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Key findings - Ozone

Current situation

In 2008, all monitoring sites met the 1-hour national standard and 8-hour national guideline for ground-level ozone (figures 10 and 11).

Ground-level ozone is only monitored continuously in Auckland.

Short monitoring surveys conducted in Coromandel in 200815 and in Christchurch (Lincoln) in 200710 reported that ozone levels at these locations were well below the 1-hour national standard and 8-hour national guideline.

Figure 10: Maximum ozone levels, 1-hour maximum, 1996–2008

Figure 10: Maximum ozone levels, 1-hour maximum, 1996–2008

Source: Auckland Regional Council9

Year Auckland (Musick Point)
(µg/m3)
Auckland (Whangaparaoa) (µg/m3) Auckland (Patumahoe) (µg/m3)
1996     90.2
1997     109.6
1998   116.0 101.4
1999 92.2 105.0 80.7
2000 82.3 100.0 83.3
2001 90.3 93.0 76.8
2002 135.0 103.0 93.0
2003 134.0 88.0 71.5
2004 110.6 101.0 75.2
2005 100.1 95.2 97.2
2006 101.2 77.9 77.4
2007 88.4 87.0 86.6
2008 85.6 93.7 80.7

Figure 11: Maximum ozone levels, 8-hour average, 1996–2008

Figure 11: Maximum ozone levels, 8-hour average, 1996–2008

Source: Auckland Regional Council9

Year Auckland (Musick Point)
(µg/m3)
Auckland (Whangaparaoa) (µg/m3) Auckland (Patumahoe) (µg/m3)
1996     73.3
1997     79.6
1998   80.3 96.5
1999 84.1 82.3 79.5
2000 69.9 74.5 70.2
2001 87.4 82.7 69.0
2002 120.0 92.2 75.7
2003 95.9 74.0 70.0
2004 80.4 78.6 71.0
2005 90.9 80.0 86.9
2006 81.1 73.8 72.4
2007 82.7 77.1 74.2
2008 81.4 76.9 76.1

Figure 12: Annual ozone annual levels, 1996–2008

Figure 12: Annual ozone annual levels, 1996–2008

Source: Auckland Regional Council9

Year Auckland (Musick Point)
(µg/m3)
Auckland (Whangaparaoa) (µg/m3) Auckland (Patumahoe) (µg/m3)
1996     45.3
1997     46.1
1998   49.5 45.5
1999 40.8 48.8 33.0
2000 36.0 44.1 38.0
2001 35.5 43.2 31.4
2002 43.7 49.6 37.6
2003 43.6 44.7 32.3
2004 43.3 44.7 34.6
2005 46.6 46.3 40.0
2006 42.9 44.7 38.2
2007 43.9 49.4 41.1
2008 43.6 48.1 41.3

Trend

Recent trend

Ozone was reported in Environment New Zealand 2007. Since then,ozone levels in Auckland have remained relatively constant. There have been no detected exceedances of the 1-hour national standard or the 8-hour national guideline at any monitoring site in New Zealand in recent years (see the new data presented in figures 10–12).

Long-term trend

Levels of ozone have remained relatively constant. The two exceedances of the 8-hour national guideline at Musick Point in 2002 are assumed to be the result of pollution from fires in Sydney, Australia.16