SmogRank / New Zealand / Canterbury / Christchurch
Christchurch, month by month
Christchurch has a measured daily mean on 888 days since 23 March 2024. Its worst month was July 2025, at 62 US AQI (15.1 µg/m³), 398th of 2,889 cities on that month's world ranking. Its cleanest was December 2025, at 22 US AQI (4.0 µg/m³). 2025 averaged 45 US AQI (8.1 µg/m³), against 46 US AQI (8.3 µg/m³) in 2024.
Every month since 2024
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
Months without a mean, and why
2 months
| Month | Why |
|---|---|
| Oct 2025 | 10 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | 9 of 31 days measured; a month needs 22. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Christchurch's worst months
| Month | US AQI | World rank |
|---|---|---|
| July 2025 | 6215.1 µg/m³ | 398thof 2,889 |
| June 2025 | 6214.9 µg/m³ | 452ndof 2,508 |
| July 2026 | 6214.8 µg/m³ | 531stof 2,784 |
| May 2024 | 6114.2 µg/m³ | 320thof 2,684 |
| July 2024 | 5913.5 µg/m³ | 257thof 2,566 |
| June 2026 | 5913.4 µg/m³ | 403rdof 2,497 |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Christchurch's worst days
| Day | US AQI |
|---|---|
| 15 Jun 2025 | 13147.5 µg/m³ |
| 5 Jul 2024 | 12746.1 µg/m³ |
| 4 Aug 2024 | 11039.2 µg/m³ |
| 3 Jun 2025 | 10938.7 µg/m³ |
| 16 May 2025 | 9633.3 µg/m³ |
| 12 Jul 2026 | 9633.1 µg/m³ |
| 27 Jul 2025 | 9532.8 µg/m³ |
| 7 Jul 2024 | 9432.3 µg/m³ |
| 21 Jul 2026 | 9432.3 µg/m³ |
| 3 Aug 2026 | 9432.3 µg/m³ |
Daily means, the highest since 23 Mar 2024; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Christchurch, New Zealand, 23 Mar 2024 – 12 Oct 2026. Monitor data from Environment Canterbury via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/nz/christchurch/history (accessed 12 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Christchurch now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 19:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).