SmogRank / Countries / New Zealand / October 2025

Most polluted cities in New Zealand, October 2025

3 cities in New Zealand ranked by their average PM2.5 over the 31 days. Worst: Hamilton at 5.6 µg/m³, #1,421 of 2,110 cities in the world. Cleanest: Dunedin at 1.2. A city needs measurements on 70% of the days to be ranked.

  1. 1HamiltonWaikato Region
    5.6
  2. 2TaupoWaikato Region
    4.7
  3. 3Dunedinlow-cost sensorsOtago
    1.2
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, October 2025 · New Zealand now

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SmogRank, most polluted cities in New Zealand, PM2.5, October 2025, smogrank.com/nz/history/2025-10 (accessed 2 Oct 2026).

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