Hourly Weather | Today Wednesday, August 12, 2026
Frederick, Maryland
9 AM
Foggy Weather
73°
Feels Like 81°
20
Humidity: 82%
UV Index: 3
Wind: 6 mph
10 AM
Foggy Weather
79°
Feels Like 84°
20
Humidity: 74%
UV Index: 4
Wind: 6 mph
11 AM
Foggy Weather
81°
Feels Like 90°
20
Humidity: 70%
UV Index: 6
Wind: 6 mph
12 PM
Foggy Weather
82°
Feels Like 93°
20
Humidity: 65%
UV Index: 8
Wind: 6 mph
1 PM
Foggy Weather
84°
Feels Like 97°
13
Humidity: 60%
UV Index: 9
Wind: 7 mph
2 PM
Cloudy Weather
84°
Feels Like 97°
0
Humidity: 57%
UV Index: 8
Wind: 7 mph
3 PM
Cloudy Weather
86°
Feels Like 95°
0
Humidity: 55%
UV Index: 6
Wind: 7 mph
4 PM
Cloudy Weather
88°
Feels Like 93°
0
Humidity: 52%
UV Index: 4
Wind: 8 mph
5 PM
Cloudy Weather
88°
Feels Like 91°
0
Humidity: 54%
UV Index: 3
Wind: 8 mph
6 PM
Cloudy Weather
84°
Feels Like 90°
0
Humidity: 56%
UV Index: 2
Wind: 8 mph
7 PM
Cloudy Weather
82°
Feels Like 86°
0
Humidity: 62%
UV Index: 1
Wind: 7 mph
8 PM
Cloudy Weather
81°
Feels Like 82°
7
Humidity: 71%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
79°
Feels Like 81°
7
Humidity: 79%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
75°
Feels Like 79°
7
Humidity: 86%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
73°
Feels Like 77°
7
Humidity: 93%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

9 AM
13 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 3.15 µg/m³
  • PM10: 4.14 µg/m³
  • O3: 0.013 ppm
  • NO2: 1.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

10 AM
16 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.07 µg/m³
  • PM10: 3.97 µg/m³
  • O3: 0.017 ppm
  • NO2: 1.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

11 AM
21 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.08 µg/m³
  • PM10: 3.86 µg/m³
  • O3: 0.022 ppm
  • NO2: 1.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.64 µg/m³
  • PM10: 3.12 µg/m³
  • O3: 0.032 ppm
  • NO2: 0.9 ppb
  • SO2: 0.3 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.3 µg/m³
  • PM10: 2.67 µg/m³
  • O3: 0.036 ppm
  • NO2: 0.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.17 µg/m³
  • PM10: 2.5 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.17 µg/m³
  • PM10: 2.45 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.38 µg/m³
  • PM10: 2.6 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.37 µg/m³
  • PM10: 2.56 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.35 µg/m³
  • PM10: 2.58 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.35 µg/m³
  • PM10: 2.68 µg/m³
  • O3: 0.038 ppm
  • NO2: 1.3 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.29 µg/m³
  • PM10: 2.73 µg/m³
  • O3: 0.033 ppm
  • NO2: 1.7 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.29 µg/m³
  • PM10: 2.95 µg/m³
  • O3: 0.025 ppm
  • NO2: 2 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.37 µg/m³
  • PM10: 3.41 µg/m³
  • O3: 0.017 ppm
  • NO2: 2.3 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.48 µg/m³
  • PM10: 3.9 µg/m³
  • O3: 0.012 ppm
  • NO2: 2.6 ppb
  • SO2: 0 ppb
  • CO: 0.13 ppm

Health Recommendations:

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