Hourly Weather | Today Monday, September 21, 2026
Danbury, Connecticut
3 PM
Cloudy Weather
70°
Feels Like 72°
0
Humidity: 48%
UV Index: 4
Wind: 8 mph
4 PM
Cloudy Weather
68°
Feels Like 70°
0
Humidity: 51%
UV Index: 3
Wind: 8 mph
5 PM
Cloudy Weather
66°
Feels Like 66°
0
Humidity: 54%
UV Index: 2
Wind: 8 mph
6 PM
Cloudy Weather
66°
Feels Like 64°
0
Humidity: 58%
UV Index: 1
Wind: 7 mph
7 PM
Cloudy Night
63°
Feels Like 63°
0
Humidity: 67%
UV Index: 0
Wind: 6 mph
8 PM
Cloudy Night
61°
Feels Like 61°
0
Humidity: 71%
UV Index: 0
Wind: 5 mph
9 PM
Cloudy Night
59°
Feels Like 59°
0
Humidity: 76%
UV Index: 0
Wind: 5 mph
10 PM
Cloudy Night
57°
Feels Like 57°
0
Humidity: 77%
UV Index: 0
Wind: 5 mph
11 PM
Cloudy Weather
57°
Feels Like 55°
0
Humidity: 78%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 5.73 µg/m³
  • PM10: 7.89 µg/m³
  • O3: 0.041 ppm
  • NO2: 5 ppb
  • SO2: 1.3 ppb
  • CO: 0.20 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.03 µg/m³
  • PM10: 8.23 µg/m³
  • O3: 0.043 ppm
  • NO2: 5 ppb
  • SO2: 1.2 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.8 µg/m³
  • PM10: 8.07 µg/m³
  • O3: 0.043 ppm
  • NO2: 5.3 ppb
  • SO2: 1.1 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.42 µg/m³
  • PM10: 7.74 µg/m³
  • O3: 0.042 ppm
  • NO2: 6.1 ppb
  • SO2: 1.1 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.18 µg/m³
  • PM10: 7.59 µg/m³
  • O3: 0.040 ppm
  • NO2: 7.1 ppb
  • SO2: 1 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.09 µg/m³
  • PM10: 7.65 µg/m³
  • O3: 0.039 ppm
  • NO2: 7.5 ppb
  • SO2: 1 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.02 µg/m³
  • PM10: 7.81 µg/m³
  • O3: 0.038 ppm
  • NO2: 7.4 ppb
  • SO2: 1.1 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.99 µg/m³
  • PM10: 8.04 µg/m³
  • O3: 0.038 ppm
  • NO2: 7.2 ppb
  • SO2: 1.1 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.79 µg/m³
  • PM10: 7.94 µg/m³
  • O3: 0.038 ppm
  • NO2: 6.8 ppb
  • SO2: 1.1 ppb
  • CO: 0.20 ppm

Health Recommendations:

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