Hourly Weather | Today Wednesday, May 20, 2026
Decatur, Illinois
8 PM
Cloudy Weather
64°
Feels Like 61°
0
Humidity: 59%
UV Index: 0
Wind: 12 mph
9 PM
Cloudy Night
61°
Feels Like 57°
0
Humidity: 61%
UV Index: 0
Wind: 10 mph
10 PM
Cloudy Night
57°
Feels Like 54°
0
Humidity: 62%
UV Index: 0
Wind: 10 mph
11 PM
Cloudy Night
55°
Feels Like 52°
0
Humidity: 64%
UV Index: 0
Wind: 9 mph

Hourly Air Quality Forecast - AQI (US EPA)

8 PM
40 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.21 µg/m³
  • PM10: 6.72 µg/m³
  • O3: 0.043 ppm
  • NO2: 1.6 ppb
  • SO2: 0.8 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.13 µg/m³
  • PM10: 6.64 µg/m³
  • O3: 0.042 ppm
  • NO2: 1.6 ppb
  • SO2: 0.8 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.85 µg/m³
  • PM10: 6.32 µg/m³
  • O3: 0.041 ppm
  • NO2: 1.6 ppb
  • SO2: 0.8 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.34 µg/m³
  • PM10: 5.77 µg/m³
  • O3: 0.040 ppm
  • NO2: 1.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.12 ppm

Health Recommendations:

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