SmogRank / World / New Zealand / April 2025

Most polluted cities in New Zealand, April 2025

5 cities in New Zealand ranked by their average PM2.5 over the 30 days. Worst: Rangiora at 9.4 µg/m³, #1,261 of 2,569 cities in the world. Cleanest: Dunedin at 3.8. A city needs measurements on 70% of the days to be ranked.

← Rangiora 9.4 µg/m³ 20 µg/m³0
Every city in New Zealand ranked for April 2025, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1RangioraCanterbury
    52
  2. 2ChristchurchCanterbury
    43
  3. 3TimaruCanterbury
    39
  4. 4AshburtonCanterbury
    38
  5. 5Dunedinlow-cost sensorsOtago
    21
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, April 2025 · New Zealand now

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SmogRank, most polluted cities in New Zealand, PM2.5, April 2025, smogrank.com/nz/history/2025-04 (accessed 2 Oct 2026).

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