SmogRank / Countries / New Zealand / May 2025

Most polluted cities in New Zealand, May 2025

5 cities in New Zealand ranked by their average PM2.5 over the 31 days. Worst: Rangiora at 15.5 µg/m³, #208 of 2,193 cities in the world. Cleanest: Dunedin at 6.7. A city needs measurements on 70% of the days to be ranked.

  1. 1RangioraCanterbury
    15.5
  2. 2ChristchurchCanterbury
    12.4
  3. 3TimaruCanterbury
    11.3
  4. 4AshburtonCanterbury
    10.8
  5. 5Dunedinlow-cost sensorsOtago
    6.7
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, May 2025 · New Zealand now

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SmogRank, most polluted cities in New Zealand, PM2.5, May 2025, smogrank.com/nz/history/2025-05 (accessed 2 Oct 2026).

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