Hourly Weather | Today Wednesday, May 27, 2026
Cambridge, Massachusetts
9 AM
Cloudy Weather
70°
Feels Like 70°
0
Humidity: 66%
UV Index: 3
Wind: 9 mph
10 AM
Cloudy Weather
73°
Feels Like 75°
0
Humidity: 58%
UV Index: 5
Wind: 10 mph
11 AM
Cloudy Weather
77°
Feels Like 81°
0
Humidity: 51%
UV Index: 7
Wind: 10 mph
12 PM
Cloudy Weather
81°
Feels Like 86°
0
Humidity: 45%
UV Index: 9
Wind: 12 mph
1 PM
Cloudy Weather
86°
Feels Like 90°
0
Humidity: 39%
UV Index: 10
Wind: 12 mph
2 PM
Cloudy Weather
88°
Feels Like 90°
0
Humidity: 38%
UV Index: 9
Wind: 13 mph
3 PM
Cloudy Weather
90°
Feels Like 91°
0
Humidity: 35%
UV Index: 7
Wind: 13 mph
4 PM
Cloudy Weather
88°
Feels Like 88°
0
Humidity: 35%
UV Index: 5
Wind: 13 mph
5 PM
Cloudy Weather
88°
Feels Like 86°
0
Humidity: 34%
UV Index: 3
Wind: 13 mph
6 PM
Cloudy Weather
84°
Feels Like 84°
0
Humidity: 37%
UV Index: 2
Wind: 12 mph
7 PM
Cloudy Weather
82°
Feels Like 81°
0
Humidity: 41%
UV Index: 1
Wind: 10 mph
8 PM
Cloudy Weather
81°
Feels Like 77°
17
Humidity: 45%
UV Index: 0
Wind: 9 mph
9 PM
Cloudy Night
77°
Feels Like 73°
17
Humidity: 48%
UV Index: 0
Wind: 9 mph
10 PM
Cloudy Night
73°
Feels Like 72°
22
Humidity: 50%
UV Index: 0
Wind: 10 mph
11 PM
Rainy Weather
73°
Feels Like 66°
42
Humidity: 51%
UV Index: 0
Wind: 10 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 22.02 µg/m³
  • PM10: 25.05 µg/m³
  • O3: 0.032 ppm
  • NO2: 4.4 ppb
  • SO2: 0.7 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.

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

Pollutant Concentrations:

  • PM2.5: 20.97 µg/m³
  • PM10: 23.94 µg/m³
  • O3: 0.035 ppm
  • NO2: 4.2 ppb
  • SO2: 0.7 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.

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

Pollutant Concentrations:

  • PM2.5: 22.39 µg/m³
  • PM10: 25.31 µg/m³
  • O3: 0.043 ppm
  • NO2: 3.4 ppb
  • SO2: 0.8 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.

12 PM
77 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 24.51 µg/m³
  • PM10: 27.29 µg/m³
  • O3: 0.052 ppm
  • NO2: 2.5 ppb
  • SO2: 0.7 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.

1 PM
77 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 24.58 µg/m³
  • PM10: 27.31 µg/m³
  • O3: 0.053 ppm
  • NO2: 2.1 ppb
  • SO2: 0.7 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.

2 PM
76 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 24.29 µg/m³
  • PM10: 27.08 µg/m³
  • O3: 0.054 ppm
  • NO2: 2.1 ppb
  • SO2: 0.7 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.

3 PM
69 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 21.09 µg/m³
  • PM10: 23.75 µg/m³
  • O3: 0.052 ppm
  • NO2: 2.3 ppb
  • SO2: 0.6 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.

4 PM
61 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 17.31 µg/m³
  • PM10: 19.79 µg/m³
  • O3: 0.048 ppm
  • NO2: 2.8 ppb
  • SO2: 0.5 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.

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

Pollutant Concentrations:

  • PM2.5: 14.78 µg/m³
  • PM10: 17.08 µg/m³
  • O3: 0.043 ppm
  • NO2: 3.2 ppb
  • SO2: 0.5 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.

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

Pollutant Concentrations:

  • PM2.5: 13.93 µg/m³
  • PM10: 16.17 µg/m³
  • O3: 0.040 ppm
  • NO2: 3.8 ppb
  • SO2: 0.4 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.

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

Pollutant Concentrations:

  • PM2.5: 13.61 µg/m³
  • PM10: 15.86 µg/m³
  • O3: 0.038 ppm
  • NO2: 4.5 ppb
  • SO2: 0.4 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.

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

Pollutant Concentrations:

  • PM2.5: 13.17 µg/m³
  • PM10: 15.43 µg/m³
  • O3: 0.036 ppm
  • NO2: 5 ppb
  • SO2: 0.4 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.

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

Pollutant Concentrations:

  • PM2.5: 12.54 µg/m³
  • PM10: 14.78 µg/m³
  • O3: 0.035 ppm
  • NO2: 5.1 ppb
  • SO2: 0.4 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.

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

Pollutant Concentrations:

  • PM2.5: 11.51 µg/m³
  • PM10: 13.63 µg/m³
  • O3: 0.034 ppm
  • NO2: 5 ppb
  • SO2: 0.4 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.97 µg/m³
  • PM10: 11.83 µg/m³
  • O3: 0.034 ppm
  • NO2: 4.7 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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