SmogRank / Countries / New Zealand / December 2025

Most polluted cities in New Zealand, December 2025

4 cities in New Zealand ranked by their average PM2.5 over the 31 days. Worst: Timaru at 4.9 µg/m³, #2,147 of 2,360 cities in the world. Cleanest: Dunedin at 1.5. A city needs measurements on 70% of the days to be ranked.

  1. 1TimaruCanterbury
    4.9
  2. 2ChristchurchCanterbury
    4.0
  3. 3RangioraCanterbury
    3.8
  4. 4Dunedinlow-cost sensorsOtago
    1.5
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, December 2025 · New Zealand now