Hourly Weather | Today Thursday, December 4, 2025
Chicago, Illinois
4 AM
Cloudy Night
12°
Feels Like -6°
0
Humidity: 80%
Wind: 14 mph
UV Index: 0
5 AM
Night
10°
Feels Like -8°
0
Humidity: 81%
Wind: 14 mph
UV Index: 0
6 AM
Night
10°
Feels Like -8°
0
Humidity: 82%
Wind: 14 mph
UV Index: 0
7 AM
Cloudy Night
Feels Like -8°
0
Humidity: 86%
Wind: 13 mph
UV Index: 0
8 AM
Cloudy Weather
Feels Like -8°
0
Humidity: 91%
Wind: 12 mph
UV Index: 0
9 AM
Cloudy Weather
10°
Feels Like -2°
0
Humidity: 87%
Wind: 12 mph
UV Index: 1
10 AM
Cloudy Weather
12°
Feels Like
0
Humidity: 81%
Wind: 10 mph
UV Index: 2
11 AM
Cloudy Weather
16°
Feels Like 10°
0
Humidity: 76%
Wind: 8 mph
UV Index: 2
12 PM
Cloudy Weather
16°
Feels Like 12°
0
Humidity: 76%
Wind: 7 mph
UV Index: 2
1 PM
Cloudy Weather
16°
Feels Like 16°
0
Humidity: 74%
Wind: 6 mph
UV Index: 2
2 PM
Cloudy Weather
18°
Feels Like 18°
0
Humidity: 72%
Wind: 6 mph
UV Index: 2
3 PM
Cloudy Weather
16°
Feels Like 14°
0
Humidity: 76%
Wind: 6 mph
UV Index: 1
4 PM
Cloudy Weather
14°
Feels Like
0
Humidity: 81%
Wind: 7 mph
UV Index: 0
5 PM
Cloudy Night
12°
Feels Like
0
Humidity: 86%
Wind: 8 mph
UV Index: 0
6 PM
Cloudy Night
10°
Feels Like
0
Humidity: 90%
Wind: 8 mph
UV Index: 0
7 PM
Cloudy Night
10°
Feels Like -2°
0
Humidity: 91%
Wind: 9 mph
UV Index: 0
8 PM
Cloudy Night
Feels Like -4°
0
Humidity: 89%
Wind: 9 mph
UV Index: 0
9 PM
Cloudy Night
Feels Like -6°
0
Humidity: 87%
Wind: 10 mph
UV Index: 0
10 PM
Night
Feels Like -6°
0
Humidity: 85%
Wind: 10 mph
UV Index: 0
11 PM
Night
Feels Like -8°
0
Humidity: 84%
Wind: 10 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

4 AM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.99 µg/m³
  • PM10: 2.26 µg/m³
  • O3: 0.033 ppm
  • NO2: 2.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

5 AM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.32 µg/m³
  • PM10: 2.6 µg/m³
  • O3: 0.032 ppm
  • NO2: 2.7 ppb
  • SO2: 0.5 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

6 AM
29 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.59 µg/m³
  • PM10: 2.88 µg/m³
  • O3: 0.032 ppm
  • NO2: 2.8 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

7 AM
29 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.74 µg/m³
  • PM10: 3.06 µg/m³
  • O3: 0.031 ppm
  • NO2: 3.1 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

8 AM
29 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.89 µg/m³
  • PM10: 3.27 µg/m³
  • O3: 0.031 ppm
  • NO2: 3.8 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

9 AM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.08 µg/m³
  • PM10: 3.54 µg/m³
  • O3: 0.032 ppm
  • NO2: 3.7 ppb
  • SO2: 0.7 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

10 AM
31 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.41 µg/m³
  • PM10: 3.97 µg/m³
  • O3: 0.033 ppm
  • NO2: 3.4 ppb
  • SO2: 0.7 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

11 AM
32 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.14 µg/m³
  • PM10: 4.82 µg/m³
  • O3: 0.034 ppm
  • NO2: 3.5 ppb
  • SO2: 0.8 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

12 PM
32 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.24 µg/m³
  • PM10: 6.05 µg/m³
  • O3: 0.035 ppm
  • NO2: 3.7 ppb
  • SO2: 0.9 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

1 PM
33 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.71 µg/m³
  • PM10: 7.61 µg/m³
  • O3: 0.035 ppm
  • NO2: 4.4 ppb
  • SO2: 0.9 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

2 PM
34 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 8.11 µg/m³
  • PM10: 9.03 µg/m³
  • O3: 0.035 ppm
  • NO2: 5.6 ppb
  • SO2: 0.8 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

3 PM
38 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.03 µg/m³
  • PM10: 9.97 µg/m³
  • O3: 0.033 ppm
  • NO2: 7.8 ppb
  • SO2: 0.7 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

4 PM
40 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.61 µg/m³
  • PM10: 10.56 µg/m³
  • O3: 0.029 ppm
  • NO2: 11.4 ppb
  • SO2: 0.7 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

5 PM
42 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.02 µg/m³
  • PM10: 10.98 µg/m³
  • O3: 0.026 ppm
  • NO2: 14.3 ppb
  • SO2: 0.6 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

6 PM
43 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.38 µg/m³
  • PM10: 11.29 µg/m³
  • O3: 0.024 ppm
  • NO2: 15.3 ppb
  • SO2: 0.6 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

7 PM
44 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.6 µg/m³
  • PM10: 11.39 µg/m³
  • O3: 0.023 ppm
  • NO2: 15.3 ppb
  • SO2: 0.5 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

8 PM
45 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.76 µg/m³
  • PM10: 11.49 µg/m³
  • O3: 0.022 ppm
  • NO2: 15 ppb
  • SO2: 0.5 ppb
  • CO: 0.26 ppm

Health Recommendations:

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

9 PM
45 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.76 µg/m³
  • PM10: 11.31 µg/m³
  • O3: 0.022 ppm
  • NO2: 14.6 ppb
  • SO2: 0.4 ppb
  • CO: 0.26 ppm

Health Recommendations:

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

10 PM
45 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.82 µg/m³
  • PM10: 11.19 µg/m³
  • O3: 0.021 ppm
  • NO2: 14.2 ppb
  • SO2: 0.4 ppb
  • CO: 0.26 ppm

Health Recommendations:

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

11 PM
45 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.7 µg/m³
  • PM10: 10.98 µg/m³
  • O3: 0.021 ppm
  • NO2: 13.6 ppb
  • SO2: 0.5 ppb
  • CO: 0.25 ppm

Health Recommendations:

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