SmogRank / Countries / New Zealand / March 2025

Most polluted cities in New Zealand, March 2025

5 cities in New Zealand ranked by their average PM2.5 over the 31 days. Worst: Timaru at 5.8 µg/m³, #1,813 of 2,218 cities in the world. Cleanest: Dunedin at 3.0. A city needs measurements on 70% of the days to be ranked.

  1. 1TimaruCanterbury
    5.8
  2. 2AshburtonCanterbury
    5.1
  3. 3ChristchurchCanterbury
    4.3
  4. 4RangioraCanterbury
    4.1
  5. 5Dunedinlow-cost sensorsOtago
    3.0
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, March 2025 · New Zealand now