SmogRank / Countries / New Zealand / July 2025

Most polluted cities in New Zealand, July 2025

7 cities in New Zealand ranked by their average PM2.5 over the 31 days. Worst: Timaru at 20.6 µg/m³, #112 of 2,283 cities in the world. Cleanest: Hamilton at 8.2. A city needs measurements on 70% of the days to be ranked.

  1. 1TimaruCanterbury
    20.6
  2. 2RangioraCanterbury
    20.2
  3. 3TaupoWaikato Region
    18.2
  4. 4AshburtonCanterbury
    15.6
  5. 5ChristchurchCanterbury
    15.1
  6. 6Dunedinlow-cost sensorsOtago
    13.5
  7. 7HamiltonWaikato Region
    8.2
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, July 2025 · New Zealand now

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SmogRank, most polluted cities in New Zealand, PM2.5, July 2025, smogrank.com/nz/history/2025-07 (accessed 1 Oct 2026).

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