Air Quality History for Boulder, United States
Historical PM2.5 and AQI trend from monitoring stations near Boulder, United States.
2
Current AQI
Good Station
Good Station
Air Quality Index Station
74hPM2.5 Station
74h · 1 stationTemperature GFS model
80ptPrecipitation GFS model
mm/dayDaily Summary Station
| Date | AQI | Range | PM2.5 avg | PM10 avg | Hours | Stations |
|---|---|---|---|---|---|---|
| 2026-06-09 | 2 | 2–2 | 0.4 µg/m³ | 2.0 | 1h | 1 |
| 2026-06-08 | 16 | 9–24 | 3.8 µg/m³ | 4.1 | 4h | 1 |
| 2026-06-07 | 4 | 4–5 | 1.0 µg/m³ | 1.0 | 4h | 1 |
| 2026-06-06 | 8 | 3–24 | 2.0 µg/m³ | 2.4 | 10h | 1 |
| 2026-06-05 | 8 | 6–11 | 1.8 µg/m³ | 1.8 | 4h | 1 |
| 2026-06-03 | 10 | 5–15 | 2.3 µg/m³ | 2.4 | 2h | 1 |
| 2026-06-02 | 7 | 1–21 | 1.6 µg/m³ | 2.2 | 6h | 1 |
| 2026-06-01 | 5 | 5–5 | 1.2 µg/m³ | 1.3 | 1h | 1 |
| 2026-05-29 | 23 | 2–43 | 5.5 µg/m³ | 6.6 | 8h | 1 |
| 2026-05-28 | 17 | 4–51 | 3.7 µg/m³ | 4.4 | 10h | 1 |
| 2026-05-27 | 2 | 2–2 | 0.5 µg/m³ | 1.0 | 1h | 1 |
| 2026-05-26 | 4 | 3–4 | 0.8 µg/m³ | 1.1 | 6h | 1 |
| 2026-05-23 | 15 | 11–19 | 3.7 µg/m³ | 4.2 | 2h | 1 |
| 2026-05-22 | 6 | 6–6 | 1.3 µg/m³ | 2.2 | 2h | 1 |
| 2026-05-21 | 24 | 6–38 | 5.7 µg/m³ | 6.0 | 6h | 1 |
| 2026-05-20 | 10 | 2–27 | 2.3 µg/m³ | 2.9 | 7h | 1 |