SmogRank / United States / Wyoming / Worland
Worland, month by month
Worland has a measured daily mean on 879 days since 2 April 2024. Its worst month was August 2026, at 52 US AQI (9.6 µg/m³), 997th of 2,896 cities on that month's world ranking. Its cleanest was September 2026, at 9 US AQI (1.6 µg/m³). 2025 averaged 19 US AQI (3.4 µg/m³), against 23 US AQI (4.2 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 |
|---|---|
| Oct 2026 | 4 of 11 days measured; a month needs 8. The others: 7 with readings for part of the day (a day needs 18 hours). |
| Nov 2025 | 16 of 30 days measured; a month needs 21. The others: 9 with readings for part of the day (a day needs 18 hours), 5 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.
Worland's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| August 2026 | 529.6 µg/m³ | 997thof 2,896 | North-western United States and Canada, 4 to 22 August 2026 North-western United States and Canada, July and August 2026 |
| July 2024 | 488.6 µg/m³ | 1,137thof 2,566 | – |
| August 2025 | 336.0 µg/m³ | 2,510thof 2,901 | – |
| October 2024 | 295.3 µg/m³ | 1,706thof 2,020 | – |
| September 2024 | 285.1 µg/m³ | 1,743rdof 2,010 | – |
| August 2024 | 285.0 µg/m³ | 1,882ndof 2,010 | – |
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.
Worland's worst days
| Day | US AQI | Episode |
|---|---|---|
| 3 Aug 2026 | 10436.7 µg/m³ | North-western United States and Canada, July and August 2026 |
| 29 Sept 2024 | 10235.8 µg/m³ | – |
| 9 Aug 2026 | 8728.4 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 10 Aug 2026 | 8225.7 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 8 Aug 2026 | 8024.8 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 7 Aug 2026 | 7924.3 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 11 Aug 2026 | 7421.5 µg/m³ | North-western United States and Canada, 4 to 22 August 2026 |
| 23 Jul 2024 | 7119.9 µg/m³ | – |
| 22 Jul 2024 | 7019.5 µg/m³ | – |
| 15 Aug 2025 | 6717.9 µg/m³ | – |
Daily means, the highest since 2 Apr 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, Worland, United States, 2 Apr 2024 – 9 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/worland/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.
Worland now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 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).