Hourly Weather | Today Tuesday, April 28, 2026
Hartford, Connecticut
5 AM
Cloudy Night
39°
Feels Like 39°
0
Humidity: 98%
UV Index: 0
Wind: 4 mph
6 AM
Sunny Weather
43°
Feels Like 43°
0
Humidity: 90%
UV Index: 0
Wind: 4 mph
7 AM
Sunny Weather
45°
Feels Like 48°
0
Humidity: 81%
UV Index: 1
Wind: 4 mph
8 AM
Cloudy Weather
48°
Feels Like 54°
0
Humidity: 72%
UV Index: 2
Wind: 4 mph
9 AM
Cloudy Weather
54°
Feels Like 61°
0
Humidity: 59%
UV Index: 3
Wind: 4 mph
10 AM
Cloudy Weather
57°
Feels Like 66°
0
Humidity: 48%
UV Index: 4
Wind: 5 mph
11 AM
Cloudy Weather
61°
Feels Like 72°
0
Humidity: 42%
UV Index: 6
Wind: 5 mph
12 PM
Cloudy Weather
64°
Feels Like 75°
0
Humidity: 38%
UV Index: 7
Wind: 6 mph
1 PM
Cloudy Weather
66°
Feels Like 75°
0
Humidity: 35%
UV Index: 8
Wind: 7 mph
2 PM
Cloudy Weather
70°
Feels Like 75°
0
Humidity: 33%
UV Index: 7
Wind: 7 mph
3 PM
Cloudy Weather
70°
Feels Like 75°
0
Humidity: 31%
UV Index: 6
Wind: 8 mph
4 PM
Cloudy Weather
70°
Feels Like 72°
0
Humidity: 32%
UV Index: 4
Wind: 8 mph
5 PM
Cloudy Weather
68°
Feels Like 70°
0
Humidity: 34%
UV Index: 3
Wind: 9 mph
6 PM
Cloudy Weather
66°
Feels Like 66°
0
Humidity: 36%
UV Index: 2
Wind: 9 mph
7 PM
Cloudy Weather
63°
Feels Like 63°
0
Humidity: 42%
UV Index: 1
Wind: 8 mph
8 PM
Cloudy Night
61°
Feels Like 57°
0
Humidity: 48%
UV Index: 0
Wind: 8 mph
9 PM
Cloudy Night
57°
Feels Like 54°
0
Humidity: 51%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Night
54°
Feels Like 52°
0
Humidity: 54%
UV Index: 0
Wind: 7 mph
11 PM
Cloudy Night
52°
Feels Like 50°
0
Humidity: 56%
UV Index: 0
Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

5 AM
51 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.39 µg/m³
  • PM10: 20.36 µg/m³
  • O3: 0.022 ppm
  • NO2: 20.3 ppb
  • SO2: 1.2 ppb
  • CO: 0.28 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 12.74 µg/m³
  • PM10: 20.51 µg/m³
  • O3: 0.021 ppm
  • NO2: 21.9 ppb
  • SO2: 1.6 ppb
  • CO: 0.28 ppm

Health Recommendations:

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

7 AM
52 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.1 µg/m³
  • PM10: 21.22 µg/m³
  • O3: 0.021 ppm
  • NO2: 24 ppb
  • SO2: 1.8 ppb
  • CO: 0.29 ppm

Health Recommendations:

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

8 AM
54 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.85 µg/m³
  • PM10: 22.81 µg/m³
  • O3: 0.024 ppm
  • NO2: 22.7 ppb
  • SO2: 1.9 ppb
  • CO: 0.31 ppm

Health Recommendations:

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

9 AM
58 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 15.74 µg/m³
  • PM10: 25.63 µg/m³
  • O3: 0.027 ppm
  • NO2: 21.6 ppb
  • SO2: 2 ppb
  • CO: 0.34 ppm

Health Recommendations:

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

10 AM
66 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 19.44 µg/m³
  • PM10: 29.97 µg/m³
  • O3: 0.032 ppm
  • NO2: 21.5 ppb
  • SO2: 2.3 ppb
  • CO: 0.35 ppm

Health Recommendations:

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

11 AM
81 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 26.4 µg/m³
  • PM10: 37.19 µg/m³
  • O3: 0.044 ppm
  • NO2: 21.5 ppb
  • SO2: 2.8 ppb
  • CO: 0.36 ppm

Health Recommendations:

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

12 PM
69 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 17.82 µg/m³
  • PM10: 23.99 µg/m³
  • O3: 0.060 ppm
  • NO2: 9.8 ppb
  • SO2: 1.8 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

1 PM
106 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 22.5 µg/m³
  • PM10: 28.02 µg/m³
  • O3: 0.072 ppm
  • NO2: 6.2 ppb
  • SO2: 1.5 ppb
  • CO: 0.21 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

2 PM
143 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 28.83 µg/m³
  • PM10: 34.19 µg/m³
  • O3: 0.083 ppm
  • NO2: 4.1 ppb
  • SO2: 1.5 ppb
  • CO: 0.21 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

3 PM
160 AQI
Unhealthy air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 32.4 µg/m³
  • PM10: 37.55 µg/m³
  • O3: 0.089 ppm
  • NO2: 2.9 ppb
  • SO2: 1.5 ppb
  • CO: 0.21 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

4 PM
161 AQI
Unhealthy air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 33.15 µg/m³
  • PM10: 38.14 µg/m³
  • O3: 0.089 ppm
  • NO2: 2.6 ppb
  • SO2: 1.5 ppb
  • CO: 0.21 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

5 PM
151 AQI
Unhealthy air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 31.26 µg/m³
  • PM10: 35.99 µg/m³
  • O3: 0.086 ppm
  • NO2: 2.8 ppb
  • SO2: 1.3 ppb
  • CO: 0.21 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

6 PM
130 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 28.7 µg/m³
  • PM10: 33.39 µg/m³
  • O3: 0.079 ppm
  • NO2: 4.3 ppb
  • SO2: 1.3 ppb
  • CO: 0.21 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

7 PM
108 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 26.72 µg/m³
  • PM10: 31.56 µg/m³
  • O3: 0.072 ppm
  • NO2: 5.8 ppb
  • SO2: 1.3 ppb
  • CO: 0.22 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

8 PM
91 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 24.94 µg/m³
  • PM10: 29.83 µg/m³
  • O3: 0.067 ppm
  • NO2: 6.2 ppb
  • SO2: 1.2 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.

9 PM
76 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 22.51 µg/m³
  • PM10: 27.29 µg/m³
  • O3: 0.062 ppm
  • NO2: 5.9 ppb
  • SO2: 1 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.

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

Pollutant Concentrations:

  • PM2.5: 20.12 µg/m³
  • PM10: 24.89 µg/m³
  • O3: 0.059 ppm
  • NO2: 5.8 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
62 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 17.78 µg/m³
  • PM10: 22.49 µg/m³
  • O3: 0.056 ppm
  • NO2: 5.7 ppb
  • SO2: 0.8 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.