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Statistical data set

Figure 8: Annual mean hours per site when PM10 pollution was 鈥楳oderate鈥� or higher, for urban background sites, 1992 to 2025

Updated 30 June 2026

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_4 367.3076923076923
Urban Background 1995 13 mod_4 342.3076923076923
Urban Background 1996 16 mod_4 348.125
Urban Background 1997 26 mod_4 309.5
Urban Background 1998 33 mod_4 189.72727272727272
Urban Background 1999 33 mod_4 125.18181818181819
Urban Background 2000 34 mod_4 101.82352941176471
Urban Background 2001 43 mod_4 120.81395348837209
Urban Background 2002 39 mod_4 90.53846153846153
Urban Background 2003 38 mod_4 227.44736842105263
Urban Background 2004 39 mod_4 73.1025641025641
Urban Background 2005 36 mod_4 72.11111111111111
Urban Background 2006 39 mod_4 119.35897435897436
Urban Background 2007 32 mod_4 102.375
Urban Background 2008 28 mod_4 75.67857142857143
Urban Background 2009 21 mod_4 64.28571428571429
Urban Background 2010 19 mod_4 64.73684210526316
Urban Background 2011 24 mod_4 115.16666666666667
Urban Background 2012 25 mod_4 73.56
Urban Background 2013 20 mod_4 51.45
Urban Background 2014 23 mod_4 55.82608695652174
Urban Background 2015 23 mod_4 53.78260869565217
Urban Background 2016 22 mod_4 35.09090909090909
Urban Background 2017 24 mod_4 41.333333333333336
Urban Background 2018 22 mod_4 17.454545454545453
Urban Background 2019 26 mod_4 68.46153846153847
Urban Background 2020 40 mod_4 13.025
Urban Background 2021 38 mod_4 10.894736842105264
Urban Background 2022 44 mod_4 35.04545454545455
Urban Background 2023 53 mod_4 8.79245283018868
Urban Background 2024 57 mod_4 6.684210526315789
Urban Background 2025 69 mod_4 19.695652173913043
Urban Background 1992 2 mod_5 202.5
Urban Background 1993 5 mod_5 306
Urban Background 1994 13 mod_5 224.46153846153845
Urban Background 1995 13 mod_5 222.69230769230768
Urban Background 1996 16 mod_5 229.3125
Urban Background 1997 26 mod_5 150.3846153846154
Urban Background 1998 33 mod_5 84.96969696969697
Urban Background 1999 33 mod_5 45.121212121212125
Urban Background 2000 34 mod_5 40.76470588235294
Urban Background 2001 43 mod_5 54.44186046511628
Urban Background 2002 39 mod_5 42.82051282051282
Urban Background 2003 38 mod_5 127.57894736842105
Urban Background 2004 39 mod_5 21.487179487179485
Urban Background 2005 36 mod_5 25.194444444444443
Urban Background 2006 39 mod_5 51.56410256410256
Urban Background 2007 32 mod_5 57.0625
Urban Background 2008 28 mod_5 40
Urban Background 2009 21 mod_5 36.476190476190474
Urban Background 2010 19 mod_5 17.31578947368421
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 24.130434782608695
Urban Background 2015 23 mod_5 26.304347826086957
Urban Background 2016 22 mod_5 20.454545454545453
Urban Background 2017 24 mod_5 16.291666666666668
Urban Background 2018 22 mod_5 10.136363636363637
Urban Background 2019 26 mod_5 28.576923076923077
Urban Background 2020 40 mod_5 7.275
Urban Background 2021 38 mod_5 3.763157894736842
Urban Background 2022 44 mod_5 14.636363636363637
Urban Background 2023 53 mod_5 2.509433962264151
Urban Background 2024 57 mod_5 2.719298245614035
Urban Background 2025 69 mod_5 7.826086956521739
Urban Background 1992 2 mod_6 132
Urban Background 1993 5 mod_6 250.6
Urban Background 1994 13 mod_6 164.84615384615384
Urban Background 1995 13 mod_6 164.76923076923077
Urban Background 1996 16 mod_6 161
Urban Background 1997 26 mod_6 92.07692307692308
Urban Background 1998 33 mod_6 52.60606060606061
Urban Background 1999 33 mod_6 19.272727272727273
Urban Background 2000 34 mod_6 17.647058823529413
Urban Background 2001 43 mod_6 29.3953488372093
Urban Background 2002 39 mod_6 16.41025641025641
Urban Background 2003 38 mod_6 70.36842105263158
Urban Background 2004 39 mod_6 6.384615384615385
Urban Background 2005 36 mod_6 12.694444444444445
Urban Background 2006 39 mod_6 25.333333333333332
Urban Background 2007 32 mod_6 40.59375
Urban Background 2008 28 mod_6 27.214285714285715
Urban Background 2009 21 mod_6 15.095238095238095
Urban Background 2010 19 mod_6 9.947368421052632
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 14.826086956521738
Urban Background 2015 23 mod_6 7.478260869565218
Urban Background 2016 22 mod_6 12.045454545454545
Urban Background 2017 24 mod_6 6.916666666666667
Urban Background 2018 22 mod_6 5.454545454545454
Urban Background 2019 26 mod_6 13.884615384615385
Urban Background 2020 40 mod_6 3.8
Urban Background 2021 38 mod_6 0.4473684210526316
Urban Background 2022 44 mod_6 9.840909090909092
Urban Background 2023 53 mod_6 0.7547169811320755
Urban Background 2024 57 mod_6 1.2105263157894737
Urban Background 2025 69 mod_6 2.9130434782608696
Urban Background 1992 2 high_7 95
Urban Background 1993 5 high_7 119.4
Urban Background 1994 13 high_7 80.6923076923077
Urban Background 1995 13 high_7 66
Urban Background 1996 16 high_7 90.1875
Urban Background 1997 26 high_7 52.88461538461539
Urban Background 1998 33 high_7 23.727272727272727
Urban Background 1999 33 high_7 6.666666666666667
Urban Background 2000 34 high_7 8.882352941176471
Urban Background 2001 43 high_7 13.279069767441861
Urban Background 2002 39 high_7 4.333333333333333
Urban Background 2003 38 high_7 21.86842105263158
Urban Background 2004 39 high_7 2.717948717948718
Urban Background 2005 36 high_7 5.722222222222222
Urban Background 2006 39 high_7 9.35897435897436
Urban Background 2007 32 high_7 23.25
Urban Background 2008 28 high_7 13.107142857142858
Urban Background 2009 21 high_7 6.0476190476190474
Urban Background 2010 19 high_7 4.2631578947368425
Urban Background 2011 24 high_7 16.208333333333332
Urban Background 2012 25 high_7 6.6
Urban Background 2013 20 high_7 3.45
Urban Background 2014 23 high_7 8.130434782608695
Urban Background 2015 23 high_7 1
Urban Background 2016 22 high_7 4.363636363636363
Urban Background 2017 24 high_7 0.7916666666666666
Urban Background 2018 22 high_7 1.1818181818181819
Urban Background 2019 26 high_7 1.3846153846153846
Urban Background 2020 40 high_7 1.975
Urban Background 2021 38 high_7 0
Urban Background 2022 44 high_7 3.2954545454545454
Urban Background 2023 53 high_7 0.5471698113207547
Urban Background 2024 57 high_7 0.43859649122807015
Urban Background 2025 69 high_7 0.7391304347826086
Urban Background 1992 2 high_8 98.5
Urban Background 1993 5 high_8 83.2
Urban Background 1994 13 high_8 51.23076923076923
Urban Background 1995 13 high_8 42.61538461538461
Urban Background 1996 16 high_8 63.375
Urban Background 1997 26 high_8 30.96153846153846
Urban Background 1998 33 high_8 11.606060606060606
Urban Background 1999 33 high_8 3.242424242424242
Urban Background 2000 34 high_8 3.6470588235294117
Urban Background 2001 43 high_8 8.465116279069768
Urban Background 2002 39 high_8 1.9743589743589745
Urban Background 2003 38 high_8 5.842105263157895
Urban Background 2004 39 high_8 2.076923076923077
Urban Background 2005 36 high_8 2.2222222222222223
Urban Background 2006 39 high_8 6.128205128205129
Urban Background 2007 32 high_8 11.65625
Urban Background 2008 28 high_8 6.535714285714286
Urban Background 2009 21 high_8 3.2857142857142856
Urban Background 2010 19 high_8 1.5263157894736843
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 1.434782608695652
Urban Background 2015 23 high_8 0.391304347826087
Urban Background 2016 22 high_8 0.4090909090909091
Urban Background 2017 24 high_8 0.375
Urban Background 2018 22 high_8 1.0909090909090908
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 1.5227272727272727
Urban Background 2023 53 high_8 0.1320754716981132
Urban Background 2024 57 high_8 0
Urban Background 2025 69 high_8 0.028985507246376812
Urban Background 1992 2 high_9 46
Urban Background 1993 5 high_9 66.8
Urban Background 1994 13 high_9 33.69230769230769
Urban Background 1995 13 high_9 20.076923076923077
Urban Background 1996 16 high_9 48.3125
Urban Background 1997 26 high_9 19.115384615384617
Urban Background 1998 33 high_9 7.03030303030303
Urban Background 1999 33 high_9 1.0303030303030303
Urban Background 2000 34 high_9 2.4705882352941178
Urban Background 2001 43 high_9 5.441860465116279
Urban Background 2002 39 high_9 1.8461538461538463
Urban Background 2003 38 high_9 3.5789473684210527
Urban Background 2004 39 high_9 0.5897435897435898
Urban Background 2005 36 high_9 2.0833333333333335
Urban Background 2006 39 high_9 4.615384615384615
Urban Background 2007 32 high_9 8.4375
Urban Background 2008 28 high_9 3.892857142857143
Urban Background 2009 21 high_9 0.6190476190476191
Urban Background 2010 19 high_9 0.8947368421052632
Urban Background 2011 24 high_9 3.7916666666666665
Urban Background 2012 25 high_9 1.44
Urban Background 2013 20 high_9 0
Urban Background 2014 23 high_9 0.30434782608695654
Urban Background 2015 23 high_9 0
Urban Background 2016 22 high_9 0.22727272727272727
Urban Background 2017 24 high_9 0.75
Urban Background 2018 22 high_9 0.22727272727272727
Urban Background 2019 26 high_9 0.7307692307692307
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 0.03773584905660377
Urban Background 2024 57 high_9 0
Urban Background 2025 69 high_9 0.043478260869565216
Urban Background 1992 2 vhigh_10 171
Urban Background 1993 5 vhigh_10 69.4
Urban Background 1994 13 vhigh_10 48.15384615384615
Urban Background 1995 13 vhigh_10 26.46153846153846
Urban Background 1996 16 vhigh_10 79.625
Urban Background 1997 26 vhigh_10 26.115384615384617
Urban Background 1998 33 vhigh_10 9.363636363636363
Urban Background 1999 33 vhigh_10 2.6666666666666665
Urban Background 2000 34 vhigh_10 3.7058823529411766
Urban Background 2001 43 vhigh_10 12.674418604651162
Urban Background 2002 39 vhigh_10 3.8461538461538463
Urban Background 2003 38 vhigh_10 4.7368421052631575
Urban Background 2004 39 vhigh_10 2.2564102564102564
Urban Background 2005 36 vhigh_10 5
Urban Background 2006 39 vhigh_10 5.769230769230769
Urban Background 2007 32 vhigh_10 10.1875
Urban Background 2008 28 vhigh_10 4.785714285714286
Urban Background 2009 21 vhigh_10 0
Urban Background 2010 19 vhigh_10 1.894736842105263
Urban Background 2011 24 vhigh_10 5.166666666666667
Urban Background 2012 25 vhigh_10 0
Urban Background 2013 20 vhigh_10 0
Urban Background 2014 23 vhigh_10 3.3043478260869565
Urban Background 2015 23 vhigh_10 0
Urban Background 2016 22 vhigh_10 2.272727272727273
Urban Background 2017 24 vhigh_10 0.9166666666666666
Urban Background 2018 22 vhigh_10 0
Urban Background 2019 26 vhigh_10 1.2307692307692308
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 0.32075471698113206
Urban Background 2024 57 vhigh_10 0
Urban Background 2025 69 vhigh_10 0.2463768115942029