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Figure 2: Auckland TSP seven-day average 1994–2005

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Figure 2 Graph
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The Penrose site has shown a downward trend over this period.  The MOH guideline was exceeded in June 1996 and June 1999.  There is less of a noticeable trend in the Mt Eden data.  The Kowhai and Penrose data from June 2004 shows similar levels.

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