SmogRank / United States / Utah / Roosevelt
Roosevelt, month by month
Roosevelt has a measured daily mean on 1,297 days since 1 January 2023. Its worst month was January 2023, at 66 US AQI (17.3 µg/m³), 196th of 1,261 cities on that month's world ranking. Its cleanest was March 2024, at 14 US AQI (2.5 µg/m³). 2025 averaged 34 US AQI (6.1 µg/m³), against 34 US AQI (6.1 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
3 months
| Month | Why |
|---|---|
| Nov 2025 | 15 of 30 days measured; a month needs 21. The others: 3 with no readings from the monitor, 12 with readings for part of the day (a day needs 18 hours). |
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Roosevelt's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2023 | 6617.3 µg/m³ | 196thof 1,261 | – |
| October 2024 | 5410.9 µg/m³ | 455thof 2,020 | North-western United States, October 2024 |
| June 2026 | 5310.1 µg/m³ | 648thof 2,497 | Utah and Colorado, United States, June 2026 |
| June 2025 | 529.6 µg/m³ | 1,419thof 2,508 | – |
| July 2025 | 529.5 µg/m³ | 1,397thof 2,889 | – |
| July 2026 | 529.5 µg/m³ | 1,493rdof 2,784 | – |
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.
Roosevelt's worst days
| Day | US AQI | Episode |
|---|---|---|
| 5 Oct 2024 | 15967.1 µg/m³ | – |
| 24 Jan 2023 | 10436.6 µg/m³ | – |
| 24 Jun 2026 | 10235.9 µg/m³ | Utah and Colorado, United States, June 2026 |
| 30 Jan 2025 | 9935.1 µg/m³ | – |
| 12 Oct 2024 | 9834.4 µg/m³ | – |
| 23 Jan 2023 | 9733.7 µg/m³ | – |
| 14 Feb 2023 | 9532.9 µg/m³ | – |
| 6 Oct 2024 | 9532.6 µg/m³ | North-western United States, October 2024 |
| 27 Jan 2023 | 9331.8 µg/m³ | – |
| 29 Jan 2025 | 9231.0 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, Roosevelt, 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/roosevelt-utah/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.
Roosevelt now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 01:07 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).