Wednesday 6 August 2025
As a regional council, we are required under the National environmental standards for air quality (NESAQ, 2004) to report any breach of the ambient air quality standard.
The National Environmental Standards for Air Quality (NESAQ) for 24-hour PM10 (Particulate Matter with a diameter of 10 micrometres or less) is: 50 µg/m³
PM10 concentrations in June 2025 exceeded the standard as follows:
| June | Arrowtown |
| Air Zone 1 | |
| PM10 Concentration (µg/m³) | |
| 15th | 60 |
| 17th | 52 |
| 18th | 53 |
| Total exceedances | 3 |
PM10 concentrations in July 2025 exceeded the standard as follows:
| July | Alexandra | Arrowtown | Mosgiel |
| Air Zone 1 | Air Zone 2 | ||
| PM10 Concentration (µg/m³) | |||
| 10th | 54 | ||
| 17th | 58 | ||
| 18th | 51 | ||
| 19th | 57 | ||
| 20th | 51 | ||
| 21st | 52 | ||
| 23rd | 62 | ||
| 24th | 55 | ||
| 25th | 88 | ||
| 26th | 80 | 63 | |
| 28th | 71 | ||
| Total exceedances | 3 | 8 | 1 |
