SmogRank / Australia / Victoria / Melbourne
Melbourne, month by month
Melbourne has a measured daily mean on 599 days since 1 January 2023. Its worst month was May 2024, at 54 US AQI (10.6 µg/m³), 664th of 2,684 cities on that month's world ranking. Its cleanest was September 2024, at 22 US AQI (3.9 µg/m³).
Every month since 2023
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
27 months
| Month | Why |
|---|---|
| Aug 2026 | 9 of 31 days measured; a month needs 22. The others: 22 with no readings from the monitors. |
| Nov 2025 | 12 of 30 days measured; a month needs 21. The others: 18 with no readings from the monitors. |
| Oct 2025 | No day measured. The others: 31 with no readings from the monitors. |
| Sep 2025 | No day measured. The others: 30 with no readings from the monitors. |
| Aug 2025 | No day measured. The others: 31 with no readings from the monitors. |
| Jul 2025 | No day measured. The others: 31 with no readings from the monitors. |
| Jun 2025 | No day measured. The others: 30 with no readings from the monitors. |
| May 2025 | No day measured. The others: 31 with no readings from the monitors. |
| Apr 2025 | No day measured. The others: 30 with no readings from the monitors. |
| Mar 2025 | No day measured. The others: 31 with no readings from the monitors. |
| Feb 2025 | No day measured. The others: 28 with no readings from the monitors. |
| Jan 2025 | 8 of 31 days measured; a month needs 22. The others: 22 with no readings from the monitors, 1 with readings for part of the day (a day needs 18 hours). |
| Apr 2024 | 19 of 30 days measured; a month needs 21. The others: 11 with no readings from the monitors. |
| Mar 2024 | No day measured. The others: 31 with no readings from the monitors. |
| Feb 2024 | No day measured. The others: 28 with no readings from the monitors, 1 missing from OpenAQ's archive. |
| Jan 2024 | No day measured. The others: 31 with no readings from the monitors. |
| Dec 2023 | No day measured. The others: 31 with no readings from the monitors. |
| Nov 2023 | No day measured. The others: 30 with no readings from the monitors. |
| Oct 2023 | No day measured. The others: 31 with no readings from the monitors. |
| Sep 2023 | No day measured. The others: 30 with no readings from the monitors. |
| Aug 2023 | No day measured. The others: 31 with no readings from the monitors. |
| Jul 2023 | No day measured. The others: 30 with no readings from the monitors, 1 missing from OpenAQ's archive. |
| Jun 2023 | No day measured. The others: 30 with no readings from the monitors. |
| May 2023 | No day measured. The others: 31 with no readings from the monitors. |
| Apr 2023 | 4 of 30 days measured; a month needs 21. The others: 22 with no readings from the monitors, 1 with readings for part of the day (a day needs 18 hours), 3 missing from OpenAQ's archive. |
| Mar 2023 | 7 of 31 days measured; a month needs 22. The others: 5 with readings for part of the day (a day needs 18 hours), 19 missing from OpenAQ's archive. |
| Feb 2023 | 2 of 28 days measured; a month needs 20. The others: 1 with readings for part of the day (a day needs 18 hours), 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Melbourne's worst months
| Month | US AQI | World rank |
|---|---|---|
| May 2024 | 5410.6 µg/m³ | 664thof 2,684 |
| January 2026 | 447.9 µg/m³ | 1,526thof 2,617 |
| April 2026 | 417.4 µg/m³ | 1,785thof 2,941 |
| July 2026 | 386.8 µg/m³ | 2,210thof 2,784 |
| May 2026 | 376.6 µg/m³ | 1,737thof 2,874 |
| July 2024 | 366.4 µg/m³ | 1,868thof 2,566 |
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.
Melbourne's worst days
| Day | US AQI |
|---|---|
| 25 Jan 2026 | 8929.6 µg/m³ |
| 9 May 2024 | 8728.3 µg/m³ |
| 31 Jul 2024 | 8728.3 µg/m³ |
| 8 May 2024 | 8426.6 µg/m³ |
| 9 Jul 2026 | 7723.3 µg/m³ |
| 26 May 2024 | 7622.5 µg/m³ |
| 8 Jul 2026 | 7421.5 µg/m³ |
| 27 Jun 2026 | 7019.2 µg/m³ |
| 12 May 2026 | 6918.7 µg/m³ |
| 4 May 2024 | 6818.4 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, Melbourne, Australia, 1 Jan 2023 – 12 Oct 2026. Monitor data from EPA Victoria, read from the publisher; sources listed at smogrank.com/sources. smogrank.com/au/melbourne/history (accessed 12 Oct 2026).
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.
Melbourne 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).