Figure 3.1: Percentage of measured one-hour and 24-hour average NO2 concentrations within air quality categories at Dominion Road, Khyber Pass Road, One Tree Hill and Penrose (ACI site) in Auckland
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There are four charts showing one-hour and 24-hour concentrations of NO2 at various locations in Auckland over a variety of periods. The charts show that concentrations were very high at Khyber Pass between 1998 and 2001, with almost half of the measurements beings “Alert” level or higher. Concentrations were also high at Dominion Road in 1994 and 1995. Levels were lower at One Tree Hill in 1996, and at Penrose in 2000 and 2001, although concentrations increased significantly between these two years.
