SmogRank / Australia / Queensland / Maryborough

Maryborough, month by month

Maryborough has a measured daily mean on 1,119 days since 1 January 2023. Its worst month was October 2025, at 42 US AQI (7.6 µg/m³), 989th of 2,614 cities on that month's world ranking. Its cleanest was April 2025, at 21 US AQI (3.8 µg/m³). 2025 averaged 31 US AQI (5.5 µg/m³), against 33 US AQI (6.0 µg/m³) in 2024.

Every month since 2023

2026too few days for a mean (a year needs 200)199 days measured

Jan30#2,271 Feb27#2,614 Mar25#2,749 Apr32#2,307 May30#2,187 Jun41#1,331Jul11 daysAugnoneSepnoneOct37#1,796

202531 for the year361 days measured2,455th of 2,681 in the world

Jan26#2,280 Feb29#2,330 Mar23#2,623 Apr21#2,814 May31#2,135 Jun27#2,315 Jul27#2,632 Aug36#2,395 Sep38#1,725 Oct42#989 Nov37#1,996 Dec28#2,673

202433 for the year326 days measured1,774th of 2,097 in the world

Jan31#1,957 Feb29#2,055Mar21 daysApr27#2,002 May31#2,156 Jun31#2,133 Jul29#2,190 Aug40#1,489 Sep41#1,062 Oct39#1,118Nov17 daysDec28#2,281

2023too few days for a mean (a year needs 256)233 days measured

Jan34#969Feb2 daysMar9 daysApr19 daysMay17 daysJun11 daysJul18 daysAug34#1,612 Sep32#1,864Oct20 daysNov34#1,690 Dec39#1,545

Each square is a month's mean PM2.5 in US AQI from Maryborough'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 Maryborough 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

12 months

Month	Why
Sep 2026	No day measured. The others: 30 with readings for part of the day (a day needs 18 hours).
Aug 2026	No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2026	11 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Nov 2024	17 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks.
Mar 2024	21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Oct 2023	20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Jul 2023	18 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 12 with under 18 hours of readings or readings that failed our checks.
Jun 2023	11 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks.
May 2023	17 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Apr 2023	19 of 30 days measured; a month needs 21. The others: 2 missing from OpenAQ's archive, 9 with under 18 hours of readings or readings that failed our checks.
Mar 2023	9 of 31 days measured; a month needs 22. The others: 19 missing from OpenAQ's archive, 3 with under 18 hours of readings or readings that failed our checks.
Feb 2023	2 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 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.

Maryborough's worst months

Month	US AQI	Days measured	World rank
October 2025	427.6 µg/m³	31 of 31	989thof 2,614
September 2024	417.3 µg/m³	30 of 30	1,062ndof 2,010
June 2026	417.3 µg/m³	28 of 30	1,331stof 2,497
August 2024	407.2 µg/m³	31 of 31	1,489thof 2,010
December 2023	397.0 µg/m³	30 of 31	1,545thof 2,247
October 2024	397.0 µg/m³	31 of 31	1,118thof 2,020

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.

Maryborough's worst days

Day	US AQI
5 Nov 2024	8627.8 µg/m³
25 Sept 2025	8225.6 µg/m³
7 Aug 2025	7522.1 µg/m³
2 Dec 2023	7421.3 µg/m³
10 Nov 2025	7421.2 µg/m³
24 Jun 2026	7421.2 µg/m³
22 May 2025	7119.8 µg/m³
26 Sept 2025	7119.7 µg/m³
25 Oct 2025	7019.2 µg/m³
18 Jun 2023	6918.7 µg/m³

Daily means, the highest since 1 Jan 2023; 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, Maryborough, Australia, 1 Jan 2023 – 12 Oct 2026. Monitor data from Queensland Government, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/au/maryborough/history (accessed 12 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.

Maryborough 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).