Hourly Weather | Today Tuesday, September 1, 2026
Norwalk, Connecticut
12 PM
Rainy Weather
75°
Feels Like 79°
79
Humidity: 87%
UV Index: 1
Wind: 7 mph
1 PM
Cloudy Weather
77°
Feels Like 84°
49
Humidity: 84%
UV Index: 2
Wind: 8 mph
2 PM
Cloudy Weather
79°
Feels Like 84°
34
Humidity: 82%
UV Index: 2
Wind: 8 mph
3 PM
Cloudy Weather
79°
Feels Like 84°
34
Humidity: 80%
UV Index: 2
Wind: 9 mph
4 PM
Cloudy Weather
77°
Feels Like 82°
39
Humidity: 86%
UV Index: 1
Wind: 9 mph
5 PM
Cloudy Weather
75°
Feels Like 81°
49
Humidity: 91%
UV Index: 1
Wind: 9 mph
6 PM
Stormy Weather
75°
Feels Like 75°
61
Humidity: 91%
UV Index: 0
Wind: 8 mph
7 PM
Cloudy Weather
73°
Feels Like 79°
49
Humidity: 92%
UV Index: 0
Wind: 8 mph
8 PM
Cloudy Weather
73°
Feels Like 75°
34
Humidity: 91%
UV Index: 0
Wind: 12 mph
9 PM
Cloudy Weather
72°
Feels Like 72°
34
Humidity: 96%
UV Index: 0
Wind: 10 mph
10 PM
Cloudy Weather
70°
Feels Like 70°
40
Humidity: 95%
UV Index: 0
Wind: 10 mph
11 PM
Stormy Weather
68°
Feels Like 64°
70
Humidity: 96%
UV Index: 0
Wind: 9 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 10.63 µg/m³
  • PM10: 11.97 µg/m³
  • O3: 0.036 ppm
  • NO2: 4.7 ppb
  • SO2: 0.9 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.92 µg/m³
  • PM10: 12.09 µg/m³
  • O3: 0.040 ppm
  • NO2: 4 ppb
  • SO2: 0.8 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 11.09 µg/m³
  • PM10: 12.19 µg/m³
  • O3: 0.043 ppm
  • NO2: 3.6 ppb
  • SO2: 0.8 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 11.2 µg/m³
  • PM10: 12.26 µg/m³
  • O3: 0.045 ppm
  • NO2: 3.5 ppb
  • SO2: 0.8 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 11.38 µg/m³
  • PM10: 12.46 µg/m³
  • O3: 0.045 ppm
  • NO2: 3.7 ppb
  • SO2: 0.8 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 11.94 µg/m³
  • PM10: 13.13 µg/m³
  • O3: 0.045 ppm
  • NO2: 4.2 ppb
  • SO2: 0.8 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

6 PM
52 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.76 µg/m³
  • PM10: 14.04 µg/m³
  • O3: 0.044 ppm
  • NO2: 5 ppb
  • SO2: 0.8 ppb
  • CO: 0.17 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

7 PM
54 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.66 µg/m³
  • PM10: 14.93 µg/m³
  • O3: 0.040 ppm
  • NO2: 6.2 ppb
  • SO2: 0.9 ppb
  • CO: 0.18 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

8 PM
55 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.5 µg/m³
  • PM10: 15.64 µg/m³
  • O3: 0.037 ppm
  • NO2: 6.9 ppb
  • SO2: 0.9 ppb
  • CO: 0.19 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

9 PM
57 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 15.14 µg/m³
  • PM10: 16.18 µg/m³
  • O3: 0.034 ppm
  • NO2: 7.4 ppb
  • SO2: 0.9 ppb
  • CO: 0.19 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

10 PM
57 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 15.36 µg/m³
  • PM10: 16.55 µg/m³
  • O3: 0.029 ppm
  • NO2: 8.3 ppb
  • SO2: 0.9 ppb
  • CO: 0.20 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

11 PM
56 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 15.03 µg/m³
  • PM10: 16.36 µg/m³
  • O3: 0.024 ppm
  • NO2: 9.7 ppb
  • SO2: 0.9 ppb
  • CO: 0.21 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.