Air quality history by county in Guam
EPA reported a daily Air Quality Index for 1 county in Guam in at least one year from 1989 to 2025.
Select a county for its year-by-year AQI history, charts and data notes. Click a column heading to sort.
| Years covered | ||||||
|---|---|---|---|---|---|---|
| Guam | 1991 | 41 | 68% | 43 | 55 | 1989–1991 |
Latest year is the most recent year with at least 120 monitored days, or the most recent year available if none qualifies. Counties without EPA AQI monitoring do not appear.
Source: U.S. EPA AirData, “Annual AQI by County” files for 1989–1991 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem