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There are four charts measuring CO concentrations in the Bay of Plenty.
The first two charts show one-hour and 8-hour concentrations of CO (measured by air quality categories) in Rotorua in 1999 (measurements were not taken between March and June). Air quality was mostly “Good” or “Excellent”, and was at its best in the summer months.
The second two charts show one-hour and 8-hour concentrations of CO (measured by air quality categories) in Tauranga in 2000. Air quality varied between “Good” and “Excellent” during this period, with the best air quality in spring.