Air quality in Roy estimated
Utah, United States. No ground monitor we can use is in this city, so these numbers are model estimates, not measurements.
≈ 4 µg/m³
Good
Estimated PM2.5, 7-day average to 2026-09-30, about 0.2× the WHO 24-hour guideline. 30-day average ≈ 4 µg/m³.
Model estimate from the Copernicus Atmosphere Monitoring Service (CAMS), scaled by 0.49 to match 10 measured cities within 300 km over the last week. Adjusted this way, a single day lands within ×1.5 of what a monitor would read about two times in three: a guide, not a measurement. Not ranked on SmogRank's boards.
Last 30 days, estimated
Daily means, UTC days. Dashed line: WHO 24-hour guideline (15 µg/m³).
Measured cities nearby
| City | Distance | 7-day average |
|---|---|---|
| North Ogden | 17 km | 4.5 µg/m³ |
| Bountiful | 33 km | 5.3 µg/m³ |
| Brigham City | 39 km | 5.0 µg/m³ |
| Salt Lake City | 46 km | 5.5 µg/m³ |
| Magna | 51 km | 5.1 µg/m³ |
| West Valley City | 52 km | 5.9 µg/m³ |
Estimates contain modified Copernicus Atmosphere Monitoring Service information 2026. How estimates are made.