Hourly Weather | Today Thursday, June 4, 2026
Boston, Massachusetts
8 AM
Cloudy Weather
66°
Feels Like 68°
0
Humidity: 54%
UV Index: 2
Wind: 7 mph
9 AM
Cloudy Weather
72°
Feels Like 73°
0
Humidity: 48%
UV Index: 3
Wind: 7 mph
10 AM
Cloudy Weather
75°
Feels Like 81°
0
Humidity: 42%
UV Index: 5
Wind: 7 mph
11 AM
Cloudy Weather
81°
Feels Like 86°
0
Humidity: 37%
UV Index: 7
Wind: 7 mph
12 PM
Sunny Weather
82°
Feels Like 90°
0
Humidity: 34%
UV Index: 9
Wind: 8 mph
1 PM
Sunny Weather
84°
Feels Like 91°
0
Humidity: 32%
UV Index: 10
Wind: 8 mph
2 PM
Sunny Weather
86°
Feels Like 91°
0
Humidity: 30%
UV Index: 9
Wind: 8 mph
3 PM
Cloudy Weather
88°
Feels Like 91°
0
Humidity: 29%
UV Index: 7
Wind: 9 mph
4 PM
Cloudy Weather
88°
Feels Like 90°
0
Humidity: 27%
UV Index: 5
Wind: 10 mph
5 PM
Cloudy Weather
88°
Feels Like 88°
0
Humidity: 29%
UV Index: 3
Wind: 10 mph
6 PM
Cloudy Weather
84°
Feels Like 84°
0
Humidity: 31%
UV Index: 2
Wind: 10 mph
7 PM
Cloudy Weather
82°
Feels Like 81°
0
Humidity: 35%
UV Index: 1
Wind: 10 mph
8 PM
Cloudy Weather
81°
Feels Like 77°
0
Humidity: 39%
UV Index: 0
Wind: 10 mph
9 PM
Cloudy Night
77°
Feels Like 73°
0
Humidity: 44%
UV Index: 0
Wind: 9 mph
10 PM
Cloudy Night
73°
Feels Like 72°
0
Humidity: 49%
UV Index: 0
Wind: 8 mph
11 PM
Cloudy Night
72°
Feels Like 68°
0
Humidity: 54%
UV Index: 0
Wind: 8 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 14.79 µg/m³
  • PM10: 18.36 µg/m³
  • O3: 0.038 ppm
  • NO2: 3.6 ppb
  • SO2: 1 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 15.39 µg/m³
  • PM10: 19.05 µg/m³
  • O3: 0.043 ppm
  • NO2: 3.8 ppb
  • SO2: 1.2 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 17.6 µg/m³
  • PM10: 21.33 µg/m³
  • O3: 0.051 ppm
  • NO2: 3.4 ppb
  • SO2: 1.3 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.

11 AM
79 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 21.71 µg/m³
  • PM10: 25.49 µg/m³
  • O3: 0.063 ppm
  • NO2: 2.5 ppb
  • SO2: 1.3 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.

12 PM
113 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 22.01 µg/m³
  • PM10: 25.42 µg/m³
  • O3: 0.074 ppm
  • NO2: 1.2 ppb
  • SO2: 1.2 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 22.99 µg/m³
  • PM10: 26.33 µg/m³
  • O3: 0.078 ppm
  • NO2: 0.8 ppb
  • SO2: 1.1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 23.36 µg/m³
  • PM10: 26.65 µg/m³
  • O3: 0.080 ppm
  • NO2: 0.6 ppb
  • SO2: 1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

3 PM
133 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 21.65 µg/m³
  • PM10: 24.68 µg/m³
  • O3: 0.080 ppm
  • NO2: 0.6 ppb
  • SO2: 0.8 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

4 PM
133 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 20.09 µg/m³
  • PM10: 22.99 µg/m³
  • O3: 0.080 ppm
  • NO2: 0.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

5 PM
133 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 18.54 µg/m³
  • PM10: 21.45 µg/m³
  • O3: 0.080 ppm
  • NO2: 0.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 17 µg/m³
  • PM10: 20.01 µg/m³
  • O3: 0.078 ppm
  • NO2: 0.9 ppb
  • SO2: 0.6 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 15.35 µg/m³
  • PM10: 18.57 µg/m³
  • O3: 0.074 ppm
  • NO2: 1.3 ppb
  • SO2: 0.6 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 13.49 µg/m³
  • PM10: 16.91 µg/m³
  • O3: 0.070 ppm
  • NO2: 1.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 11.62 µg/m³
  • PM10: 15.2 µg/m³
  • O3: 0.066 ppm
  • NO2: 1.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

10 PM
78 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 10.36 µg/m³
  • PM10: 14.2 µg/m³
  • O3: 0.063 ppm
  • NO2: 1.2 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

11 PM
71 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.43 µg/m³
  • PM10: 13.44 µg/m³
  • O3: 0.061 ppm
  • NO2: 1.1 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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