SmogRank / Australia / New South Wales / Coffs Harbour
Coffs Harbour, month by month
Coffs Harbour has a measured daily mean on 1,264 days since 1 January 2023. Its worst month was September 2025, at 47 US AQI (8.4 µg/m³), 1,085th of 3,104 cities on that month's world ranking. Its cleanest was January 2023, at 12 US AQI (2.1 µg/m³). 2025 averaged 27 US AQI (4.8 µg/m³), against 26 US AQI (4.7 µg/m³) in 2024.
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
4 months
| Month | Why |
|---|---|
| Feb 2026 | 16 of 28 days measured; a month needs 20. The others: 5 with no readings from the monitor, 7 with readings for part of the day (a day needs 18 hours). |
| May 2025 | 17 of 31 days measured; a month needs 22. The others: 14 with readings for part of the day (a day needs 18 hours). |
| Jan 2024 | 12 of 31 days measured; a month needs 22. The others: 17 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours). |
| Mar 2023 | 20 of 31 days measured; a month needs 22. The others: 1 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours), 4 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Coffs Harbour's worst months
| Month | US AQI | World rank |
|---|---|---|
| September 2025 | 478.4 µg/m³ | 1,085thof 3,104 |
| October 2025 | 447.9 µg/m³ | 913thof 2,614 |
| April 2026 | 447.9 µg/m³ | 1,625thof 2,941 |
| October 2023 | 437.7 µg/m³ | 862ndof 2,012 |
| September 2024 | 397.1 µg/m³ | 1,126thof 2,010 |
| August 2023 | 376.6 µg/m³ | 1,455thof 1,980 |
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.
Coffs Harbour's worst days
| Day | US AQI |
|---|---|
| 15 Apr 2026 | 11239.9 µg/m³ |
| 16 Apr 2026 | 10235.9 µg/m³ |
| 19 Mar 2026 | 9834.1 µg/m³ |
| 17 Apr 2026 | 8627.7 µg/m³ |
| 27 Sept 2025 | 8426.6 µg/m³ |
| 28 Sept 2025 | 7722.8 µg/m³ |
| 6 Oct 2025 | 7119.6 µg/m³ |
| 15 Oct 2023 | 6919.0 µg/m³ |
| 8 Oct 2025 | 6918.8 µg/m³ |
| 29 Sept 2025 | 6918.6 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, Coffs Harbour, Australia, 1 Jan 2023 – 12 Oct 2026. Monitor data from NSW DCCEEW, read from the publisher; sources listed at smogrank.com/sources. smogrank.com/au/coffs-harbour/history (accessed 13 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.
Coffs Harbour now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 04:07 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).