Auckland vs Rangiora: PM2.5 compared

Over the last year, Rangiora's air was about 4.5× as polluted as Auckland's: PM2.5 averaged 8.9 µg/m³ against 2.0, on the 325 days both cities were measured. Rangiora had the dirtier air on 316 of those days, Auckland on 8. Rangiora was over the WHO's daily guideline of 15 µg/m³ on 46 of them, Auckland on 1.

Right now

Auckland#2,736on the 24-hour board of 2,753, at 3 US AQI (0.6 µg/m³)

Rangiora#1,513on the 24-hour board of 2,753, at 33 US AQI (6.0 µg/m³)

The last year, day by day

Auckland

Rangiora

Each city's daily mean from 10 Oct 2025 to 9 Oct 2026, one stripe a day, coloured by band. A blank stripe is a day without a daily mean.

Month by month

Monthly means in µg/m³ over the days both cities were measured. Solid: Auckland. Faded: Rangiora. A month shows once both share 10 such days. Dashed line: the WHO daily guideline, 15 µg/m³.

Year by year

Year	Auckland	Rangiora	Days both measured	Days Auckland was worse
2026 so far	12	53	267	3
2025	14	52	219	15
2024	8	28	92	7

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

Rangiora

3 Jul 202615764.4 µg/m³
18 Jul 202612545.2 µg/m³
19 Jul 202612043.1 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 Kaiapoi (New Zealand's worst on 30 days), Gujranwala (the world's worst on 30 days).

Rangiora

Side by side with Kaiapoi (the nearest), Gujranwala (the world's worst on 30 days).

Use this page

SmogRank, PM2.5 daily means compared, Auckland and Rangiora, 10 Oct 2025 – 9 Oct 2026, smogrank.com/compare/nz-auckland/nz-rangiora (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).