Auckland vs Kaiapoi: PM2.5 compared
Over the last year, Kaiapoi's air was about 5.3× as polluted as Auckland's: PM2.5 averaged 10.5 µg/m³ against 2.0, on the 316 days both cities were measured. Kaiapoi had the dirtier air on 310 of those days, Auckland on 5. Kaiapoi was over the WHO's daily guideline of 15 µg/m³ on 65 of them, Auckland on 1.
Right now
The last year, day by day
Month by month
Year by year
| Year | Auckland | Kaiapoi | Days Auckland was worse |
|---|---|---|---|
| 2026 so far | 12 | 56 | 3 |
| 2025 | 14 | 55 | 9 |
| 2024 | 8 | 33 | 3 |
Means in US AQI over the days both cities were measured that year; a year shows once they share 30 such days.
Each city's worst days
Auckland
- 3 Jul 20266215.1 µg/m³
- 12 Jul 20265712.3 µg/m³
- 2 Jul 20265310.3 µg/m³
Kaiapoi
- 18 Jul 202616068.7 µg/m³
- 19 Jul 202614352.7 µg/m³
- 7 Aug 202613449.0 µg/m³
Daily means in US AQI, with µg/m³ beside them, since the index stops at its top value, over the days both cities were measured in the last year. Each date opens that day's world board.
Compare either city with another
Auckland
Side by side with Rangiora (the nearest), Gujranwala (the world's worst on 30 days).
Kaiapoi
Side by side with Rangiora (the nearest), Timaru (New Zealand's 2nd worst on 30 days), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Auckland and Kaiapoi, 10 Oct 2025 – 9 Oct 2026, smogrank.com/compare/nz-auckland/nz-kaiapoi (accessed 9 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.
The same rules as every SmogRank figure: reference monitors first, and a day counts with 18 measured hours. How we measure.
Updated 2026-10-09 12:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); Love My Air (City and County of Denver), no reuse terms published (why we use them).