Statistical data set
Figure 14: Mean hours when O3 pollution was 鈥楳oderate鈥� or higher for rural background sites, 1987 to 2025
Updated 30 June 2026
| Site type | Year | Number of sites | Daily Air Quality Index | Mean number of hours per site |
|---|---|---|---|---|
| Rural Background | 1987 | 6 | mod_4 | 53.166666666666664 |
| Rural Background | 1988 | 12 | mod_4 | 123.58333333333333 |
| Rural Background | 1989 | 14 | mod_4 | 144.57142857142858 |
| Rural Background | 1990 | 15 | mod_4 | 155.6 |
| Rural Background | 1991 | 13 | mod_4 | 169.46153846153845 |
| Rural Background | 1992 | 14 | mod_4 | 181 |
| Rural Background | 1993 | 15 | mod_4 | 95.4 |
| Rural Background | 1994 | 14 | mod_4 | 114.85714285714286 |
| Rural Background | 1995 | 15 | mod_4 | 135.73333333333332 |
| Rural Background | 1996 | 15 | mod_4 | 106.06666666666666 |
| Rural Background | 1997 | 16 | mod_4 | 139.625 |
| Rural Background | 1998 | 17 | mod_4 | 64.17647058823529 |
| Rural Background | 1999 | 17 | mod_4 | 128.88235294117646 |
| Rural Background | 2000 | 16 | mod_4 | 66.125 |
| Rural Background | 2001 | 16 | mod_4 | 98.4375 |
| Rural Background | 2002 | 18 | mod_4 | 75.11111111111111 |
| Rural Background | 2003 | 19 | mod_4 | 208.52631578947367 |
| Rural Background | 2004 | 19 | mod_4 | 116.10526315789474 |
| Rural Background | 2005 | 20 | mod_4 | 108.7 |
| Rural Background | 2006 | 21 | mod_4 | 221.14285714285714 |
| Rural Background | 2007 | 20 | mod_4 | 103.85 |
| Rural Background | 2008 | 20 | mod_4 | 194.6 |
| Rural Background | 2009 | 22 | mod_4 | 87.22727272727273 |
| Rural Background | 2010 | 21 | mod_4 | 58.142857142857146 |
| Rural Background | 2011 | 22 | mod_4 | 101.72727272727273 |
| Rural Background | 2012 | 21 | mod_4 | 69.0952380952381 |
| Rural Background | 2013 | 21 | mod_4 | 100.52380952380952 |
| Rural Background | 2014 | 22 | mod_4 | 47.81818181818182 |
| Rural Background | 2015 | 22 | mod_4 | 52.68181818181818 |
| Rural Background | 2016 | 22 | mod_4 | 70.27272727272727 |
| Rural Background | 2017 | 20 | mod_4 | 39.85 |
| Rural Background | 2018 | 20 | mod_4 | 167.3 |
| Rural Background | 2019 | 19 | mod_4 | 111.3157894736842 |
| Rural Background | 2020 | 19 | mod_4 | 107.36842105263158 |
| Rural Background | 2021 | 18 | mod_4 | 62.111111111111114 |
| Rural Background | 2022 | 18 | mod_4 | 115.72222222222223 |
| Rural Background | 2023 | 20 | mod_4 | 104.25 |
| Rural Background | 2024 | 21 | mod_4 | 56.095238095238095 |
| Rural Background | 2025 | 21 | mod_4 | 118.38095238095238 |
| Rural Background | 1987 | 6 | mod_5 | 27.333333333333332 |
| Rural Background | 1988 | 12 | mod_5 | 35.5 |
| Rural Background | 1989 | 14 | mod_5 | 71.35714285714286 |
| Rural Background | 1990 | 15 | mod_5 | 84.4 |
| Rural Background | 1991 | 13 | mod_5 | 59.69230769230769 |
| Rural Background | 1992 | 14 | mod_5 | 93.14285714285714 |
| Rural Background | 1993 | 15 | mod_5 | 30.466666666666665 |
| Rural Background | 1994 | 14 | mod_5 | 36.92857142857143 |
| Rural Background | 1995 | 15 | mod_5 | 79.33333333333333 |
| Rural Background | 1996 | 15 | mod_5 | 53.06666666666667 |
| Rural Background | 1997 | 16 | mod_5 | 43.5 |
| Rural Background | 1998 | 17 | mod_5 | 15.235294117647058 |
| Rural Background | 1999 | 17 | mod_5 | 48.94117647058823 |
| Rural Background | 2000 | 16 | mod_5 | 15.625 |
| Rural Background | 2001 | 16 | mod_5 | 33.4375 |
| Rural Background | 2002 | 18 | mod_5 | 13.055555555555555 |
| Rural Background | 2003 | 19 | mod_5 | 81.63157894736842 |
| Rural Background | 2004 | 19 | mod_5 | 30.42105263157895 |
| Rural Background | 2005 | 20 | mod_5 | 20.45 |
| Rural Background | 2006 | 21 | mod_5 | 77.0952380952381 |
| Rural Background | 2007 | 20 | mod_5 | 14.4 |
| Rural Background | 2008 | 20 | mod_5 | 37.95 |
| Rural Background | 2009 | 22 | mod_5 | 8.227272727272727 |
| Rural Background | 2010 | 21 | mod_5 | 8 |
| Rural Background | 2011 | 22 | mod_5 | 16.136363636363637 |
| Rural Background | 2012 | 21 | mod_5 | 11.095238095238095 |
| Rural Background | 2013 | 21 | mod_5 | 5.333333333333333 |
| Rural Background | 2014 | 22 | mod_5 | 3.590909090909091 |
| Rural Background | 2015 | 22 | mod_5 | 9.363636363636363 |
| Rural Background | 2016 | 22 | mod_5 | 15.227272727272727 |
| Rural Background | 2017 | 20 | mod_5 | 6 |
| Rural Background | 2018 | 20 | mod_5 | 36.4 |
| Rural Background | 2019 | 19 | mod_5 | 41.94736842105263 |
| Rural Background | 2020 | 19 | mod_5 | 39.94736842105263 |
| Rural Background | 2021 | 18 | mod_5 | 11.166666666666666 |
| Rural Background | 2022 | 18 | mod_5 | 41.388888888888886 |
| Rural Background | 2023 | 20 | mod_5 | 35.85 |
| Rural Background | 2024 | 21 | mod_5 | 6.714285714285714 |
| Rural Background | 2025 | 21 | mod_5 | 31 |
| Rural Background | 1987 | 6 | mod_6 | 22.666666666666668 |
| Rural Background | 1988 | 12 | mod_6 | 5.166666666666667 |
| Rural Background | 1989 | 14 | mod_6 | 37.357142857142854 |
| Rural Background | 1990 | 15 | mod_6 | 39.666666666666664 |
| Rural Background | 1991 | 13 | mod_6 | 15.153846153846153 |
| Rural Background | 1992 | 14 | mod_6 | 33.42857142857143 |
| Rural Background | 1993 | 15 | mod_6 | 15.133333333333333 |
| Rural Background | 1994 | 14 | mod_6 | 13.928571428571429 |
| Rural Background | 1995 | 15 | mod_6 | 53 |
| Rural Background | 1996 | 15 | mod_6 | 28.266666666666666 |
| Rural Background | 1997 | 16 | mod_6 | 16.3125 |
| Rural Background | 1998 | 17 | mod_6 | 4.117647058823529 |
| Rural Background | 1999 | 17 | mod_6 | 20.176470588235293 |
| Rural Background | 2000 | 16 | mod_6 | 1.9375 |
| Rural Background | 2001 | 16 | mod_6 | 7.9375 |
| Rural Background | 2002 | 18 | mod_6 | 2.5555555555555554 |
| Rural Background | 2003 | 19 | mod_6 | 32.578947368421055 |
| Rural Background | 2004 | 19 | mod_6 | 8.947368421052632 |
| Rural Background | 2005 | 20 | mod_6 | 6.55 |
| Rural Background | 2006 | 21 | mod_6 | 30.714285714285715 |
| Rural Background | 2007 | 20 | mod_6 | 0.6 |
| Rural Background | 2008 | 20 | mod_6 | 4.25 |
| Rural Background | 2009 | 22 | mod_6 | 0.7727272727272727 |
| Rural Background | 2010 | 21 | mod_6 | 2 |
| Rural Background | 2011 | 22 | mod_6 | 3.1363636363636362 |
| Rural Background | 2012 | 21 | mod_6 | 3.619047619047619 |
| Rural Background | 2013 | 21 | mod_6 | 0.9523809523809523 |
| Rural Background | 2014 | 22 | mod_6 | 0.8636363636363636 |
| Rural Background | 2015 | 22 | mod_6 | 2.6363636363636362 |
| Rural Background | 2016 | 22 | mod_6 | 2.8636363636363638 |
| Rural Background | 2017 | 20 | mod_6 | 1.45 |
| Rural Background | 2018 | 20 | mod_6 | 7.6 |
| Rural Background | 2019 | 19 | mod_6 | 17.105263157894736 |
| Rural Background | 2020 | 19 | mod_6 | 13.631578947368421 |
| Rural Background | 2021 | 18 | mod_6 | 0.3333333333333333 |
| Rural Background | 2022 | 18 | mod_6 | 14.666666666666666 |
| Rural Background | 2023 | 20 | mod_6 | 8.7 |
| Rural Background | 2024 | 21 | mod_6 | 1 |
| Rural Background | 2025 | 21 | mod_6 | 5.619047619047619 |
| Rural Background | 1987 | 6 | high_7 | 6.333333333333333 |
| Rural Background | 1988 | 12 | high_7 | 2.1666666666666665 |
| Rural Background | 1989 | 14 | high_7 | 22.357142857142858 |
| Rural Background | 1990 | 15 | high_7 | 23.066666666666666 |
| Rural Background | 1991 | 13 | high_7 | 2.923076923076923 |
| Rural Background | 1992 | 14 | high_7 | 18.714285714285715 |
| Rural Background | 1993 | 15 | high_7 | 6.6 |
| Rural Background | 1994 | 14 | high_7 | 8.285714285714286 |
| Rural Background | 1995 | 15 | high_7 | 28.4 |
| Rural Background | 1996 | 15 | high_7 | 13.733333333333333 |
| Rural Background | 1997 | 16 | high_7 | 5.0625 |
| Rural Background | 1998 | 17 | high_7 | 0.6470588235294118 |
| Rural Background | 1999 | 17 | high_7 | 7.470588235294118 |
| Rural Background | 2000 | 16 | high_7 | 0 |
| Rural Background | 2001 | 16 | high_7 | 2.625 |
| Rural Background | 2002 | 18 | high_7 | 1.1111111111111112 |
| Rural Background | 2003 | 19 | high_7 | 10.052631578947368 |
| Rural Background | 2004 | 19 | high_7 | 1.9473684210526316 |
| Rural Background | 2005 | 20 | high_7 | 2.65 |
| Rural Background | 2006 | 21 | high_7 | 12.142857142857142 |
| Rural Background | 2007 | 20 | high_7 | 0 |
| Rural Background | 2008 | 20 | high_7 | 0.2 |
| Rural Background | 2009 | 22 | high_7 | 0.36363636363636365 |
| Rural Background | 2010 | 21 | high_7 | 0.3333333333333333 |
| Rural Background | 2011 | 22 | high_7 | 0.36363636363636365 |
| Rural Background | 2012 | 21 | high_7 | 0.47619047619047616 |
| Rural Background | 2013 | 21 | high_7 | 0.14285714285714285 |
| Rural Background | 2014 | 22 | high_7 | 0.18181818181818182 |
| Rural Background | 2015 | 22 | high_7 | 1.5909090909090908 |
| Rural Background | 2016 | 22 | high_7 | 0.18181818181818182 |
| Rural Background | 2017 | 20 | high_7 | 0.25 |
| Rural Background | 2018 | 20 | high_7 | 1.45 |
| Rural Background | 2019 | 19 | high_7 | 3.473684210526316 |
| Rural Background | 2020 | 19 | high_7 | 4.894736842105263 |
| Rural Background | 2021 | 18 | high_7 | 0 |
| Rural Background | 2022 | 18 | high_7 | 5.5 |
| Rural Background | 2023 | 20 | high_7 | 0.65 |
| Rural Background | 2024 | 21 | high_7 | 0 |
| Rural Background | 2025 | 21 | high_7 | 0.14285714285714285 |
| Rural Background | 1987 | 6 | high_8 | 0 |
| Rural Background | 1988 | 12 | high_8 | 0.25 |
| Rural Background | 1989 | 14 | high_8 | 4.714285714285714 |
| Rural Background | 1990 | 15 | high_8 | 9.4 |
| Rural Background | 1991 | 13 | high_8 | 0.6153846153846154 |
| Rural Background | 1992 | 14 | high_8 | 5.357142857142857 |
| Rural Background | 1993 | 15 | high_8 | 2.6 |
| Rural Background | 1994 | 14 | high_8 | 2.2142857142857144 |
| Rural Background | 1995 | 15 | high_8 | 5.666666666666667 |
| Rural Background | 1996 | 15 | high_8 | 1.6 |
| Rural Background | 1997 | 16 | high_8 | 0.375 |
| Rural Background | 1998 | 17 | high_8 | 0.23529411764705882 |
| Rural Background | 1999 | 17 | high_8 | 0.29411764705882354 |
| Rural Background | 2000 | 16 | high_8 | 0 |
| Rural Background | 2001 | 16 | high_8 | 0 |
| Rural Background | 2002 | 18 | high_8 | 0 |
| Rural Background | 2003 | 19 | high_8 | 2.210526315789474 |
| Rural Background | 2004 | 19 | high_8 | 0 |
| Rural Background | 2005 | 20 | high_8 | 0.1 |
| Rural Background | 2006 | 21 | high_8 | 2.9523809523809526 |
| Rural Background | 2007 | 20 | high_8 | 0 |
| Rural Background | 2008 | 20 | high_8 | 0 |
| Rural Background | 2009 | 22 | high_8 | 0.045454545454545456 |
| Rural Background | 2010 | 21 | high_8 | 0 |
| Rural Background | 2011 | 22 | high_8 | 0 |
| Rural Background | 2012 | 21 | high_8 | 0 |
| Rural Background | 2013 | 21 | high_8 | 0 |
| Rural Background | 2014 | 22 | high_8 | 0 |
| Rural Background | 2015 | 22 | high_8 | 0.5 |
| Rural Background | 2016 | 22 | high_8 | 0 |
| Rural Background | 2017 | 20 | high_8 | 0 |
| Rural Background | 2018 | 20 | high_8 | 0.1 |
| Rural Background | 2019 | 19 | high_8 | 0.6842105263157895 |
| Rural Background | 2020 | 19 | high_8 | 0.21052631578947367 |
| Rural Background | 2021 | 18 | high_8 | 0 |
| Rural Background | 2022 | 18 | high_8 | 0.7777777777777778 |
| Rural Background | 2023 | 20 | high_8 | 0 |
| Rural Background | 2024 | 21 | high_8 | 0 |
| Rural Background | 2025 | 21 | high_8 | 0 |
| Rural Background | 1987 | 6 | high_9 | 0 |
| Rural Background | 1988 | 12 | high_9 | 0 |
| Rural Background | 1989 | 14 | high_9 | 1.0714285714285714 |
| Rural Background | 1990 | 15 | high_9 | 4.066666666666666 |
| Rural Background | 1991 | 13 | high_9 | 0.3076923076923077 |
| Rural Background | 1992 | 14 | high_9 | 0.9285714285714286 |
| Rural Background | 1993 | 15 | high_9 | 0 |
| Rural Background | 1994 | 14 | high_9 | 0.14285714285714285 |
| Rural Background | 1995 | 15 | high_9 | 1.0666666666666667 |
| Rural Background | 1996 | 15 | high_9 | 0.3333333333333333 |
| Rural Background | 1997 | 16 | high_9 | 0 |
| Rural Background | 1998 | 17 | high_9 | 0 |
| Rural Background | 1999 | 17 | high_9 | 0 |
| Rural Background | 2000 | 16 | high_9 | 0 |
| Rural Background | 2001 | 16 | high_9 | 0 |
| Rural Background | 2002 | 18 | high_9 | 0 |
| Rural Background | 2003 | 19 | high_9 | 0.2631578947368421 |
| Rural Background | 2004 | 19 | high_9 | 0 |
| Rural Background | 2005 | 20 | high_9 | 0 |
| Rural Background | 2006 | 21 | high_9 | 0.19047619047619047 |
| Rural Background | 2007 | 20 | high_9 | 0 |
| Rural Background | 2008 | 20 | high_9 | 0 |
| Rural Background | 2009 | 22 | high_9 | 0 |
| Rural Background | 2010 | 21 | high_9 | 0 |
| Rural Background | 2011 | 22 | high_9 | 0 |
| Rural Background | 2012 | 21 | high_9 | 0 |
| Rural Background | 2013 | 21 | high_9 | 0 |
| Rural Background | 2014 | 22 | high_9 | 0 |
| Rural Background | 2015 | 22 | high_9 | 0.045454545454545456 |
| Rural Background | 2016 | 22 | high_9 | 0 |
| Rural Background | 2017 | 20 | high_9 | 0 |
| Rural Background | 2018 | 20 | high_9 | 0 |
| Rural Background | 2019 | 19 | high_9 | 0 |
| Rural Background | 2020 | 19 | high_9 | 0 |
| Rural Background | 2021 | 18 | high_9 | 0 |
| Rural Background | 2022 | 18 | high_9 | 0 |
| Rural Background | 2023 | 20 | high_9 | 0 |
| Rural Background | 2024 | 21 | high_9 | 0 |
| Rural Background | 2025 | 21 | high_9 | 0 |
| Rural Background | 1987 | 6 | vhigh_10 | 0 |
| Rural Background | 1988 | 12 | vhigh_10 | 0 |
| Rural Background | 1989 | 14 | vhigh_10 | 0.07142857142857142 |
| Rural Background | 1990 | 15 | vhigh_10 | 2 |
| Rural Background | 1991 | 13 | vhigh_10 | 0 |
| Rural Background | 1992 | 14 | vhigh_10 | 0 |
| Rural Background | 1993 | 15 | vhigh_10 | 0 |
| Rural Background | 1994 | 14 | vhigh_10 | 0 |
| Rural Background | 1995 | 15 | vhigh_10 | 0.5333333333333333 |
| Rural Background | 1996 | 15 | vhigh_10 | 0 |
| Rural Background | 1997 | 16 | vhigh_10 | 0 |
| Rural Background | 1998 | 17 | vhigh_10 | 0 |
| Rural Background | 1999 | 17 | vhigh_10 | 0 |
| Rural Background | 2000 | 16 | vhigh_10 | 0 |
| Rural Background | 2001 | 16 | vhigh_10 | 0 |
| Rural Background | 2002 | 18 | vhigh_10 | 0 |
| Rural Background | 2003 | 19 | vhigh_10 | 0 |
| Rural Background | 2004 | 19 | vhigh_10 | 0 |
| Rural Background | 2005 | 20 | vhigh_10 | 0 |
| Rural Background | 2006 | 21 | vhigh_10 | 0.23809523809523808 |
| Rural Background | 2007 | 20 | vhigh_10 | 0 |
| Rural Background | 2008 | 20 | vhigh_10 | 0 |
| Rural Background | 2009 | 22 | vhigh_10 | 0 |
| Rural Background | 2010 | 21 | vhigh_10 | 0 |
| Rural Background | 2011 | 22 | vhigh_10 | 0 |
| Rural Background | 2012 | 21 | vhigh_10 | 0 |
| Rural Background | 2013 | 21 | vhigh_10 | 0 |
| Rural Background | 2014 | 22 | vhigh_10 | 0 |
| Rural Background | 2015 | 22 | vhigh_10 | 0 |
| Rural Background | 2016 | 22 | vhigh_10 | 0 |
| Rural Background | 2017 | 20 | vhigh_10 | 0 |
| Rural Background | 2018 | 20 | vhigh_10 | 0 |
| Rural Background | 2019 | 19 | vhigh_10 | 0 |
| Rural Background | 2020 | 19 | vhigh_10 | 0 |
| Rural Background | 2021 | 18 | vhigh_10 | 0 |
| Rural Background | 2022 | 18 | vhigh_10 | 0 |
| Rural Background | 2023 | 20 | vhigh_10 | 0 |
| Rural Background | 2024 | 21 | vhigh_10 | 0 |
| Rural Background | 2025 | 21 | vhigh_10 | 0 |