Chicago
Thursday, October 23, 2025
Air Quality Index
Current air quality conditions and pollutant levels
1
Good
Air Quality Scale
0-50
Good
51-100
Moderate
101-150
Unhealthy for Sensitive Groups
151-200
Unhealthy
201-300
Very Unhealthy
301-500
Hazardous
Pollutant Levels
| Pollutant | Current Level | Health Impact |
|---|---|---|
| Carbon Monoxide (CO) | 187.85 μg/m³ | Variable |
| Nitrogen Dioxide (NO2) | 10.15 μg/m³ | Variable |
| Ozone (O3) | 44.00 μg/m³ | Low |
| Sulfur Dioxide (SO2) | 3.45 μg/m³ | Variable |
| PM2.5 | 3.1 μg/m³ | Low |
| PM10 | 3.1 μg/m³ | Low |
Health Recommendations
Good Air Quality
- • Air quality is excellent for outdoor activities
- • No health precautions necessary
- • Enjoy outdoor exercise and activities