SmogRank / Australia / Queensland / Logan City

Logan City, month by month

Logan City has a measured daily mean on 1,175 days since 1 January 2023. Its worst month was September 2024, at 59 US AQI (13.2 µg/m³), 222nd of 2,010 cities on that month's world ranking. Its cleanest was May 2026, at 22 US AQI (4.0 µg/m³). 2025 averaged 29 US AQI (5.3 µg/m³), against 37 US AQI (6.6 µg/m³) in 2024.

Every month since 2023

202627 so far233 days measured2,653rd of 2,798 in the world
Jan32#2,199Feb26#2,648Mar24#2,770Apr28#2,496May22#2,649Jun24#2,245Jul11 daysAugnoneSep35#1,593Oct30#2,216
202529 for the year362 days measured2,488th of 2,681 in the world
Jan27#2,251Feb29#2,308Mar22#2,666Apr23#2,759May22#2,600Jun25#2,350Jul31#2,486Aug27#2,712Sep38#1,767Oct43#966Nov32#2,220Dec31#2,587
202437 for the year347 days measured1,626th of 2,097 in the world
Jan31#1,937Feb28#2,109Mar21 daysApr24#2,169May26#2,321Jun42#1,475Jul30#2,159Aug46#1,135Sep59#222Oct44#830Nov35#1,906Dec29#2,235
2023too few days for a mean (a year needs 256)233 days measured
Jan24#1,139Feb2 daysMar9 daysApr19 daysMay17 daysJun11 daysJul18 daysAug47#911Sep35#1,699Oct20 daysNov34#1,690Dec46#1,178
Each square is a month's mean PM2.5 in US AQI from Logan City'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 Logan City 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
MonthWhy
Aug 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 202611 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Mar 202421 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Oct 202320 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Jul 202318 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 202311 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks.
May 202317 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Apr 202319 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 20239 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 20232 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.

Logan City's worst months

MonthUS AQIDays measuredWorld rank
September 2024 5913.2 µg/m³30 of 30222ndof 2,010
August 2023 478.4 µg/m³25 of 31911thof 1,980
December 2023 468.3 µg/m³30 of 311,178thof 2,247
August 2024 468.3 µg/m³31 of 311,135thof 2,010
October 2024 447.9 µg/m³31 of 31830thof 2,020
October 2025 437.7 µg/m³31 of 31966thof 2,614

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.

Logan City's worst days

DayUS AQI
23 Sept 2024 11842.4 µg/m³
22 Sept 2024 9331.7 µg/m³
21 Sept 2024 8929.3 µg/m³
5 Sept 2024 8828.9 µg/m³
6 Dec 2023 7924.0 µg/m³
30 Aug 2024 7923.9 µg/m³
14 Aug 2023 7421.2 µg/m³
16 Dec 2023 7320.7 µg/m³
24 Sept 2024 7320.7 µg/m³
7 Dec 2023 7119.8 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, Logan City, 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/logan-city/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.

Logan City 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).