SmogRank / New Zealand / Otago / Dunedin

Dunedin, month by month

Dunedin has a measured daily mean on 714 days since 21 September 2024. Its worst month was July 2025, at 59 US AQI (13.6 µg/m³), 542nd of 2,889 cities on that month's world ranking. Its cleanest was October 2025, at 8 US AQI (1.5 µg/m³).

Every month since 2024

202634 so far285 days measured2,471st of 2,798 in the world
Jan12#2,610Feb16#2,829Mar14#2,950Apr24#2,656May56#580Jun53#637Jul54#1,187Aug39#2,047Sep17#2,928Oct26#2,278
202528 for the year330 days measured2,515th of 2,681 in the world
Jan10 daysFeb17 daysMar17#2,806Apr21#2,814May36#1,759Jun48#1,676Jul59#542Aug52#1,374Sep15#3,073Oct8#2,613Nov13#2,697Dec9#3,000
2024too few days for a mean (a year needs 257)99 days measured
JanFebMarAprMayJunJulAugSep9 daysOct23#1,909Nov19#2,520Dec16#2,566
Each square is a month's mean PM2.5 in US AQI from Dunedin's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Dunedin marked; each year, the year's. A dashed square is the running month, so far.
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

Months without a mean, and why

3 months
MonthWhy
Feb 202517 of 28 days measured; a month needs 20. The others: 11 with under 18 hours of readings or readings that failed our checks.
Jan 202510 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Sep 20249 of 30 days measured; a month needs 21. The others: 1 with under 18 hours of readings or readings that failed our checks.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Dunedin's worst months

MonthUS AQIDays measuredWorld rank
July 2025 5913.6 µg/m³31 of 31542ndof 2,889
May 2026 5612.0 µg/m³31 of 31580thof 2,874
July 2026 5410.7 µg/m³31 of 311,187thof 2,784
June 2026 5310.2 µg/m³30 of 30637thof 2,497
August 2025 529.4 µg/m³31 of 311,374thof 2,901
June 2025 488.7 µg/m³28 of 301,676thof 2,508

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.

Dunedin's worst days

DayUS AQI
7 Aug 2026 9230.9 µg/m³
30 Jun 2026 8728.3 µg/m³
6 Aug 2025 8427.0 µg/m³
17 May 2026 8326.5 µg/m³
1 Jul 2026 8326.1 µg/m³
24 Jul 2025 8225.8 µg/m³
5 Aug 2025 8024.8 µg/m³
2 Jul 2026 7924.3 µg/m³
18 Jul 2025 7924.1 µg/m³
17 Jul 2026 7823.8 µg/m³

Daily means, the highest since 21 Sept 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, Dunedin, New Zealand, 21 Sep 2024 – 12 Oct 2026. Monitor data from AirGradient via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/nz/dunedin/history (accessed 13 Oct 2026).

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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.

Dunedin now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-13 01:07 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).