SmogRank / Countries / United States / Wyoming

Most polluted cities in Wyoming, United States

3 measured cities, last 24 hours; 0 above the WHO 24-hour guideline. Worst: Sheridan at 4.0 µg/m³, #1,155 in the world.

3 good

  1. 1Sheridan 4.00.3×
  2. 2Casper 3.60.2×
  3. 3Cheyenne 3.00.2×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

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SmogRank, most polluted cities in Wyoming, United States, PM2.5, last 24 hours to 2 Oct 2026, 00:00 UTC, smogrank.com/us/region/wyoming.

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Updated 2026-10-02 00:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.