Hourly Weather | Today Thursday, May 21, 2026
Pittsburgh, Pennsylvania
12 PM
Cloudy Weather
61°
Feels Like 70°
34
Humidity: 71%
UV Index: 9
Wind: 8 mph
1 PM
Cloudy Weather
63°
Feels Like 72°
27
Humidity: 59%
UV Index: 10
Wind: 8 mph
2 PM
Cloudy Weather
64°
Feels Like 73°
13
Humidity: 57%
UV Index: 9
Wind: 8 mph
3 PM
Cloudy Weather
64°
Feels Like 72°
13
Humidity: 57%
UV Index: 7
Wind: 8 mph
4 PM
Cloudy Weather
64°
Feels Like 70°
13
Humidity: 57%
UV Index: 5
Wind: 8 mph
5 PM
Cloudy Weather
64°
Feels Like 66°
13
Humidity: 59%
UV Index: 3
Wind: 8 mph
6 PM
Cloudy Weather
64°
Feels Like 64°
13
Humidity: 61%
UV Index: 2
Wind: 8 mph
7 PM
Cloudy Weather
63°
Feels Like 63°
9
Humidity: 63%
UV Index: 1
Wind: 8 mph
8 PM
Cloudy Weather
61°
Feels Like 57°
1
Humidity: 71%
UV Index: 0
Wind: 8 mph
9 PM
Cloudy Weather
59°
Feels Like 55°
1
Humidity: 77%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Weather
57°
Feels Like 54°
1
Humidity: 81%
UV Index: 0
Wind: 7 mph
11 PM
Cloudy Weather
55°
Feels Like 52°
1
Humidity: 86%
UV Index: 0
Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 2.11 µg/m³
  • PM10: 2.27 µg/m³
  • O3: 0.016 ppm
  • NO2: 3.1 ppb
  • SO2: 0.8 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.45 µg/m³
  • PM10: 2.63 µg/m³
  • O3: 0.017 ppm
  • NO2: 3 ppb
  • SO2: 0.8 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.92 µg/m³
  • PM10: 3.12 µg/m³
  • O3: 0.018 ppm
  • NO2: 2.8 ppb
  • SO2: 0.9 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.59 µg/m³
  • PM10: 3.81 µg/m³
  • O3: 0.020 ppm
  • NO2: 2.6 ppb
  • SO2: 0.9 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.09 µg/m³
  • PM10: 4.32 µg/m³
  • O3: 0.021 ppm
  • NO2: 2.6 ppb
  • SO2: 1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.17 µg/m³
  • PM10: 4.38 µg/m³
  • O3: 0.021 ppm
  • NO2: 2.6 ppb
  • SO2: 0.9 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.05 µg/m³
  • PM10: 4.25 µg/m³
  • O3: 0.021 ppm
  • NO2: 2.7 ppb
  • SO2: 0.9 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.87 µg/m³
  • PM10: 4.09 µg/m³
  • O3: 0.021 ppm
  • NO2: 2.9 ppb
  • SO2: 0.9 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.66 µg/m³
  • PM10: 3.91 µg/m³
  • O3: 0.020 ppm
  • NO2: 3.1 ppb
  • SO2: 0.9 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.44 µg/m³
  • PM10: 3.69 µg/m³
  • O3: 0.019 ppm
  • NO2: 3 ppb
  • SO2: 0.9 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: 3.22 µg/m³
  • PM10: 3.47 µg/m³
  • O3: 0.018 ppm
  • NO2: 2.7 ppb
  • SO2: 0.7 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.99 µg/m³
  • PM10: 3.23 µg/m³
  • O3: 0.017 ppm
  • NO2: 2.5 ppb
  • SO2: 0.6 ppb
  • CO: 0.12 ppm

Health Recommendations:

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