SmogRank / New Zealand / Canterbury / Timaru
Timaru, month by month
Timaru has a measured daily mean on 882 days since 23 March 2024. Its worst month was July 2025, at 72 US AQI (20.6 µg/m³), 189th of 2,889 cities on that month's world ranking. Its cleanest was December 2025, at 27 US AQI (4.9 µg/m³). 2025 averaged 51 US AQI (9.2 µg/m³), against 52 US AQI (9.8 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.
Timaru's worst months
| Month | US AQI | World rank |
|---|---|---|
| July 2025 | 7220.6 µg/m³ | 189thof 2,889 |
| July 2026 | 7220.5 µg/m³ | 314thof 2,784 |
| July 2024 | 6315.7 µg/m³ | 163rdof 2,566 |
| June 2024 | 6215.2 µg/m³ | 201stof 2,563 |
| June 2026 | 6114.3 µg/m³ | 373rdof 2,497 |
| August 2025 | 5913.6 µg/m³ | 478thof 2,901 |
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.
Timaru's worst days
| Day | US AQI |
|---|---|
| 13 Jul 2026 | 15156.0 µg/m³ |
| 28 Jul 2025 | 13348.3 µg/m³ |
| 3 Jul 2026 | 12244.1 µg/m³ |
| 24 Jul 2025 | 11239.8 µg/m³ |
| 11 Jul 2026 | 9834.4 µg/m³ |
| 7 Aug 2026 | 9834.4 µg/m³ |
| 2 Jul 2026 | 9633.2 µg/m³ |
| 12 Jul 2026 | 9331.8 µg/m³ |
| 26 Jul 2025 | 9230.9 µg/m³ |
| 30 Jul 2026 | 9130.8 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, Timaru, New Zealand, 23 Mar 2024 – 12 Oct 2026. Monitor data from Environment Canterbury via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/nz/timaru/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.
Timaru now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 21:07 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).