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Statistical data set

Figure 2: Mean hours when NO2 pollution was moderate or higher for roadside sites, 1997 to 2023

Updated 30 April 2024
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Year Site type Number of sites Daily Air Quality Index Mean numbers of hours per site
1997 Urban Traffic 7 4 Moderate 14.85714286
1998 Urban Traffic 15 4 Moderate 13.4
1999 Urban Traffic 17 4 Moderate 9.588235294
2000 Urban Traffic 19 4 Moderate 7.842105263
2001 Urban Traffic 21 4 Moderate 5.142857143
2002 Urban Traffic 21 4 Moderate 2
2003 Urban Traffic 20 4 Moderate 25.4
2004 Urban Traffic 22 4 Moderate 24.95454545
2005 Urban Traffic 22 4 Moderate 38.04545455
2006 Urban Traffic 21 4 Moderate 34.76190476
2007 Urban Traffic 18 4 Moderate 34.38888889
2008 Urban Traffic 24 4 Moderate 38.20833333
2009 Urban Traffic 27 4 Moderate 20.96296296
2010 Urban Traffic 30 4 Moderate 25.7
2011 Urban Traffic 31 4 Moderate 12.61290323
2012 Urban Traffic 29 4 Moderate 9.103448276
2013 Urban Traffic 32 4 Moderate 4.65625
2014 Urban Traffic 28 4 Moderate 3.928571429
2015 Urban Traffic 38 4 Moderate 4.868421053
2016 Urban Traffic 50 4 Moderate 5.22
2017 Urban Traffic 61 4 Moderate 2.786885246
2018 Urban Traffic 63 4 Moderate 1.444444444
2019 Urban Traffic 66 4 Moderate 0.772727273
2020 Urban Traffic 65 4 Moderate 0.138461538
2021 Urban Traffic 62 4 Moderate 0.080645161
2022 Urban Traffic 65 4 Moderate 0.046153846
2023 Urban Traffic 61 4 Moderate 0.016393443
1997 Urban Traffic 7 5 Moderate 2.571428571
1998 Urban Traffic 15 5 Moderate 0.666666667
1999 Urban Traffic 17 5 Moderate 0.470588235
2000 Urban Traffic 19 5 Moderate 0.263157895
2001 Urban Traffic 21 5 Moderate 1.047619048
2002 Urban Traffic 21 5 Moderate 0.80952381
2003 Urban Traffic 20 5 Moderate 2.55
2004 Urban Traffic 22 5 Moderate 1.409090909
2005 Urban Traffic 22 5 Moderate 5.090909091
2006 Urban Traffic 21 5 Moderate 3.047619048
2007 Urban Traffic 18 5 Moderate 3.555555556
2008 Urban Traffic 24 5 Moderate 3.791666667
2009 Urban Traffic 27 5 Moderate 0.481481481
2010 Urban Traffic 30 5 Moderate 1.766666667
2011 Urban Traffic 31 5 Moderate 0.387096774
2012 Urban Traffic 29 5 Moderate 0.103448276
2013 Urban Traffic 32 5 Moderate 0.21875
2014 Urban Traffic 28 5 Moderate 0.142857143
2015 Urban Traffic 38 5 Moderate 0.289473684
2016 Urban Traffic 50 5 Moderate 0.52
2017 Urban Traffic 61 5 Moderate 0.475409836
2018 Urban Traffic 63 5 Moderate 0.047619048
2019 Urban Traffic 66 5 Moderate 0
2020 Urban Traffic 65 5 Moderate 0.030769231
2021 Urban Traffic 62 5 Moderate 0
2022 Urban Traffic 65 5 Moderate 0
2023 Urban Traffic 61 5 Moderate 0
1997 Urban Traffic 7 6 Moderate 0.571428571
1998 Urban Traffic 15 6 Moderate 0.066666667
1999 Urban Traffic 17 6 Moderate 0.058823529
2000 Urban Traffic 19 6 Moderate 0.105263158
2001 Urban Traffic 21 6 Moderate 0.238095238
2002 Urban Traffic 21 6 Moderate 0.047619048
2003 Urban Traffic 20 6 Moderate 0.15
2004 Urban Traffic 22 6 Moderate 0.136363636
2005 Urban Traffic 22 6 Moderate 0.363636364
2006 Urban Traffic 21 6 Moderate 0.142857143
2007 Urban Traffic 18 6 Moderate 0.277777778
2008 Urban Traffic 24 6 Moderate 0.458333333
2009 Urban Traffic 27 6 Moderate 0.037037037
2010 Urban Traffic 30 6 Moderate 0.2
2011 Urban Traffic 31 6 Moderate 0.032258065
2012 Urban Traffic 29 6 Moderate 0
2013 Urban Traffic 32 6 Moderate 0.09375
2014 Urban Traffic 28 6 Moderate 0
2015 Urban Traffic 38 6 Moderate 0.026315789
2016 Urban Traffic 50 6 Moderate 0.08
2017 Urban Traffic 61 6 Moderate 0.06557377
2018 Urban Traffic 63 6 Moderate 0.015873016
2019 Urban Traffic 66 6 Moderate 0
2020 Urban Traffic 65 6 Moderate 0
2021 Urban Traffic 62 6 Moderate 0
2022 Urban Traffic 65 6 Moderate 0
2023 Urban Traffic 61 6 Moderate 0
1997 Urban Traffic 7 7 High 0.142857143
1998 Urban Traffic 15 7 High 0
1999 Urban Traffic 17 7 High 0
2000 Urban Traffic 19 7 High 0
2001 Urban Traffic 21 7 High 0.047619048
2002 Urban Traffic 21 7 High 0
2003 Urban Traffic 20 7 High 0.05
2004 Urban Traffic 22 7 High 0.045454545
2005 Urban Traffic 22 7 High 0.045454545
2006 Urban Traffic 21 7 High 0.047619048
2007 Urban Traffic 18 7 High 0
2008 Urban Traffic 24 7 High 0
2009 Urban Traffic 27 7 High 0
2010 Urban Traffic 30 7 High 0
2011 Urban Traffic 31 7 High 0
2012 Urban Traffic 29 7 High 0
2013 Urban Traffic 32 7 High 0
2014 Urban Traffic 28 7 High 0.035714286
2015 Urban Traffic 38 7 High 0
2016 Urban Traffic 50 7 High 0
2017 Urban Traffic 61 7 High 0
2018 Urban Traffic 63 7 High 0
2019 Urban Traffic 66 7 High 0
2020 Urban Traffic 65 7 High 0
2021 Urban Traffic 62 7 High 0
2022 Urban Traffic 65 7 High 0
2023 Urban Traffic 61 7 High 0
1997 Urban Traffic 7 8 High 0
1998 Urban Traffic 15 8 High 0
1999 Urban Traffic 17 8 High 0
2000 Urban Traffic 19 8 High 0
2001 Urban Traffic 21 8 High 0
2002 Urban Traffic 21 8 High 0
2003 Urban Traffic 20 8 High 0.05
2004 Urban Traffic 22 8 High 0
2005 Urban Traffic 22 8 High 0.045454545
2006 Urban Traffic 21 8 High 0
2007 Urban Traffic 18 8 High 0
2008 Urban Traffic 24 8 High 0
2009 Urban Traffic 27 8 High 0
2010 Urban Traffic 30 8 High 0
2011 Urban Traffic 31 8 High 0
2012 Urban Traffic 29 8 High 0
2013 Urban Traffic 32 8 High 0
2014 Urban Traffic 28 8 High 0
2015 Urban Traffic 38 8 High 0
2016 Urban Traffic 50 8 High 0
2017 Urban Traffic 61 8 High 0
2018 Urban Traffic 63 8 High 0
2019 Urban Traffic 66 8 High 0
2020 Urban Traffic 65 8 High 0
2021 Urban Traffic 62 8 High 0
2022 Urban Traffic 65 8 High 0
2023 Urban Traffic 61 8 High 0
1997 Urban Traffic 7 9 High 0
1998 Urban Traffic 15 9 High 0
1999 Urban Traffic 17 9 High 0
2000 Urban Traffic 19 9 High 0
2001 Urban Traffic 21 9 High 0
2002 Urban Traffic 21 9 High 0
2003 Urban Traffic 20 9 High 0
2004 Urban Traffic 22 9 High 0
2005 Urban Traffic 22 9 High 0
2006 Urban Traffic 21 9 High 0
2007 Urban Traffic 18 9 High 0
2008 Urban Traffic 24 9 High 0
2009 Urban Traffic 27 9 High 0
2010 Urban Traffic 30 9 High 0
2011 Urban Traffic 31 9 High 0
2012 Urban Traffic 29 9 High 0
2013 Urban Traffic 32 9 High 0
2014 Urban Traffic 28 9 High 0
2015 Urban Traffic 38 9 High 0
2016 Urban Traffic 50 9 High 0
2017 Urban Traffic 61 9 High 0
2018 Urban Traffic 63 9 High 0
2019 Urban Traffic 66 9 High 0
2020 Urban Traffic 65 9 High 0
2021 Urban Traffic 62 9 High 0
2022 Urban Traffic 65 9 High 0
2023 Urban Traffic 61 9 High 0
1997 Urban Traffic 7 10 Very High 0
1998 Urban Traffic 15 10 Very High 0
1999 Urban Traffic 17 10 Very High 0
2000 Urban Traffic 19 10 Very High 0
2001 Urban Traffic 21 10 Very High 0
2002 Urban Traffic 21 10 Very High 0
2003 Urban Traffic 20 10 Very High 0
2004 Urban Traffic 22 10 Very High 0
2005 Urban Traffic 22 10 Very High 0
2006 Urban Traffic 21 10 Very High 0
2007 Urban Traffic 18 10 Very High 0
2008 Urban Traffic 24 10 Very High 0
2009 Urban Traffic 27 10 Very High 0
2010 Urban Traffic 30 10 Very High 0
2011 Urban Traffic 31 10 Very High 0
2012 Urban Traffic 29 10 Very High 0
2013 Urban Traffic 32 10 Very High 0
2014 Urban Traffic 28 10 Very High 0
2015 Urban Traffic 38 10 Very High 0
2016 Urban Traffic 50 10 Very High 0
2017 Urban Traffic 61 10 Very High 0
2018 Urban Traffic 63 10 Very High 0
2019 Urban Traffic 66 10 Very High 0
2020 Urban Traffic 65 10 Very High 0
2021 Urban Traffic 62 10 Very High 0
2022 Urban Traffic 65 10 Very High 0
2023 Urban Traffic 61 10 Very High 0