SmogRank / United States / Alabama / Gadsden
Gadsden, month by month
Gadsden has a measured daily mean on 1,257 days since 1 January 2023. Its worst month was June 2023, at 59 US AQI (13.3 µg/m³), 465th of 1,603 cities on that month's world ranking. Its cleanest was October 2025, at 33 US AQI (6.0 µg/m³). 2025 averaged 47 US AQI (8.4 µg/m³), against 50 US AQI (9.0 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
4 months
| Month | Why |
|---|---|
| May 2026 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
| Jan 2023 | 20 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 5 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.
Gadsden's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2023 | 5913.3 µg/m³ | 465thof 1,603 | Eastern United States and Canada, June and July 2023 |
| March 2026 | 5712.5 µg/m³ | 1,124thof 2,971 | South-eastern United States, March 2026 |
| August 2023 | 5511.5 µg/m³ | 393rdof 1,980 | – |
| August 2024 | 5511.5 µg/m³ | 391stof 2,010 | – |
| July 2023 | 5511.0 µg/m³ | 538thof 1,432 | Eastern United States and Canada, June and July 2023 |
| September 2025 | 5410.9 µg/m³ | 571stof 3,104 | – |
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.
Gadsden's worst days
| Day | US AQI | Episode |
|---|---|---|
| 20 Mar 2026 | 9733.9 µg/m³ | South-eastern United States, March 2026 |
| 21 Feb 2024 | 9331.7 µg/m³ | South-eastern United States, February 2024 |
| 22 Mar 2023 | 8929.6 µg/m³ | Eastern United States, March 2023 |
| 12 Mar 2025 | 8225.9 µg/m³ | – |
| 30 Jun 2023 | 8225.8 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 22 Feb 2024 | 8125.3 µg/m³ | South-eastern United States, February 2024 |
| 2 Aug 2024 | 8024.7 µg/m³ | – |
| 24 Nov 2024 | 8024.5 µg/m³ | – |
| 10 Jun 2023 | 7924.0 µg/m³ | – |
| 6 Mar 2026 | 7823.6 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, Gadsden, United States, 1 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/gadsden/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.
Gadsden now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 23:07 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).