Air quality in Northland: Whangarei Airshed
Whangarei Airshed
Whangarei Airshed PM10 Exceedences
Note: The NES target for this airshed is provisional.
| Year | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
|---|---|---|---|---|---|---|
| Method | HiVol | Hi Vol/ BAM | BAM | BAM | BAM | BAM |
| Valid data (%) | less than 50% | 66% | 36% annual, 41% during winter | 96% | 78% | 85% |
| No of exceedences PM10 | 0 | 1 | 0 | 0 | 0 | 0 |
| 2nd highest 24 hour average | 28 | 47 | 32 | 32 | 34 | 38 |
| Highest 24-hour average | 47 | 52 | 38 | 35 | 94* | 50 |
| Annual average | <75% valid data | <75% valid data | <75% valid data | 14 | 14 | 13 |
Source: Northland Regional Council
* The 2009 highest 24-hour average value for this airshed was due to transboundary pollution from the Australian dust storms. The exceedance due to this event has been excluded from the table.
Last updated: 2 August 2011
