SmogRank / Australia / Queensland / Mount Isa

Mount Isa, month by month

Mount Isa has a measured daily mean on 1,065 days since 11 May 2023. Its worst month was November 2024, at 58 US AQI (13.0 µg/m³), 512th of 2,624 cities on that month's world ranking. Its cleanest was August 2025, at 17 US AQI (3.1 µg/m³). 2025 averaged 28 US AQI (5.0 µg/m³), against 35 US AQI (6.3 µg/m³) in 2024.

Every month since 2023

202621 so far200 days measured2,760th of 2,793 in the world

Jan21#2,529 Feb18#2,808 Mar19#2,879 Apr21#2,780 May19#2,743 Jun23#2,290Jul11 daysAugnoneSepnoneOct46#1,038

202528 for the year343 days measured2,528th of 2,681 in the world

Jan43#1,459 Feb17#2,601 Mar21#2,708 Apr19#2,857 May17#2,743 Jun19#2,450 Jul26#2,675 Aug17#2,878 Sep29#2,453Oct11 daysNov47#1,422 Dec33#2,447

202435 for the year349 days measured1,701st of 2,097 in the world

Jan44#1,255 Feb20#2,369Mar21 daysApr19#2,336 May18#2,555 Jun19#2,450 Jul19#2,501 Aug33#1,752 Sep41#1,062 Oct58#345 Nov58#512 Dec33#2,083

2023too few days for a mean (a year needs 256)173 days measured

JanFebMarAprMay10 daysJun11 daysJul18 daysAug32#1,683 Sep47#964Oct20 daysNov55#358 Dec55#506

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

9 months

Month	Why
Sep 2026	No day measured. The others: 29 with readings for part of the day (a day needs 18 hours), 1 with under 18 hours of readings or readings that failed our checks.
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.
Oct 2025	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	10 of 31 days measured; a month needs 22. The others: 11 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.

Mount Isa's worst months

Month	US AQI	Days measured	World rank
November 2024	5813.0 µg/m³	30 of 30	512thof 2,624
October 2024	5812.8 µg/m³	31 of 31	345thof 2,020
November 2023	5511.5 µg/m³	29 of 30	358thof 2,243
December 2023	5511.2 µg/m³	30 of 31	506thof 2,247
September 2023	478.4 µg/m³	30 of 30	964thof 2,176
November 2025	478.4 µg/m³	30 of 30	1,422ndof 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.

Mount Isa's worst days

Day	US AQI
23 Oct 2024	17995.9 µg/m³
29 Oct 2023	14151.8 µg/m³
30 Oct 2023	12445.0 µg/m³
17 Nov 2024	11641.4 µg/m³
22 Oct 2024	9432.3 µg/m³
31 Oct 2023	9130.5 µg/m³
7 Nov 2024	8628.1 µg/m³
1 Nov 2023	8627.8 µg/m³
22 Oct 2025	8426.9 µg/m³
16 Nov 2024	8226.0 µg/m³

Daily means, the highest since 11 May 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, Mount Isa, Australia, 11 May 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/mount-isa/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.

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

Updated 2026-10-12 21:07 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).