SmogRank / Cleaner or dirtier / New Zealand
New Zealand: cleaner or dirtier, 2025
In New Zealand, 4 cities have enough days in both years to compare 2025 with the same days of 2024: 2 got dirtier and 2 cleaner.
The 2 cities that got dirtier, biggest rise first
| # | City | 2024 | 2025 | Change |
|---|---|---|---|---|
| 1 | ChristchurchCanterbury, New Zealand | 49 | 52 | +0.6 µg/m³+7% |
| 2 | TimaruCanterbury, New Zealand | 53 | 53 | +0.1 µg/m³+1% |
The 2 cities that got cleaner, biggest fall first
| # | City | 2024 | 2025 | Change |
|---|---|---|---|---|
| 1 | KaiapoiCanterbury, New Zealand | 59 | 58 | −0.4 µg/m³−3% |
| 2 | RangioraCanterbury, New Zealand | 52 | 52 | −0.3 µg/m³−3% |
Means in US AQI over the days a city was measured in both years, the same calendar days each year; a city needs 55% of the days paired, and at least 30. The change is in µg/m³ and per cent. How we compare.
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
Updated 2026-10-07 12:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.