SmogRank / United States / Maine / Augusta
Augusta, month by month
Augusta has a measured daily mean on 1,160 days since 13 July 2023. Its worst month was September 2023, at 53 US AQI (10.3 µg/m³), 540th of 2,176 cities on that month's world ranking. Its cleanest was October 2025, at 19 US AQI (3.5 µg/m³). 2025 averaged 32 US AQI (5.8 µg/m³), against 33 US AQI (6.0 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
1 month
| Month | Why |
|---|---|
| Jul 2023 | 19 of 31 days measured; a month needs 22. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Augusta's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| September 2023 | 5310.3 µg/m³ | 540thof 2,176 | Eastern Canada and United States, September 2023 |
| July 2025 | 529.6 µg/m³ | 1,361stof 2,889 | North-eastern United States and Canada, 29 July to 9 August 2025 North-eastern United States and Canada, 24 to 28 July 2025 |
| July 2026 | 498.9 µg/m³ | 1,635thof 2,784 | – |
| August 2024 | 488.7 µg/m³ | 962ndof 2,010 | – |
| December 2023 | 488.6 µg/m³ | 1,073rdof 2,247 | – |
| July 2024 | 488.6 µg/m³ | 1,137thof 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.
Augusta's worst days
| Day | US AQI | Episode |
|---|---|---|
| 26 Jul 2025 | 10436.7 µg/m³ | North-eastern United States and Canada, 24 to 28 July 2025 |
| 4 Aug 2025 | 9231.2 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 6 Sept 2023 | 9130.7 µg/m³ | Eastern Canada and United States, September 2023 |
| 7 Aug 2023 | 8426.6 µg/m³ | – |
| 31 Jul 2025 | 8326.5 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 9 Dec 2023 | 8225.9 µg/m³ | – |
| 8 Jun 2025 | 8225.8 µg/m³ | Northern United States and Canada, May and June 2025 |
| 18 Jul 2026 | 8024.6 µg/m³ | – |
| 23 Jan 2025 | 8024.5 µg/m³ | – |
| 30 Sept 2023 | 7823.5 µg/m³ | – |
Daily means, the highest since 13 Jul 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, Augusta, United States, 13 Jul 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/augusta-maine/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.
Augusta 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).