Hourly Weather | Today Wednesday, March 18, 2026
Worcester, Massachusetts
1 PM
Cloudy Weather
30°
Feels Like 36°
0
Humidity: 26%
UV Index: 5
Wind: 7 mph
2 PM
Cloudy Weather
32°
Feels Like 41°
0
Humidity: 23%
UV Index: 4
Wind: 5 mph
3 PM
Cloudy Weather
34°
Feels Like 37°
0
Humidity: 22%
UV Index: 4
Wind: 6 mph
4 PM
Cloudy Weather
34°
Feels Like 34°
0
Humidity: 22%
UV Index: 3
Wind: 7 mph
5 PM
Cloudy Weather
34°
Feels Like 32°
0
Humidity: 23%
UV Index: 2
Wind: 7 mph
6 PM
Cloudy Weather
34°
Feels Like 30°
0
Humidity: 26%
UV Index: 1
Wind: 7 mph
7 PM
Cloudy Night
30°
Feels Like 28°
0
Humidity: 32%
UV Index: 0
Wind: 6 mph
8 PM
Cloudy Night
30°
Feels Like 28°
0
Humidity: 32%
UV Index: 0
Wind: 5 mph
9 PM
Cloudy Night
30°
Feels Like 27°
0
Humidity: 37%
UV Index: 0
Wind: 5 mph
10 PM
Cloudy Night
28°
Feels Like 25°
0
Humidity: 43%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
27°
Feels Like 23°
0
Humidity: 46%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 0.7 µg/m³
  • PM10: 1.25 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.94 µg/m³
  • PM10: 1.48 µg/m³
  • O3: 0.052 ppm
  • NO2: 1.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.34 µg/m³
  • PM10: 1.92 µg/m³
  • O3: 0.053 ppm
  • NO2: 1.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

4 PM
51 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.75 µg/m³
  • PM10: 2.42 µg/m³
  • O3: 0.054 ppm
  • NO2: 1.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.11 µg/m³
  • PM10: 2.92 µg/m³
  • O3: 0.054 ppm
  • NO2: 1.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.59 µg/m³
  • PM10: 3.68 µg/m³
  • O3: 0.052 ppm
  • NO2: 2.6 ppb
  • SO2: 0.3 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.16 µg/m³
  • PM10: 4.63 µg/m³
  • O3: 0.047 ppm
  • NO2: 4.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.73 µg/m³
  • PM10: 5.62 µg/m³
  • O3: 0.044 ppm
  • NO2: 5.7 ppb
  • SO2: 0.4 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.19 µg/m³
  • PM10: 6.33 µg/m³
  • O3: 0.043 ppm
  • NO2: 5.9 ppb
  • SO2: 0.4 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.53 µg/m³
  • PM10: 6.78 µg/m³
  • O3: 0.042 ppm
  • NO2: 5.7 ppb
  • SO2: 0.4 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.88 µg/m³
  • PM10: 7.25 µg/m³
  • O3: 0.041 ppm
  • NO2: 5.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.19 ppm

Health Recommendations:

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