Air Quality History for Chicago, United States
Historical PM2.5 and AQI trend from monitoring stations near Chicago, United States.
41
Current AQI
Good Station
Good Station
Air Quality Index Station
20hPM2.5 Station
20h · 1 stationTemperature GFS model
28ptPrecipitation GFS model
mm/dayDaily Summary Station
| Date | AQI | Range | PM2.5 avg | PM10 avg | Hours | Stations |
|---|---|---|---|---|---|---|
| 2026-10-20 | 4 | 4–5 | 1.1 µg/m³ | 1.1 | 4h | 1 |
| 2026-10-19 | 10 | 4–16 | 2.4 µg/m³ | 3.4 | 3h | 1 |
| 2026-10-17 | 11 | 1–21 | 2.6 µg/m³ | 4.5 | 2h | 1 |
| 2026-10-16 | 4 | 4–4 | 1.0 µg/m³ | 1.1 | 1h | 1 |
| 2026-10-15 | 6 | 6–6 | 1.4 µg/m³ | 1.6 | 1h | 1 |
| 2026-10-14 | 9 | 1–25 | 2.1 µg/m³ | 2.4 | 9h | 1 |