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Statistical data set

Figure 8: Annual mean hours per site when PM10 pollution was ‘Moderate’ or higher, for urban background sites, 1992 to 2023

Updated 30 April 2024
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Site Type Year Number of sites Daily Air Quality Index Mean number of hours per site
Urban Background 1992 2 mod_4 400.5
Urban Background 1993 5 mod_4 403.4
Urban Background 1994 13 mod_4 367.3076923
Urban Background 1995 13 mod_4 342.3076923
Urban Background 1996 16 mod_4 348.125
Urban Background 1997 26 mod_4 309.5
Urban Background 1998 33 mod_4 189.7272727
Urban Background 1999 33 mod_4 125.1818182
Urban Background 2000 34 mod_4 101.8235294
Urban Background 2001 43 mod_4 120.8139535
Urban Background 2002 39 mod_4 90.53846154
Urban Background 2003 38 mod_4 227.4473684
Urban Background 2004 39 mod_4 73.1025641
Urban Background 2005 36 mod_4 72.11111111
Urban Background 2006 39 mod_4 119.3589744
Urban Background 2007 32 mod_4 102.375
Urban Background 2008 28 mod_4 75.67857143
Urban Background 2009 21 mod_4 64.28571429
Urban Background 2010 19 mod_4 64.73684211
Urban Background 2011 24 mod_4 115.1666667
Urban Background 2012 25 mod_4 73.56
Urban Background 2013 20 mod_4 51.45
Urban Background 2014 23 mod_4 55.82608696
Urban Background 2015 23 mod_4 53.7826087
Urban Background 2016 22 mod_4 35.09090909
Urban Background 2017 24 mod_4 41.33333333
Urban Background 2018 22 mod_4 17.45454545
Urban Background 2019 26 mod_4 68.46153846
Urban Background 2020 40 mod_4 13.025
Urban Background 2021 38 mod_4 10.89473684
Urban Background 2022 44 mod_4 35.04545455
Urban Background 2023 53 mod_4 8.79245283
Urban Background 1992 2 mod_5 202.5
Urban Background 1993 5 mod_5 306
Urban Background 1994 13 mod_5 224.4615385
Urban Background 1995 13 mod_5 222.6923077
Urban Background 1996 16 mod_5 229.3125
Urban Background 1997 26 mod_5 150.3846154
Urban Background 1998 33 mod_5 84.96969697
Urban Background 1999 33 mod_5 45.12121212
Urban Background 2000 34 mod_5 40.76470588
Urban Background 2001 43 mod_5 54.44186047
Urban Background 2002 39 mod_5 42.82051282
Urban Background 2003 38 mod_5 127.5789474
Urban Background 2004 39 mod_5 21.48717949
Urban Background 2005 36 mod_5 25.19444444
Urban Background 2006 39 mod_5 51.56410256
Urban Background 2007 32 mod_5 57.0625
Urban Background 2008 28 mod_5 40
Urban Background 2009 21 mod_5 36.47619048
Urban Background 2010 19 mod_5 17.31578947
Urban Background 2011 24 mod_5 63.375
Urban Background 2012 25 mod_5 45.96
Urban Background 2013 20 mod_5 27.05
Urban Background 2014 23 mod_5 24.13043478
Urban Background 2015 23 mod_5 26.30434783
Urban Background 2016 22 mod_5 20.45454545
Urban Background 2017 24 mod_5 16.29166667
Urban Background 2018 22 mod_5 10.13636364
Urban Background 2019 26 mod_5 28.57692308
Urban Background 2020 40 mod_5 7.275
Urban Background 2021 38 mod_5 3.763157895
Urban Background 2022 44 mod_5 14.63636364
Urban Background 2023 53 mod_5 2.509433962
Urban Background 1992 2 mod_6 132
Urban Background 1993 5 mod_6 250.6
Urban Background 1994 13 mod_6 164.8461538
Urban Background 1995 13 mod_6 164.7692308
Urban Background 1996 16 mod_6 161
Urban Background 1997 26 mod_6 92.07692308
Urban Background 1998 33 mod_6 52.60606061
Urban Background 1999 33 mod_6 19.27272727
Urban Background 2000 34 mod_6 17.64705882
Urban Background 2001 43 mod_6 29.39534884
Urban Background 2002 39 mod_6 16.41025641
Urban Background 2003 38 mod_6 70.36842105
Urban Background 2004 39 mod_6 6.384615385
Urban Background 2005 36 mod_6 12.69444444
Urban Background 2006 39 mod_6 25.33333333
Urban Background 2007 32 mod_6 40.59375
Urban Background 2008 28 mod_6 27.21428571
Urban Background 2009 21 mod_6 15.0952381
Urban Background 2010 19 mod_6 9.947368421
Urban Background 2011 24 mod_6 37.75
Urban Background 2012 25 mod_6 20.48
Urban Background 2013 20 mod_6 18.7
Urban Background 2014 23 mod_6 14.82608696
Urban Background 2015 23 mod_6 7.47826087
Urban Background 2016 22 mod_6 12.04545455
Urban Background 2017 24 mod_6 6.916666667
Urban Background 2018 22 mod_6 5.454545455
Urban Background 2019 26 mod_6 13.88461538
Urban Background 2020 40 mod_6 3.8
Urban Background 2021 38 mod_6 0.447368421
Urban Background 2022 44 mod_6 9.840909091
Urban Background 2023 53 mod_6 0.754716981
Urban Background 1992 2 high_7 95
Urban Background 1993 5 high_7 119.4
Urban Background 1994 13 high_7 80.69230769
Urban Background 1995 13 high_7 66
Urban Background 1996 16 high_7 90.1875
Urban Background 1997 26 high_7 52.88461538
Urban Background 1998 33 high_7 23.72727273
Urban Background 1999 33 high_7 6.666666667
Urban Background 2000 34 high_7 8.882352941
Urban Background 2001 43 high_7 13.27906977
Urban Background 2002 39 high_7 4.333333333
Urban Background 2003 38 high_7 21.86842105
Urban Background 2004 39 high_7 2.717948718
Urban Background 2005 36 high_7 5.722222222
Urban Background 2006 39 high_7 9.358974359
Urban Background 2007 32 high_7 23.25
Urban Background 2008 28 high_7 13.10714286
Urban Background 2009 21 high_7 6.047619048
Urban Background 2010 19 high_7 4.263157895
Urban Background 2011 24 high_7 16.20833333
Urban Background 2012 25 high_7 6.6
Urban Background 2013 20 high_7 3.45
Urban Background 2014 23 high_7 8.130434783
Urban Background 2015 23 high_7 1
Urban Background 2016 22 high_7 4.363636364
Urban Background 2017 24 high_7 0.791666667
Urban Background 2018 22 high_7 1.181818182
Urban Background 2019 26 high_7 1.384615385
Urban Background 2020 40 high_7 1.975
Urban Background 2021 38 high_7 0
Urban Background 2022 44 high_7 3.295454545
Urban Background 2023 53 high_7 0.547169811
Urban Background 1992 2 high_8 98.5
Urban Background 1993 5 high_8 83.2
Urban Background 1994 13 high_8 51.23076923
Urban Background 1995 13 high_8 42.61538462
Urban Background 1996 16 high_8 63.375
Urban Background 1997 26 high_8 30.96153846
Urban Background 1998 33 high_8 11.60606061
Urban Background 1999 33 high_8 3.242424242
Urban Background 2000 34 high_8 3.647058824
Urban Background 2001 43 high_8 8.465116279
Urban Background 2002 39 high_8 1.974358974
Urban Background 2003 38 high_8 5.842105263
Urban Background 2004 39 high_8 2.076923077
Urban Background 2005 36 high_8 2.222222222
Urban Background 2006 39 high_8 6.128205128
Urban Background 2007 32 high_8 11.65625
Urban Background 2008 28 high_8 6.535714286
Urban Background 2009 21 high_8 3.285714286
Urban Background 2010 19 high_8 1.526315789
Urban Background 2011 24 high_8 8
Urban Background 2012 25 high_8 2.36
Urban Background 2013 20 high_8 0.95
Urban Background 2014 23 high_8 1.434782609
Urban Background 2015 23 high_8 0.391304348
Urban Background 2016 22 high_8 0.409090909
Urban Background 2017 24 high_8 0.375
Urban Background 2018 22 high_8 1.090909091
Urban Background 2019 26 high_8 0.5
Urban Background 2020 40 high_8 0.3
Urban Background 2021 38 high_8 0
Urban Background 2022 44 high_8 1.522727273
Urban Background 2023 53 high_8 0.132075472
Urban Background 1992 2 high_9 46
Urban Background 1993 5 high_9 66.8
Urban Background 1994 13 high_9 33.69230769
Urban Background 1995 13 high_9 20.07692308
Urban Background 1996 16 high_9 48.3125
Urban Background 1997 26 high_9 19.11538462
Urban Background 1998 33 high_9 7.03030303
Urban Background 1999 33 high_9 1.03030303
Urban Background 2000 34 high_9 2.470588235
Urban Background 2001 43 high_9 5.441860465
Urban Background 2002 39 high_9 1.846153846
Urban Background 2003 38 high_9 3.578947368
Urban Background 2004 39 high_9 0.58974359
Urban Background 2005 36 high_9 2.083333333
Urban Background 2006 39 high_9 4.615384615
Urban Background 2007 32 high_9 8.4375
Urban Background 2008 28 high_9 3.892857143
Urban Background 2009 21 high_9 0.619047619
Urban Background 2010 19 high_9 0.894736842
Urban Background 2011 24 high_9 3.791666667
Urban Background 2012 25 high_9 1.44
Urban Background 2013 20 high_9 0
Urban Background 2014 23 high_9 0.304347826
Urban Background 2015 23 high_9 0
Urban Background 2016 22 high_9 0.227272727
Urban Background 2017 24 high_9 0.75
Urban Background 2018 22 high_9 0.227272727
Urban Background 2019 26 high_9 0.730769231
Urban Background 2020 40 high_9 0.525
Urban Background 2021 38 high_9 0
Urban Background 2022 44 high_9 0.25
Urban Background 2023 53 high_9 0.037735849
Urban Background 1992 2 vhigh_10 171
Urban Background 1993 5 vhigh_10 69.4
Urban Background 1994 13 vhigh_10 48.15384615
Urban Background 1995 13 vhigh_10 26.46153846
Urban Background 1996 16 vhigh_10 79.625
Urban Background 1997 26 vhigh_10 26.11538462
Urban Background 1998 33 vhigh_10 9.363636364
Urban Background 1999 33 vhigh_10 2.666666667
Urban Background 2000 34 vhigh_10 3.705882353
Urban Background 2001 43 vhigh_10 12.6744186
Urban Background 2002 39 vhigh_10 3.846153846
Urban Background 2003 38 vhigh_10 4.736842105
Urban Background 2004 39 vhigh_10 2.256410256
Urban Background 2005 36 vhigh_10 5
Urban Background 2006 39 vhigh_10 5.769230769
Urban Background 2007 32 vhigh_10 10.1875
Urban Background 2008 28 vhigh_10 4.785714286
Urban Background 2009 21 vhigh_10 0
Urban Background 2010 19 vhigh_10 1.894736842
Urban Background 2011 24 vhigh_10 5.166666667
Urban Background 2012 25 vhigh_10 0
Urban Background 2013 20 vhigh_10 0
Urban Background 2014 23 vhigh_10 3.304347826
Urban Background 2015 23 vhigh_10 0
Urban Background 2016 22 vhigh_10 2.272727273
Urban Background 2017 24 vhigh_10 0.916666667
Urban Background 2018 22 vhigh_10 0
Urban Background 2019 26 vhigh_10 1.230769231
Urban Background 2020 40 vhigh_10 0.825
Urban Background 2021 38 vhigh_10 0
Urban Background 2022 44 vhigh_10 0
Urban Background 2023 53 vhigh_10 0.320754717