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Statistical data set

Figure 15: Mean hours when O3 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 4 mod_4 12
Urban Background 1993 8 mod_4 10.5
Urban Background 1994 13 mod_4 21.384615384615383
Urban Background 1995 12 mod_4 53.75
Urban Background 1996 18 mod_4 38.5
Urban Background 1997 31 mod_4 35.12903225806452
Urban Background 1998 42 mod_4 19.80952380952381
Urban Background 1999 42 mod_4 61.476190476190474
Urban Background 2000 41 mod_4 29.48780487804878
Urban Background 2001 43 mod_4 40.13953488372093
Urban Background 2002 45 mod_4 27.733333333333334
Urban Background 2003 47 mod_4 104.57446808510639
Urban Background 2004 50 mod_4 44.68
Urban Background 2005 49 mod_4 38.142857142857146
Urban Background 2006 48 mod_4 102.77083333333333
Urban Background 2007 45 mod_4 48.266666666666666
Urban Background 2008 43 mod_4 96.11627906976744
Urban Background 2009 41 mod_4 34.31707317073171
Urban Background 2010 42 mod_4 19.5
Urban Background 2011 43 mod_4 49.116279069767444
Urban Background 2012 42 mod_4 35.19047619047619
Urban Background 2013 41 mod_4 40.46341463414634
Urban Background 2014 42 mod_4 32.785714285714285
Urban Background 2015 42 mod_4 22.642857142857142
Urban Background 2016 41 mod_4 39.34146341463415
Urban Background 2017 41 mod_4 21.024390243902438
Urban Background 2018 42 mod_4 93.38095238095238
Urban Background 2019 39 mod_4 48.15384615384615
Urban Background 2020 39 mod_4 93.74358974358974
Urban Background 2021 38 mod_4 33.81578947368421
Urban Background 2022 40 mod_4 74.1
Urban Background 2023 51 mod_4 77.94117647058823
Urban Background 2024 60 mod_4 49.11666666666667
Urban Background 2025 61 mod_4 99.0327868852459
Urban Background 1992 4 mod_5 1
Urban Background 1993 8 mod_5 3.625
Urban Background 1994 13 mod_5 7.923076923076923
Urban Background 1995 12 mod_5 31.166666666666668
Urban Background 1996 18 mod_5 19.61111111111111
Urban Background 1997 31 mod_5 10.548387096774194
Urban Background 1998 42 mod_5 2.7142857142857144
Urban Background 1999 42 mod_5 21.38095238095238
Urban Background 2000 41 mod_5 7.536585365853658
Urban Background 2001 43 mod_5 14.813953488372093
Urban Background 2002 45 mod_5 4.933333333333334
Urban Background 2003 47 mod_5 42.87234042553192
Urban Background 2004 50 mod_5 13.42
Urban Background 2005 49 mod_5 10
Urban Background 2006 48 mod_5 50.083333333333336
Urban Background 2007 45 mod_5 6.488888888888889
Urban Background 2008 43 mod_5 22.953488372093023
Urban Background 2009 41 mod_5 3.8292682926829267
Urban Background 2010 42 mod_5 3.9047619047619047
Urban Background 2011 43 mod_5 8.093023255813954
Urban Background 2012 42 mod_5 8.428571428571429
Urban Background 2013 41 mod_5 5.804878048780488
Urban Background 2014 42 mod_5 2.5714285714285716
Urban Background 2015 42 mod_5 5
Urban Background 2016 41 mod_5 7.146341463414634
Urban Background 2017 41 mod_5 5.048780487804878
Urban Background 2018 42 mod_5 20.88095238095238
Urban Background 2019 39 mod_5 22.871794871794872
Urban Background 2020 39 mod_5 27.487179487179485
Urban Background 2021 38 mod_5 6.2368421052631575
Urban Background 2022 40 mod_5 27.725
Urban Background 2023 51 mod_5 29.647058823529413
Urban Background 2024 60 mod_5 8.833333333333334
Urban Background 2025 61 mod_5 29.59016393442623
Urban Background 1992 4 mod_6 0
Urban Background 1993 8 mod_6 2.625
Urban Background 1994 13 mod_6 3.4615384615384617
Urban Background 1995 12 mod_6 12.583333333333334
Urban Background 1996 18 mod_6 8.555555555555555
Urban Background 1997 31 mod_6 3.903225806451613
Urban Background 1998 42 mod_6 0.38095238095238093
Urban Background 1999 42 mod_6 8.047619047619047
Urban Background 2000 41 mod_6 1.1219512195121952
Urban Background 2001 43 mod_6 4.069767441860465
Urban Background 2002 45 mod_6 0.8666666666666667
Urban Background 2003 47 mod_6 18.51063829787234
Urban Background 2004 50 mod_6 2.7
Urban Background 2005 49 mod_6 2.3877551020408165
Urban Background 2006 48 mod_6 24.291666666666668
Urban Background 2007 45 mod_6 0.4444444444444444
Urban Background 2008 43 mod_6 3.255813953488372
Urban Background 2009 41 mod_6 1.4878048780487805
Urban Background 2010 42 mod_6 0.5476190476190477
Urban Background 2011 43 mod_6 0.9534883720930233
Urban Background 2012 42 mod_6 1.4761904761904763
Urban Background 2013 41 mod_6 1.6097560975609757
Urban Background 2014 42 mod_6 0.07142857142857142
Urban Background 2015 42 mod_6 1.7142857142857142
Urban Background 2016 41 mod_6 0.3902439024390244
Urban Background 2017 41 mod_6 1.024390243902439
Urban Background 2018 42 mod_6 3.9285714285714284
Urban Background 2019 39 mod_6 6.256410256410256
Urban Background 2020 39 mod_6 11.179487179487179
Urban Background 2021 38 mod_6 0.2631578947368421
Urban Background 2022 40 mod_6 10.15
Urban Background 2023 51 mod_6 7.03921568627451
Urban Background 2024 60 mod_6 1.1166666666666667
Urban Background 2025 61 mod_6 6.131147540983607
Urban Background 1992 4 high_7 0
Urban Background 1993 8 high_7 0.125
Urban Background 1994 13 high_7 1.4615384615384615
Urban Background 1995 12 high_7 4.416666666666667
Urban Background 1996 18 high_7 1.6666666666666667
Urban Background 1997 31 high_7 1.8064516129032258
Urban Background 1998 42 high_7 0.14285714285714285
Urban Background 1999 42 high_7 2.380952380952381
Urban Background 2000 41 high_7 0.0975609756097561
Urban Background 2001 43 high_7 1.1395348837209303
Urban Background 2002 45 high_7 0.3111111111111111
Urban Background 2003 47 high_7 6.319148936170213
Urban Background 2004 50 high_7 0.52
Urban Background 2005 49 high_7 0.5510204081632653
Urban Background 2006 48 high_7 10.1875
Urban Background 2007 45 high_7 0
Urban Background 2008 43 high_7 0.18604651162790697
Urban Background 2009 41 high_7 0.21951219512195122
Urban Background 2010 42 high_7 0
Urban Background 2011 43 high_7 0
Urban Background 2012 42 high_7 0.047619047619047616
Urban Background 2013 41 high_7 0.024390243902439025
Urban Background 2014 42 high_7 0
Urban Background 2015 42 high_7 0.42857142857142855
Urban Background 2016 41 high_7 0
Urban Background 2017 41 high_7 0.21951219512195122
Urban Background 2018 42 high_7 0.6190476190476191
Urban Background 2019 39 high_7 1.5897435897435896
Urban Background 2020 39 high_7 1.9743589743589745
Urban Background 2021 38 high_7 0
Urban Background 2022 40 high_7 1.45
Urban Background 2023 51 high_7 0.8823529411764706
Urban Background 2024 60 high_7 0
Urban Background 2025 61 high_7 0.16393442622950818
Urban Background 1992 4 high_8 0
Urban Background 1993 8 high_8 0
Urban Background 1994 13 high_8 0
Urban Background 1995 12 high_8 0.25
Urban Background 1996 18 high_8 0.1111111111111111
Urban Background 1997 31 high_8 0.22580645161290322
Urban Background 1998 42 high_8 0
Urban Background 1999 42 high_8 0.2857142857142857
Urban Background 2000 41 high_8 0
Urban Background 2001 43 high_8 0.09302325581395349
Urban Background 2002 45 high_8 0
Urban Background 2003 47 high_8 0.7659574468085106
Urban Background 2004 50 high_8 0
Urban Background 2005 49 high_8 0
Urban Background 2006 48 high_8 1.6041666666666667
Urban Background 2007 45 high_8 0
Urban Background 2008 43 high_8 0
Urban Background 2009 41 high_8 0
Urban Background 2010 42 high_8 0
Urban Background 2011 43 high_8 0
Urban Background 2012 42 high_8 0
Urban Background 2013 41 high_8 0
Urban Background 2014 42 high_8 0
Urban Background 2015 42 high_8 0
Urban Background 2016 41 high_8 0
Urban Background 2017 41 high_8 0
Urban Background 2018 42 high_8 0
Urban Background 2019 39 high_8 0.07692307692307693
Urban Background 2020 39 high_8 0
Urban Background 2021 38 high_8 0
Urban Background 2022 40 high_8 0
Urban Background 2023 51 high_8 0
Urban Background 2024 60 high_8 0
Urban Background 2025 61 high_8 0
Urban Background 1992 4 high_9 0
Urban Background 1993 8 high_9 0
Urban Background 1994 13 high_9 0
Urban Background 1995 12 high_9 0
Urban Background 1996 18 high_9 0
Urban Background 1997 31 high_9 0
Urban Background 1998 42 high_9 0
Urban Background 1999 42 high_9 0.09523809523809523
Urban Background 2000 41 high_9 0
Urban Background 2001 43 high_9 0
Urban Background 2002 45 high_9 0
Urban Background 2003 47 high_9 0
Urban Background 2004 50 high_9 0
Urban Background 2005 49 high_9 0
Urban Background 2006 48 high_9 0.125
Urban Background 2007 45 high_9 0
Urban Background 2008 43 high_9 0
Urban Background 2009 41 high_9 0
Urban Background 2010 42 high_9 0
Urban Background 2011 43 high_9 0
Urban Background 2012 42 high_9 0
Urban Background 2013 41 high_9 0
Urban Background 2014 42 high_9 0
Urban Background 2015 42 high_9 0
Urban Background 2016 41 high_9 0
Urban Background 2017 41 high_9 0
Urban Background 2018 42 high_9 0
Urban Background 2019 39 high_9 0
Urban Background 2020 39 high_9 0
Urban Background 2021 38 high_9 0
Urban Background 2022 40 high_9 0
Urban Background 2023 51 high_9 0
Urban Background 2024 60 high_9 0
Urban Background 2025 61 high_9 0
Urban Background 1992 4 vhigh_10 0
Urban Background 1993 8 vhigh_10 0
Urban Background 1994 13 vhigh_10 0
Urban Background 1995 12 vhigh_10 0
Urban Background 1996 18 vhigh_10 0
Urban Background 1997 31 vhigh_10 0
Urban Background 1998 42 vhigh_10 0
Urban Background 1999 42 vhigh_10 0
Urban Background 2000 41 vhigh_10 0
Urban Background 2001 43 vhigh_10 0
Urban Background 2002 45 vhigh_10 0
Urban Background 2003 47 vhigh_10 0
Urban Background 2004 50 vhigh_10 0
Urban Background 2005 49 vhigh_10 0
Urban Background 2006 48 vhigh_10 0
Urban Background 2007 45 vhigh_10 0
Urban Background 2008 43 vhigh_10 0
Urban Background 2009 41 vhigh_10 0
Urban Background 2010 42 vhigh_10 0
Urban Background 2011 43 vhigh_10 0
Urban Background 2012 42 vhigh_10 0
Urban Background 2013 41 vhigh_10 0
Urban Background 2014 42 vhigh_10 0
Urban Background 2015 42 vhigh_10 0
Urban Background 2016 41 vhigh_10 0
Urban Background 2017 41 vhigh_10 0
Urban Background 2018 42 vhigh_10 0
Urban Background 2019 39 vhigh_10 0
Urban Background 2020 39 vhigh_10 0
Urban Background 2021 38 vhigh_10 0
Urban Background 2022 40 vhigh_10 0
Urban Background 2023 51 vhigh_10 0
Urban Background 2024 60 vhigh_10 0
Urban Background 2025 61 vhigh_10 0