SmogRank / Countries / New Zealand / 2025

Most polluted cities in New Zealand, 2025

5 cities in New Zealand ranked by their average PM2.5 over the 365 days; 5 above the WHO annual guideline (5.0 µg/m³). Worst: Rangiora at 10.0 µg/m³, #690 of 2,131 cities in the world. Cleanest: Dunedin at 5.1. A city needs measurements on 70% of the days to be ranked.

  1. 1RangioraCanterbury
    10.02.0×
  2. 2TimaruCanterbury
    9.21.8×
  3. 3AshburtonCanterbury
    8.61.7×
  4. 4ChristchurchCanterbury
    8.11.6×
  5. 5Dunedinlow-cost sensorsOtago
    5.11.0×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

All cities in the world, 2025 · New Zealand now