SmogRank / United States / Louisiana / Lafayette
Lafayette, month by month
Lafayette has a measured daily mean on 1,263 days since 1 January 2023. Its worst month was August 2024, at 59 US AQI (13.2 µg/m³), 245th of 2,010 cities on that month's world ranking. Its cleanest was February 2026, at 20 US AQI (3.6 µg/m³). 2025 averaged 46 US AQI (8.2 µg/m³), against 52 US AQI (9.7 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
3 months
| Month | Why |
|---|---|
| Apr 2023 | 18 of 30 days measured; a month needs 21. The others: 3 missing from OpenAQ's archive, 9 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 | 2 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 1 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.
Lafayette's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| August 2024 | 5913.2 µg/m³ | 245thof 2,010 | Southern and eastern United States and Mexico, July and August 2024 |
| October 2024 | 5712.4 µg/m³ | 363rdof 2,020 | – |
| May 2024 | 5511.5 µg/m³ | 531stof 2,684 | Southern United States and Mexico, 7 to 10 May 2024 |
| September 2025 | 5410.7 µg/m³ | 594thof 3,104 | – |
| August 2025 | 5410.6 µg/m³ | 1,099thof 2,901 | – |
| July 2025 | 5310.4 µg/m³ | 1,176thof 2,889 | – |
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.
Lafayette's worst days
| Day | US AQI | Episode |
|---|---|---|
| 31 Jul 2024 | 8829.2 µg/m³ | Southern and eastern United States and Mexico, July and August 2024 |
| 4 Oct 2023 | 8326.5 µg/m³ | South-eastern United States, October 2023 |
| 9 May 2024 | 8225.8 µg/m³ | Southern United States and Mexico, 7 to 10 May 2024 |
| 1 Aug 2024 | 8125.4 µg/m³ | Southern and eastern United States and Mexico, July and August 2024 |
| 21 Aug 2024 | 8024.4 µg/m³ | – |
| 27 May 2024 | 7823.7 µg/m³ | – |
| 1 Jul 2025 | 7823.5 µg/m³ | – |
| 23 May 2023 | 7421.5 µg/m³ | – |
| 2 Jul 2025 | 7421.5 µg/m³ | – |
| 5 Jul 2025 | 7321.0 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, Lafayette, 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/lafayette/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.
Lafayette now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 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).