Hourly Weather | Today Saturday, April 4, 2026
Chicago, Illinois
9 PM
Cloudy Night
45°
Feels Like 34°
37
Humidity: 66%
UV Index: 0
Wind: 16 mph
10 PM
Cloudy Night
45°
Feels Like 34°
33
Humidity: 67%
UV Index: 0
Wind: 15 mph
11 PM
Cloudy Night
43°
Feels Like 32°
32
Humidity: 69%
UV Index: 0
Wind: 16 mph

Hourly Air Quality Forecast - AQI (US EPA)

9 PM
45 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.61 µg/m³
  • PM10: 0.76 µg/m³
  • O3: 0.049 ppm
  • NO2: 0.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM
47 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.62 µg/m³
  • O3: 0.051 ppm
  • NO2: 0.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM
48 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.53 µg/m³
  • O3: 0.052 ppm
  • NO2: 0.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.