SmogRank / United States / Indiana / Lafayette
Lafayette, month by month
Lafayette, Indiana has a measured daily mean on 1,243 days since 1 January 2023. Its worst month was June 2023, at 77 US AQI (23.0 µg/m³), 214th of 1,603 cities on that month's world ranking. Its cleanest was September 2026, at 29 US AQI (5.2 µg/m³). 2025 averaged 47 US AQI (8.4 µg/m³), against 41 US AQI (7.4 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 2026 | 19 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Feb 2026 | 10 of 28 days measured; a month needs 20. The others: 18 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 |
|---|---|---|---|
| June 2023 | 7723.0 µg/m³ | 214thof 1,603 | Eastern United States and Canada, June and July 2023 United States and Canada, June 2023and 1 more |
| July 2023 | 5812.8 µg/m³ | 306thof 1,432 | Northern United States and Canada, July 2023 United States and Canada, July 2023and 1 more |
| June 2025 | 5712.2 µg/m³ | 774thof 2,508 | Northern United States and Canada, May and June 2025 |
| December 2025 | 5410.8 µg/m³ | 1,172ndof 3,006 | – |
| September 2025 | 5410.6 µg/m³ | 600thof 3,104 | – |
| July 2026 | 5410.6 µg/m³ | 1,211thof 2,784 | Northern United States and Canada, July 2026 |
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 |
|---|---|---|
| 28 Jun 2023 | 208133.0 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 29 Jun 2023 | 13448.9 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 16 Jul 2023 | 12746.2 µg/m³ | United States and Canada, July 2023 |
| 19 Jul 2026 | 11641.5 µg/m³ | Northern United States and Canada, July 2026 |
| 25 Jul 2023 | 10235.8 µg/m³ | Northern United States and Canada, July 2023 |
| 7 Jun 2025 | 9432.2 µg/m³ | Northern United States and Canada, May and June 2025 |
| 1 Aug 2025 | 9331.8 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 15 Mar 2025 | 8929.6 µg/m³ | Eastern United States, March 2025 |
| 20 Jul 2026 | 8929.3 µg/m³ | Northern United States and Canada, July 2026 |
| 18 Jun 2023 | 8426.6 µg/m³ | United States and Canada, June 2023 |
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, Indiana, 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-indiana/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 22:07 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).