SmogRank / Australia / Queensland / Toowoomba

Toowoomba, month by month

Toowoomba has a measured daily mean on 1,158 days since 1 January 2023. Its worst month was October 2025, at 51 US AQI (9.1 µg/m³), 665th of 2,614 cities on that month's world ranking. Its cleanest was March 2025, at 15 US AQI (2.7 µg/m³). 2025 averaged 27 US AQI (4.9 µg/m³), against 31 US AQI (5.6 µg/m³) in 2024.

Every month since 2023

202627 so far229 days measured2,686th of 2,798 in the world

Jan27#2,370 Feb23#2,700 Mar22#2,823 Apr28#2,496 May19#2,760 Jun17#2,412Jul11 daysAugnoneSep41#1,183 Oct52#646

202527 for the year361 days measured2,543rd of 2,681 in the world

Jan28#2,231 Feb23#2,503 Mar15#2,829 Apr19#2,874 May21#2,645 Jun19#2,450 Jul22#2,763 Aug21#2,824 Sep45#1,205 Oct51#665 Nov31#2,302 Dec28#2,673

202431 for the year345 days measured1,862nd of 2,097 in the world

Jan26#2,152 Feb29#2,081Mar21 daysApr20#2,313 May23#2,411 Jun31#2,153 Jul24#2,381 Aug46#1,163 Sep49#611 Oct39#1,118 Nov34#1,975 Dec24#2,391

2023too few days for a mean (a year needs 256)223 days measured

Jan36#918Feb2 daysMar9 daysApr19 daysMay17 daysJun11 daysJul18 daysAug36#1,488 Sep37#1,597Oct20 daysNov40#1,380 Dec43#1,321

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

10 months

Month	Why
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.

Toowoomba's worst months

Month	US AQI	Days measured	World rank
October 2025	519.1 µg/m³	31 of 31	665thof 2,614
September 2024	498.9 µg/m³	30 of 30	611thof 2,010
August 2024	468.2 µg/m³	31 of 31	1,163rdof 2,010
September 2025	458.1 µg/m³	30 of 30	1,205thof 3,104
December 2023	437.8 µg/m³	22 of 31	1,321stof 2,247
September 2026	417.3 µg/m³	30 of 30	1,183rdof 2,997

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.

Toowoomba's worst days

Day	US AQI
7 Oct 2025	8527.4 µg/m³
4 Oct 2026	8326.5 µg/m³
28 Aug 2024	8125.2 µg/m³
8 Oct 2025	8024.8 µg/m³
15 Dec 2023	8024.6 µg/m³
30 Jan 2025	7923.9 µg/m³
27 Sept 2025	7722.8 µg/m³
28 Sept 2025	7722.8 µg/m³
26 Aug 2024	7622.7 µg/m³
25 Aug 2024	7120.1 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, Toowoomba, 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/toowoomba/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.

Toowoomba 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).