SmogRank / Australia / Queensland / Gladstone

Gladstone, month by month

Gladstone has a measured daily mean on 1,146 days since 1 January 2023. Its worst month was December 2023, at 41 US AQI (7.3 µg/m³), 1,473rd of 2,247 cities on that month's world ranking. Its cleanest was July 2025, at 21 US AQI (3.8 µg/m³). 2025 averaged 29 US AQI (5.2 µg/m³), against 31 US AQI (5.5 µg/m³) in 2024.

Every month since 2023

202626 so far201 days measured2,677th of 2,791 in the world

Jan29#2,309 Feb24#2,669 Mar27#2,708 Apr29#2,449 May24#2,540 Jun22#2,317Jul11 daysAugnoneSepnoneOct35#1,845

202529 for the year363 days measured2,503rd of 2,681 in the world

Jan31#2,093 Feb34#2,067 Mar27#2,525 Apr29#2,506 May24#2,493 Jun22#2,410 Jul21#2,785 Aug30#2,635 Sep27#2,646 Oct40#1,105 Nov37#1,959 Dec27#2,719

202431 for the year349 days measured1,883rd of 2,097 in the world

Jan32#1,909 Feb32#1,929Mar21 daysApr26#2,065 May26#2,321 Jun24#2,326 Jul27#2,306 Aug33#1,752 Sep40#1,100 Oct38#1,156 Nov31#2,171 Dec26#2,331

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

Jan33#982Feb2 daysMar9 daysApr19 daysMay17 daysJun11 daysJul18 daysAug31#1,744 Sep39#1,467Oct20 daysNov34#1,654 Dec41#1,473

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

11 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.
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.

Gladstone's worst months

Month	US AQI	Days measured	World rank
December 2023	417.3 µg/m³	30 of 31	1,473rdof 2,247
September 2024	407.2 µg/m³	30 of 30	1,100thof 2,010
October 2025	407.2 µg/m³	31 of 31	1,105thof 2,614
September 2023	397.1 µg/m³	30 of 30	1,467thof 2,176
October 2024	386.9 µg/m³	31 of 31	1,156thof 2,020
November 2025	376.7 µg/m³	30 of 30	1,959thof 2,715

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.

Gladstone's worst days

Day	US AQI
28 Oct 2023	13047.2 µg/m³
30 Apr 2025	10336.4 µg/m³
27 Oct 2023	10336.3 µg/m³
30 Mar 2023	8024.8 µg/m³
29 Oct 2023	7119.6 µg/m³
2 Oct 2025	7019.2 µg/m³
3 Oct 2025	6918.7 µg/m³
1 May 2025	6818.2 µg/m³
3 Nov 2023	6114.6 µg/m³
14 Dec 2023	6114.4 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, Gladstone, 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/gladstone/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.

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

Updated 2026-10-12 20:07 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).