Hourly Weather | Today Thursday, May 21, 2026
Quincy, Massachusetts
12 PM
Cloudy Weather
64°
Feels Like 66°
34
Humidity: 42%
UV Index: 4
Wind: 9 mph
1 PM
Cloudy Weather
64°
Feels Like 66°
22
Humidity: 39%
UV Index: 4
Wind: 8 mph
2 PM
Cloudy Weather
64°
Feels Like 68°
0
Humidity: 39%
UV Index: 3
Wind: 8 mph
3 PM
Cloudy Weather
64°
Feels Like 68°
0
Humidity: 38%
UV Index: 3
Wind: 7 mph
4 PM
Cloudy Weather
64°
Feels Like 66°
0
Humidity: 38%
UV Index: 3
Wind: 7 mph
5 PM
Cloudy Weather
64°
Feels Like 68°
0
Humidity: 37%
UV Index: 3
Wind: 6 mph
6 PM
Cloudy Weather
64°
Feels Like 66°
0
Humidity: 39%
UV Index: 2
Wind: 6 mph
7 PM
Cloudy Weather
63°
Feels Like 63°
0
Humidity: 43%
UV Index: 1
Wind: 6 mph
8 PM
Cloudy Weather
61°
Feels Like 59°
0
Humidity: 49%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
57°
Feels Like 55°
0
Humidity: 55%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
55°
Feels Like 55°
0
Humidity: 60%
UV Index: 0
Wind: 5 mph
11 PM
Cloudy Night
55°
Feels Like 54°
0
Humidity: 62%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

12 PM
28 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.24 µg/m³
  • PM10: 1.84 µg/m³
  • O3: 0.030 ppm
  • NO2: 3.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

1 PM
29 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.45 µg/m³
  • PM10: 2.08 µg/m³
  • O3: 0.031 ppm
  • NO2: 3.1 ppb
  • SO2: 0.5 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

2 PM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.74 µg/m³
  • PM10: 2.4 µg/m³
  • O3: 0.033 ppm
  • NO2: 2.9 ppb
  • SO2: 0.5 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.09 µg/m³
  • PM10: 2.74 µg/m³
  • O3: 0.033 ppm
  • NO2: 2.9 ppb
  • SO2: 0.4 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

4 PM
29 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.4 µg/m³
  • PM10: 3.05 µg/m³
  • O3: 0.031 ppm
  • NO2: 3.1 ppb
  • SO2: 0.4 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.57 µg/m³
  • PM10: 3.22 µg/m³
  • O3: 0.030 ppm
  • NO2: 3.5 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.64 µg/m³
  • PM10: 3.32 µg/m³
  • O3: 0.028 ppm
  • NO2: 4.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.7 µg/m³
  • PM10: 3.42 µg/m³
  • O3: 0.026 ppm
  • NO2: 5 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.73 µg/m³
  • PM10: 3.51 µg/m³
  • O3: 0.024 ppm
  • NO2: 5.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.72 µg/m³
  • PM10: 3.55 µg/m³
  • O3: 0.023 ppm
  • NO2: 5.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.72 µg/m³
  • PM10: 3.63 µg/m³
  • O3: 0.022 ppm
  • NO2: 5.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.77 µg/m³
  • PM10: 3.75 µg/m³
  • O3: 0.021 ppm
  • NO2: 4.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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