Table 1.1: Ministry for the Environment's air quality categories
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| Category | Measured value | Comment |
|---|---|---|
|
Excellent |
Less than 10% of the guideline |
Of little concern: if maximum values are less than a 10th of the guideline, average values are likely to be much less |
|
Good |
Between 10% and 33% of the guideline |
Peak measurements in this range are unlikely to affect air quality |
|
Acceptable |
Between 33% and 66% of the guideline |
A broad category, where maximum values might be of concern in some sensitive locations but generally they are at a level which does not warrant urgent action |
|
Alert |
Between 66% and 100% of the guideline |
This is a warning level, which can lead to exceedences if trends are not curbed |
|
Action |
Exceeds the guideline value |
Exceedences of the guideline are a cause for concern and warrant action, particularly if they occur on a regular basis |
