7.428571429 7
Urban Traffic 2003 High 9 27.28571429 7
Urban Traffic 2004 High 9 1.714285714 7
Urban Traffic 2005 High 9 0.571428571 7
Urban Traffic 2006 High 9 18.14285714 7
Urban Traffic 2007 High 9 25 6
Urban Traffic 2008 High 9 8.545454545 11
Urban Traffic 2009 High 9 1.071428571 14
Urban Traffic 2010 High 9 4.5 14
Urban Traffic 2011 High 9 10.53846154 13
Urban Traffic 2012 High 9 2 16
Urban Traffic 2013 High 9 1.615384615 13
Urban Traffic 2014 High 9 3.230769231 13
Urban Traffic 2015 High 9 1 18
Urban Traffic 2016 High 9 1.869565217 23
Urban Traffic 2017 High 9 1.925925926 27
Urban Traffic 2018 High 9 0.066666667 30
Urban Traffic 2019 High 9 0 37
Urban Traffic 2020 High 9 0.285714286 35
Urban Traffic 2021 High 9 0 33
Urban Traffic 2022 High 9 1.057142857 35
Urban Traffic 2023 High 9 0 36
Urban Traffic 2024 High 9 0.083333333 36
Urban Traffic 1997 Very High 10 49.75 4
Urban Traffic 1998 Very High 10 30.14285714 7
Urban Traffic 1999 Very High 10 35.28571429 7
Urban Traffic 2000 Very High 10 8.714285714 7
Urban Traffic 2001 Very High 10 47.28571429 7
Urban Traffic 2002 Very High 10 10.42857143 7
Urban Traffic 2003 Very High 10 12.57142857 7
Urban Traffic 2004 Very High 10 0 7
Urban Traffic 2005 Very High 10 2.571428571 7
Urban Traffic 2006 Very High 10 11 7
Urban Traffic 2007 Very High 10 15.83333333 6
Urban Traffic 2008 Very High 10 2 11
Urban Traffic 2009 Very High 10 0 14
Urban Traffic 2010 Very High 10 8.357142857 14
Urban Traffic 2011 Very High 10 6.076923077 13
Urban Traffic 2012 Very High 10 0.9375 16
Urban Traffic 2013 Very High 10 0 13
Urban Traffic 2014 Very High 10 3.230769231 13
Urban Traffic 2015 Very High 10 1.333333333 18
Urban Traffic 2016 Very High 10 0 23
Urban Traffic 2017 Very High 10 3.407407407 27
Urban Traffic 2018 Very High 10 0 30
Urban Traffic 2019 Very High 10 0 37
Urban Traffic 2020 Very High 10 0.457142857 35
Urban Traffic 2021 Very High 10 0 33
Urban Traffic 2022 Very High 10 0.285714286 35
Urban Traffic 2023 Very High 10 0 36
Urban Traffic 2024 Very High 10 0 36