SmogRank / United States / Alabama / Huntsville
Huntsville, month by month
Huntsville has a measured daily mean on 1,298 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 28 US AQI (5.0 µg/m³). 2025 averaged 42 US AQI (7.6 µg/m³), against 42 US AQI (7.6 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
2 months
| Month | Why |
|---|---|
| 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. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Huntsville's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2023 | 5913.3 µg/m³ | 465thof 1,603 | Eastern United States and Canada, May and June 2023 |
| July 2023 | 5611.9 µg/m³ | 412thof 1,432 | United States and Canada, July 2023 |
| November 2023 | 5410.7 µg/m³ | 485thof 2,243 | – |
| February 2026 | 5410.7 µg/m³ | 1,253rdof 2,866 | – |
| March 2026 | 5410.6 µg/m³ | 1,515thof 2,971 | – |
| September 2023 | 5310.2 µg/m³ | 563rdof 2,176 | – |
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.
Huntsville's worst days
| Day | US AQI | Episode |
|---|---|---|
| 17 Jul 2023 | 13348.6 µg/m³ | United States and Canada, July 2023 |
| 21 Feb 2024 | 8929.3 µg/m³ | South-eastern United States, February 2024 |
| 22 Mar 2023 | 8829.1 µg/m³ | Eastern United States, March 2023 |
| 18 Jul 2023 | 8828.9 µg/m³ | United States and Canada, July 2023 |
| 5 Jul 2025 | 8326.2 µg/m³ | North-eastern United States, July 2025 |
| 9 Feb 2026 | 8225.5 µg/m³ | – |
| 21 May 2023 | 8125.4 µg/m³ | Southern United States, May 2023 |
| 10 Jun 2023 | 8125.1 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 20 Mar 2026 | 8024.7 µg/m³ | – |
| 2 Aug 2024 | 8024.5 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, Huntsville, 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/huntsville/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.
Huntsville now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 03:07 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).