Statistical data set
Figure 14: Mean hours when O3 pollution was 鈥楳oderate鈥� or higher for rural background sites, 1987 to 2024
Updated 26 June 2025
| 锘縎ite type | Year | Number of sites | Daily Air Quality Index | Mean number of hours per site |
|---|---|---|---|---|
| Rural Background | 1987 | 6 | Moderate 4 | 53.16666667 |
| Rural Background | 1988 | 12 | Moderate 4 | 123.5833333 |
| Rural Background | 1989 | 14 | Moderate 4 | 144.5714286 |
| Rural Background | 1990 | 15 | Moderate 4 | 155.6 |
| Rural Background | 1991 | 13 | Moderate 4 | 169.4615385 |
| Rural Background | 1992 | 14 | Moderate 4 | 181 |
| Rural Background | 1993 | 15 | Moderate 4 | 95.4 |
| Rural Background | 1994 | 14 | Moderate 4 | 114.8571429 |
| Rural Background | 1995 | 15 | Moderate 4 | 135.7333333 |
| Rural Background | 1996 | 15 | Moderate 4 | 106.0666667 |
| Rural Background | 1997 | 16 | Moderate 4 | 139.625 |
| Rural Background | 1998 | 17 | Moderate 4 | 64.17647059 |
| Rural Background | 1999 | 17 | Moderate 4 | 128.8823529 |
| Rural Background | 2000 | 16 | Moderate 4 | 66.125 |
| Rural Background | 2001 | 16 | Moderate 4 | 98.4375 |
| Rural Background | 2002 | 18 | Moderate 4 | 75.11111111 |
| Rural Background | 2003 | 19 | Moderate 4 | 208.5263158 |
| Rural Background | 2004 | 19 | Moderate 4 | 116.1052632 |
| Rural Background | 2005 | 20 | Moderate 4 | 108.7 |
| Rural Background | 2006 | 21 | Moderate 4 | 221.1428571 |
| Rural Background | 2007 | 20 | Moderate 4 | 103.85 |
| Rural Background | 2008 | 20 | Moderate 4 | 194.6 |
| Rural Background | 2009 | 22 | Moderate 4 | 87.22727273 |
| Rural Background | 2010 | 21 | Moderate 4 | 58.14285714 |
| Rural Background | 2011 | 22 | Moderate 4 | 101.7272727 |
| Rural Background | 2012 | 21 | Moderate 4 | 69.0952381 |
| Rural Background | 2013 | 21 | Moderate 4 | 100.5238095 |
| Rural Background | 2014 | 22 | Moderate 4 | 47.81818182 |
| Rural Background | 2015 | 22 | Moderate 4 | 52.68181818 |
| Rural Background | 2016 | 22 | Moderate 4 | 70.27272727 |
| Rural Background | 2017 | 20 | Moderate 4 | 39.85 |
| Rural Background | 2018 | 20 | Moderate 4 | 167.3 |
| Rural Background | 2019 | 19 | Moderate 4 | 111.3157895 |
| Rural Background | 2020 | 19 | Moderate 4 | 107.3684211 |
| Rural Background | 2021 | 18 | Moderate 4 | 62.11111111 |
| Rural Background | 2022 | 18 | Moderate 4 | 115.7222222 |
| Rural Background | 2023 | 20 | Moderate 4 | 104.25 |
| Rural Background | 2024 | 21 | Moderate 4 | 56.0952381 |
| Rural Background | 1987 | 6 | Moderate 5 | 27.33333333 |
| Rural Background | 1988 | 12 | Moderate 5 | 35.5 |
| Rural Background | 1989 | 14 | Moderate 5 | 71.35714286 |
| Rural Background | 1990 | 15 | Moderate 5 | 84.4 |
| Rural Background | 1991 | 13 | Moderate 5 | 59.69230769 |
| Rural Background | 1992 | 14 | Moderate 5 | 93.14285714 |
| Rural Background | 1993 | 15 | Moderate 5 | 30.46666667 |
| Rural Background | 1994 | 14 | Moderate 5 | 36.92857143 |
| Rural Background | 1995 | 15 | Moderate 5 | 79.33333333 |
| Rural Background | 1996 | 15 | Moderate 5 | 53.06666667 |
| Rural Background | 1997 | 16 | Moderate 5 | 43.5 |
| Rural Background | 1998 | 17 | Moderate 5 | 15.23529412 |
| Rural Background | 1999 | 17 | Moderate 5 | 48.94117647 |
| Rural Background | 2000 | 16 | Moderate 5 | 15.625 |
| Rural Background | 2001 | 16 | Moderate 5 | 33.4375 |
| Rural Background | 2002 | 18 | Moderate 5 | 13.05555556 |
| Rural Background | 2003 | 19 | Moderate 5 | 81.63157895 |
| Rural Background | 2004 | 19 | Moderate 5 | 30.42105263 |
| Rural Background | 2005 | 20 | Moderate 5 | 20.45 |
| Rural Background | 2006 | 21 | Moderate 5 | 77.0952381 |
| Rural Background | 2007 | 20 | Moderate 5 | 14.4 |
| Rural Background | 2008 | 20 | Moderate 5 | 37.95 |
| Rural Background | 2009 | 22 | Moderate 5 | 8.227272727 |
| Rural Background | 2010 | 21 | Moderate 5 | 8 |
| Rural Background | 2011 | 22 | Moderate 5 | 16.13636364 |
| Rural Background | 2012 | 21 | Moderate 5 | 11.0952381 |
| Rural Background | 2013 | 21 | Moderate 5 | 5.333333333 |
| Rural Background | 2014 | 22 | Moderate 5 | 3.590909091 |
| Rural Background | 2015 | 22 | Moderate 5 | 9.363636364 |
| Rural Background | 2016 | 22 | Moderate 5 | 15.22727273 |
| Rural Background | 2017 | 20 | Moderate 5 | 6 |
| Rural Background | 2018 | 20 | Moderate 5 | 36.4 |
| Rural Background | 2019 | 19 | Moderate 5 | 41.94736842 |
| Rural Background | 2020 | 19 | Moderate 5 | 39.94736842 |
| Rural Background | 2021 | 18 | Moderate 5 | 11.16666667 |
| Rural Background | 2022 | 18 | Moderate 5 | 41.38888889 |
| Rural Background | 2023 | 20 | Moderate 5 | 35.85 |
| Rural Background | 2024 | 21 | Moderate 5 | 6.714285714 |
| Rural Background | 1987 | 6 | Moderate 6 | 22.66666667 |
| Rural Background | 1988 | 12 | Moderate 6 | 5.166666667 |
| Rural Background | 1989 | 14 | Moderate 6 | 37.35714286 |
| Rural Background | 1990 | 15 | Moderate 6 | 39.66666667 |
| Rural Background | 1991 | 13 | Moderate 6 | 15.15384615 |
| Rural Background | 1992 | 14 | Moderate 6 | 33.42857143 |
| Rural Background | 1993 | 15 | Moderate 6 | 15.13333333 |
| Rural Background | 1994 | 14 | Moderate 6 | 13.92857143 |
| Rural Background | 1995 | 15 | Moderate 6 | 53 |
| Rural Background | 1996 | 15 | Moderate 6 | 28.26666667 |
| Rural Background | 1997 | 16 | Moderate 6 | 16.3125 |
| Rural Background | 1998 | 17 | Moderate 6 | 4.117647059 |
| Rural Background | 1999 | 17 | Moderate 6 | 20.17647059 |
| Rural Background | 2000 | 16 | Moderate 6 | 1.9375 |
| Rural Background | 2001 | 16 | Moderate 6 | 7.9375 |
| Rural Background | 2002 | 18 | Moderate 6 | 2.555555556 |
| Rural Background | 2003 | 19 | Moderate 6 | 32.57894737 |
| Rural Background | 2004 | 19 | Moderate 6 | 8.947368421 |
| Rural Background | 2005 | 20 | Moderate 6 | 6.55 |
| Rural Background | 2006 | 21 | Moderate 6 | 30.71428571 |
| Rural Background | 2007 | 20 | Moderate 6 | 0.6 |
| Rural Background | 2008 | 20 | Moderate 6 | 4.25 |
| Rural Background | 2009 | 22 | Moderate 6 | 0.772727273 |
| Rural Background | 2010 | 21 | Moderate 6 | 2 |
| Rural Background | 2011 | 22 | Moderate 6 | 3.136363636 |
| Rural Background | 2012 | 21 | Moderate 6 | 3.619047619 |
| Rural Background | 2013 | 21 | Moderate 6 | 0.952380952 |
| Rural Background | 2014 | 22 | Moderate 6 | 0.863636364 |
| Rural Background | 2015 | 22 | Moderate 6 | 2.636363636 |
| Rural Background | 2016 | 22 | Moderate 6 | 2.863636364 |
| Rural Background | 2017 | 20 | Moderate 6 | 1.45 |
| Rural Background | 2018 | 20 | Moderate 6 | 7.6 |
| Rural Background | 2019 | 19 | Moderate 6 | 17.10526316 |
| Rural Background | 2020 | 19 | Moderate 6 | 13.63157895 |
| Rural Background | 2021 | 18 | Moderate 6 | 0.333333333 |
| Rural Background | 2022 | 18 | Moderate 6 | 14.66666667 |
| Rural Background | 2023 | 20 | Moderate 6 | 8.7 |
| Rural Background | 2024 | 21 | Moderate 6 | 1 |
| Rural Background | 1987 | 6 | High 7 | 6.333333333 |
| Rural Background | 1988 | 12 | High 7 | 2.166666667 |
| Rural Background | 1989 | 14 | High 7 | 22.35714286 |
| Rural Background | 1990 | 15 | High 7 | 23.06666667 |
| Rural Background | 1991 | 13 | High 7 | 2.923076923 |
| Rural Background | 1992 | 14 | High 7 | 18.71428571 |
| Rural Background | 1993 | 15 | High 7 | 6.6 |
| Rural Background | 1994 | 14 | High 7 | 8.285714286 |
| Rural Background | 1995 | 15 | High 7 | 28.4 |
| Rural Background | 1996 | 15 | High 7 | 13.73333333 |
| Rural Background | 1997 | 16 | High 7 | 5.0625 |
| Rural Background | 1998 | 17 | High 7 | 0.647058824 |
| Rural Background | 1999 | 17 | High 7 | 7.470588235 |
| Rural Background | 2000 | 16 | High 7 | 0 |
| Rural Background | 2001 | 16 | High 7 | 2.625 |
| Rural Background | 2002 | 18 | High 7 | 1.111111111 |
| Rural Background | 2003 | 19 | High 7 | 10.05263158 |
| Rural Background | 2004 | 19 | High 7 | 1.947368421 |
| Rural Background | 2005 | 20 | High 7 | 2.65 |
| Rural Background | 2006 | 21 | High 7 | 12.14285714 |
| Rural Background | 2007 | 20 | High 7 | 0 |
| Rural Background | 2008 | 20 | High 7 | 0.2 |
| Rural Background | 2009 | 22 | High 7 | 0.363636364 |
| Rural Background | 2010 | 21 | High 7 | 0.333333333 |
| Rural Background | 2011 | 22 | High 7 | 0.363636364 |
| Rural Background | 2012 | 21 | High 7 | 0.476190476 |
| Rural Background | 2013 | 21 | High 7 | 0.142857143 |
| Rural Background | 2014 | 22 | High 7 | 0.181818182 |
| Rural Background | 2015 | 22 | High 7 | 1.590909091 |
| Rural Background | 2016 | 22 | High 7 | 0.181818182 |
| Rural Background | 2017 | 20 | High 7 | 0.25 |
| Rural Background | 2018 | 20 | High 7 | 1.45 |
| Rural Background | 2019 | 19 | High 7 | 3.473684211 |
| Rural Background | 2020 | 19 | High 7 | 4.894736842 |
| 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 | 1987 | 6 | High 8 | 0 |
| Rural Background | 1988 | 12 | High 8 | 0.25 |
| Rural Background | 1989 | 14 | High 8 | 4.714285714 |
| Rural Background | 1990 | 15 | High 8 | 9.4 |
| Rural Background | 1991 | 13 | High 8 | 0.615384615 |
| Rural Background | 1992 | 14 | High 8 | 5.357142857 |
| Rural Background | 1993 | 15 | High 8 | 2.6 |
| Rural Background | 1994 | 14 | High 8 | 2.214285714 |
| Rural Background | 1995 | 15 | High 8 | 5.666666667 |
| Rural Background | 1996 | 15 | High 8 | 1.6 |
| Rural Background | 1997 | 16 | High 8 | 0.375 |
| Rural Background | 1998 | 17 | High 8 | 0.235294118 |
| Rural Background | 1999 | 17 | High 8 | 0.294117647 |
| 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 | 2.210526316 |
| Rural Background | 2004 | 19 | High 8 | 0 |
| Rural Background | 2005 | 20 | High 8 | 0.1 |
| Rural Background | 2006 | 21 | High 8 | 2.952380952 |
| Rural Background | 2007 | 20 | High 8 | 0 |
| Rural Background | 2008 | 20 | High 8 | 0 |
| Rural Background | 2009 | 22 | High 8 | 0.045454545 |
| 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 | 0.684210526 |
| Rural Background | 2020 | 19 | High 8 | 0.210526316 |
| Rural Background | 2021 | 18 | High 8 | 0 |
| Rural Background | 2022 | 18 | High 8 | 0.777777778 |
| Rural Background | 2023 | 20 | High 8 | 0 |
| Rural Background | 2024 | 21 | High 8 | 0 |
| Rural Background | 1987 | 6 | High 9 | 0 |
| Rural Background | 1988 | 12 | High 9 | 0 |
| Rural Background | 1989 | 14 | High 9 | 1.071428571 |
| Rural Background | 1990 | 15 | High 9 | 4.066666667 |
| Rural Background | 1991 | 13 | High 9 | 0.307692308 |
| Rural Background | 1992 | 14 | High 9 | 0.928571429 |
| Rural Background | 1993 | 15 | High 9 | 0 |
| Rural Background | 1994 | 14 | High 9 | 0.142857143 |
| Rural Background | 1995 | 15 | High 9 | 1.066666667 |
| Rural Background | 1996 | 15 | High 9 | 0.333333333 |
| 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 | 0.263157895 |
| Rural Background | 2004 | 19 | High 9 | 0 |
| Rural Background | 2005 | 20 | High 9 | 0 |
| Rural Background | 2006 | 21 | High 9 | 0.19047619 |
| 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 | 0.045454545 |
| 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 | 1987 | 6 | Very High 10 | 0 |
| Rural Background | 1988 | 12 | Very High 10 | 0 |
| Rural Background | 1989 | 14 | Very High 10 | 0.071428571 |
| Rural Background | 1990 | 15 | Very High 10 | 2 |
| Rural Background | 1991 | 13 | Very High 10 | 0 |
| Rural Background | 1992 | 14 | Very High 10 | 0 |
| Rural Background | 1993 | 15 | Very High 10 | 0 |
| Rural Background | 1994 | 14 | Very High 10 | 0 |
| Rural Background | 1995 | 15 | Very High 10 | 0.533333333 |
| Rural Background | 1996 | 15 | Very High 10 | 0 |
| Rural Background | 1997 | 16 | Very High 10 | 0 |
| Rural Background | 1998 | 17 | Very High 10 | 0 |
| Rural Background | 1999 | 17 | Very High 10 | 0 |
| Rural Background | 2000 | 16 | Very High 10 | 0 |
| Rural Background | 2001 | 16 | Very High 10 | 0 |
| Rural Background | 2002 | 18 | Very High 10 | 0 |
| Rural Background | 2003 | 19 | Very High 10 | 0 |
| Rural Background | 2004 | 19 | Very High 10 | 0 |
| Rural Background | 2005 | 20 | Very High 10 | 0 |
| Rural Background | 2006 | 21 | Very High 10 | 0.238095238 |
| Rural Background | 2007 | 20 | Very High 10 | 0 |
| Rural Background | 2008 | 20 | Very High 10 | 0 |
| Rural Background | 2009 | 22 | Very High 10 | 0 |
| Rural Background | 2010 | 21 | Very High 10 | 0 |
| Rural Background | 2011 | 22 | Very High 10 | 0 |
| Rural Background | 2012 | 21 | Very High 10 | 0 |
| Rural Background | 2013 | 21 | Very High 10 | 0 |
| Rural Background | 2014 | 22 | Very High 10 | 0 |
| Rural Background | 2015 | 22 | Very High 10 | 0 |
| Rural Background | 2016 | 22 | Very High 10 | 0 |
| Rural Background | 2017 | 20 | Very High 10 | 0 |
| Rural Background | 2018 | 20 | Very High 10 | 0 |
| Rural Background | 2019 | 19 | Very High 10 | 0 |
| Rural Background | 2020 | 19 | Very High 10 | 0 |
| Rural Background | 2021 | 18 | Very High 10 | 0 |
| Rural Background | 2022 | 18 | Very High 10 | 0 |
| Rural Background | 2023 | 20 | Very High 10 | 0 |
| Rural Background | 2024 | 21 | Very High 10 | 0 |