SmogRank / United States / Utah / Brigham City
Brigham City, month by month
Brigham City has a measured daily mean on 653 days since 16 December 2024. Its worst month was August 2026, at 52 US AQI (9.5 µg/m³), 1,034th of 2,896 cities on that month's world ranking. Its cleanest was April 2026, at 20 US AQI (3.6 µg/m³).
Every month since 2024
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
1 month
| Month | Why |
|---|---|
| Dec 2024 | 16 of 31 days measured; a month needs 22. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Brigham City's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| August 2026 | 529.5 µg/m³ | 1,034thof 2,896 | North-western United States and Canada, 4 to 22 August 2026 |
| January 2026 | 468.2 µg/m³ | 1,433rdof 2,617 | – |
| July 2026 | 458.1 µg/m³ | 1,848thof 2,784 | – |
| August 2025 | 448.0 µg/m³ | 1,820thof 2,901 | – |
| July 2025 | 417.4 µg/m³ | 1,907thof 2,889 | – |
| June 2025 | 397.1 µg/m³ | 2,001stof 2,508 | – |
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.
Brigham City's worst days
| Day | US AQI | Episode |
|---|---|---|
| 28 Mar 2025 | 8527.4 µg/m³ | – |
| 5 Aug 2026 | 8426.7 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 6 Aug 2026 | 7924.2 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 4 Aug 2026 | 7421.6 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 14 Jan 2026 | 7320.9 µg/m³ | – |
| 15 Jan 2026 | 7320.7 µg/m³ | – |
| 3 Aug 2026 | 7019.4 µg/m³ | – |
| 22 Dec 2024 | 7019.1 µg/m³ | – |
| 28 Jul 2026 | 6919.0 µg/m³ | – |
| 13 Jan 2026 | 6918.7 µg/m³ | – |
Daily means, the highest since 16 Dec 2024; 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, Brigham City, United States, 16 Dec 2024 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/brigham-city/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.
Brigham City 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).