SmogRank / United States / Utah / Spanish Fork
Spanish Fork, month by month
Spanish Fork has a measured daily mean on 1,357 days since 1 January 2023. Its worst month was June 2025, at 54 US AQI (10.5 µg/m³), 1,150th of 2,508 cities on that month's world ranking. Its cleanest was March 2023, at 20 US AQI (3.6 µg/m³). 2025 averaged 38 US AQI (6.8 µg/m³), against 36 US AQI (6.4 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
Spanish Fork's worst months
| Month | US AQI | World rank |
|---|---|---|
| June 2025 | 5410.5 µg/m³ | 1,150thof 2,508 |
| July 2025 | 5310.4 µg/m³ | 1,176thof 2,889 |
| July 2023 | 5310.0 µg/m³ | 663rdof 1,432 |
| July 2024 | 529.9 µg/m³ | 766thof 2,566 |
| August 2023 | 529.5 µg/m³ | 701stof 1,980 |
| August 2026 | 519.2 µg/m³ | 1,132ndof 2,896 |
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.
Spanish Fork's worst days
| Day | US AQI | Episode |
|---|---|---|
| 30 Nov 2023 | 10436.8 µg/m³ | Utah and Idaho, United States, November 2023 |
| 11 Sept 2024 | 9029.9 µg/m³ | North-western United States and Canada, 4 to 11 September 2024 |
| 21 Jun 2025 | 8829.2 µg/m³ | – |
| 29 Jan 2025 | 8829.1 µg/m³ | – |
| 4 Dec 2024 | 8527.4 µg/m³ | – |
| 23 Jun 2026 | 8426.9 µg/m³ | Utah and Colorado, United States, June 2026 |
| 28 Jan 2025 | 8225.5 µg/m³ | – |
| 20 May 2023 | 8125.0 µg/m³ | North-western United States and Canada, May 2023 |
| 24 Jun 2026 | 7924.3 µg/m³ | Utah and Colorado, United States, June 2026 |
| 5 Dec 2024 | 7924.2 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, Spanish Fork, 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/spanish-fork/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.
Spanish Fork now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 00:07 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).