SmogRank / United States / Michigan / Wyoming
Wyoming, month by month
Wyoming has a measured daily mean on 947 days since 29 January 2024. Its worst month was July 2026, at 91 US AQI (30.5 µg/m³), 133rd of 2,784 cities on that month's world ranking. Its cleanest was November 2024, at 41 US AQI (7.3 µg/m³). 2025 averaged 55 US AQI (11.2 µg/m³), against 52 US AQI (9.4 µg/m³) in 2024.
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
2 months
| Month | Why |
|---|---|
| Mar 2024 | 19 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 11 with under 18 hours of readings or readings that failed our checks. |
| Jan 2024 | 3 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.
Wyoming's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2026 | 9130.5 µg/m³ | 133rdof 2,784 | Northern United States and Canada, July 2026 North-eastern United States, June and July 2026 |
| July 2025 | 6416.0 µg/m³ | 335thof 2,889 | North-eastern United States and Canada, 29 July to 9 August 2025 Northern United States, July 2025and 1 more |
| June 2025 | 6415.9 µg/m³ | 373rdof 2,508 | Northern United States and Canada, June 2025 Northern United States and Canada, May and June 2025 |
| August 2025 | 6315.3 µg/m³ | 332ndof 2,901 | North-eastern United States and Canada, 29 July to 9 August 2025 |
| August 2026 | 5813.1 µg/m³ | 483rdof 2,896 | – |
| February 2026 | 5812.7 µg/m³ | 955thof 2,866 | North-eastern United States and Canada, 14 to 19 February 2026 |
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.
Wyoming's worst days
| Day | US AQI | Episode |
|---|---|---|
| 16 Jul 2026 | 285210.0 µg/m³ | Northern United States and Canada, July 2026 |
| 17 Jul 2026 | 243168.0 µg/m³ | Northern United States and Canada, July 2026 |
| 31 Jul 2025 | 14854.7 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 20 Jul 2026 | 12947.0 µg/m³ | Northern United States and Canada, July 2026 |
| 19 Jul 2026 | 12746.0 µg/m³ | Northern United States and Canada, July 2026 |
| 3 Aug 2025 | 12444.7 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 5 Jun 2025 | 10838.2 µg/m³ | Northern United States and Canada, May and June 2025 |
| 5 Aug 2025 | 10537.2 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 18 Jul 2026 | 10135.6 µg/m³ | Northern United States and Canada, July 2026 |
| 15 Mar 2025 | 9935.0 µg/m³ | Eastern United States, March 2025 |
Daily means, the highest since 29 Jan 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, Wyoming, United States, 29 Jan 2024 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/wyoming/history (accessed 12 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.
Wyoming now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 23:07 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).