SmogRank / United States / Utah / Salt Lake City
Salt Lake City, month by month
Salt Lake City has a measured daily mean on 1,371 days since 1 January 2023. Its worst month was December 2023, at 60 US AQI (13.7 µg/m³), 331st of 2,247 cities on that month's world ranking. Its cleanest was March 2023, at 20 US AQI (3.6 µg/m³). 2025 averaged 39 US AQI (7.0 µg/m³), against 43 US AQI (7.7 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
Salt Lake City's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| December 2023 | 6013.7 µg/m³ | 331stof 2,247 | – |
| December 2024 | 5913.4 µg/m³ | 569thof 2,616 | – |
| February 2023 | 5813.0 µg/m³ | 479thof 1,129 | Utah and Idaho, United States, February 2023 |
| January 2026 | 5812.7 µg/m³ | 896thof 2,617 | – |
| July 2024 | 5712.2 µg/m³ | 402ndof 2,566 | North-western United States and Canada, July 2024 |
| November 2023 | 529.9 µg/m³ | 643rdof 2,243 | Utah and Idaho, United States, November 2023 |
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.
Salt Lake City's worst days
| Day | US AQI | Episode |
|---|---|---|
| 4 Feb 2023 | 11842.3 µg/m³ | Utah and Idaho, United States, February 2023 |
| 3 Feb 2023 | 11541.1 µg/m³ | Utah and Idaho, United States, February 2023 |
| 2 Feb 2023 | 10235.9 µg/m³ | Utah and Idaho, United States, February 2023 |
| 1 Jan 2024 | 10135.6 µg/m³ | – |
| 4 Dec 2024 | 9834.2 µg/m³ | – |
| 5 Dec 2024 | 9834.2 µg/m³ | – |
| 11 Sept 2024 | 9633.3 µg/m³ | North-western United States and Canada, 4 to 11 September 2024 |
| 17 Dec 2023 | 9231.2 µg/m³ | – |
| 3 Dec 2024 | 9231.0 µg/m³ | – |
| 14 Jan 2026 | 9130.6 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, Salt Lake City, 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/salt-lake-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.
Salt Lake City now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 02:07 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).