SmogRank / United States / Utah / Cedar Hills
Cedar Hills, month by month
Cedar Hills has a measured daily mean on 1,233 days since 1 January 2023. Its worst month was July 2024, at 52 US AQI (9.4 µg/m³), 891st of 2,566 cities on that month's world ranking. Its cleanest was December 2025, at 20 US AQI (3.6 µg/m³). 2025 averaged 34 US AQI (6.1 µg/m³), against 34 US AQI (6.2 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
6 months
| Month | Why |
|---|---|
| Sep 2026 | 17 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Jan 2025 | 10 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Apr 2023 | 20 of 30 days measured; a month needs 21. The others: 3 missing from OpenAQ's archive, 7 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 9 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive, 2 with under 18 hours of readings or readings that failed our checks. |
| 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. |
| Jan 2023 | 20 of 31 days measured; a month needs 22. The others: 7 missing from OpenAQ's archive, 4 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.
Cedar Hills's worst months
| Month | US AQI | World rank |
|---|---|---|
| July 2024 | 529.4 µg/m³ | 891stof 2,566 |
| August 2025 | 447.9 µg/m³ | 1,855thof 2,901 |
| September 2024 | 437.8 µg/m³ | 903rdof 2,010 |
| August 2024 | 397.1 µg/m³ | 1,518thof 2,010 |
| June 2025 | 397.1 µg/m³ | 2,001stof 2,508 |
| August 2026 | 397.1 µg/m³ | 2,047thof 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.
Cedar Hills's worst days
| Day | US AQI | Episode |
|---|---|---|
| 30 Nov 2023 | 8728.2 µg/m³ | Utah and Idaho, United States, November 2023 |
| 11 Sept 2024 | 8024.6 µg/m³ | – |
| 23 Jun 2026 | 7823.8 µg/m³ | – |
| 20 May 2023 | 7522.0 µg/m³ | – |
| 1 Feb 2023 | 7321.1 µg/m³ | – |
| 24 Jun 2026 | 7220.5 µg/m³ | – |
| 1 Dec 2023 | 7220.2 µg/m³ | – |
| 28 Jan 2025 | 6617.3 µg/m³ | – |
| 31 Jul 2024 | 6617.0 µg/m³ | – |
| 22 Jun 2026 | 6516.8 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, Cedar Hills, 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/cedar-hills/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.
Cedar Hills 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).