Hourly Weather | Today Tuesday, July 21, 2026
Bethlehem, Pennsylvania
4 AM
Cloudy Weather
70°
Feels Like 70°
47
Humidity: 84%
UV Index: 0
Wind: 6 mph
5 AM
Cloudy Weather
70°
Feels Like 70°
47
Humidity: 89%
UV Index: 0
Wind: 6 mph
6 AM
Stormy Weather
68°
Feels Like 66°
51
Humidity: 94%
UV Index: 0
Wind: 6 mph
7 AM
Cloudy Weather
70°
Feels Like 70°
43
Humidity: 96%
UV Index: 0
Wind: 6 mph
8 AM
Stormy Weather
70°
Feels Like 68°
65
Humidity: 95%
UV Index: 0
Wind: 6 mph
9 AM
Cloudy Weather
72°
Feels Like 75°
49
Humidity: 94%
UV Index: 1
Wind: 6 mph
10 AM
Cloudy Weather
73°
Feels Like 79°
49
Humidity: 93%
UV Index: 1
Wind: 7 mph
11 AM
Cloudy Weather
73°
Feels Like 81°
49
Humidity: 92%
UV Index: 2
Wind: 7 mph
12 PM
Stormy Weather
75°
Feels Like 79°
65
Humidity: 89%
UV Index: 2
Wind: 7 mph
1 PM
Cloudy Weather
79°
Feels Like 88°
49
Humidity: 86%
UV Index: 2
Wind: 7 mph
2 PM
Cloudy Weather
79°
Feels Like 88°
49
Humidity: 83%
UV Index: 2
Wind: 7 mph
3 PM
Cloudy Weather
81°
Feels Like 90°
49
Humidity: 81%
UV Index: 2
Wind: 7 mph
4 PM
Stormy Weather
79°
Feels Like 82°
64
Humidity: 83%
UV Index: 1
Wind: 7 mph
5 PM
Cloudy Weather
79°
Feels Like 84°
48
Humidity: 85%
UV Index: 1
Wind: 7 mph
6 PM
Stormy Weather
79°
Feels Like 81°
56
Humidity: 86%
UV Index: 0
Wind: 7 mph
7 PM
Cloudy Weather
75°
Feels Like 82°
49
Humidity: 89%
UV Index: 0
Wind: 7 mph
8 PM
Cloudy Weather
73°
Feels Like 79°
49
Humidity: 94%
UV Index: 0
Wind: 6 mph
9 PM
Stormy Weather
73°
Feels Like 73°
63
Humidity: 94%
UV Index: 0
Wind: 6 mph
10 PM
Stormy Weather
72°
Feels Like 73°
55
Humidity: 98%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Weather
72°
Feels Like 73°
40
Humidity: 100%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

4 AM
53 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.33 µg/m³
  • PM10: 17.52 µg/m³
  • O3: 0.054 ppm
  • NO2: 1.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.39 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 12.28 µg/m³
  • PM10: 16.06 µg/m³
  • O3: 0.052 ppm
  • NO2: 1.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.38 ppm

Health Recommendations:

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

6 AM
46 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.07 µg/m³
  • PM10: 13.98 µg/m³
  • O3: 0.049 ppm
  • NO2: 1.3 ppb
  • SO2: 0.5 ppb
  • CO: 0.36 ppm

Health Recommendations:

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

7 AM
42 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.71 µg/m³
  • PM10: 11.62 µg/m³
  • O3: 0.045 ppm
  • NO2: 1.7 ppb
  • SO2: 0.5 ppb
  • CO: 0.34 ppm

Health Recommendations:

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

8 AM
38 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.56 µg/m³
  • PM10: 9.86 µg/m³
  • O3: 0.041 ppm
  • NO2: 2.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.31 ppm

Health Recommendations:

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

9 AM
34 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 7.59 µg/m³
  • PM10: 8.47 µg/m³
  • O3: 0.036 ppm
  • NO2: 3.1 ppb
  • SO2: 0.5 ppb
  • CO: 0.29 ppm

Health Recommendations:

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

10 AM
28 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 6.62 µg/m³
  • PM10: 7.23 µg/m³
  • O3: 0.031 ppm
  • NO2: 3.3 ppb
  • SO2: 0.6 ppb
  • CO: 0.26 ppm

Health Recommendations:

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

11 AM
24 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 5.72 µg/m³
  • PM10: 6.2 µg/m³
  • O3: 0.026 ppm
  • NO2: 3.3 ppb
  • SO2: 0.6 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

12 PM
21 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 5 µg/m³
  • PM10: 5.41 µg/m³
  • O3: 0.023 ppm
  • NO2: 3.1 ppb
  • SO2: 0.6 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.67 µg/m³
  • PM10: 5.03 µg/m³
  • O3: 0.023 ppm
  • NO2: 2.8 ppb
  • SO2: 0.7 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.76 µg/m³
  • PM10: 5.07 µg/m³
  • O3: 0.026 ppm
  • NO2: 2.5 ppb
  • SO2: 0.7 ppb
  • CO: 0.15 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: 5.29 µg/m³
  • PM10: 5.58 µg/m³
  • O3: 0.032 ppm
  • NO2: 2.3 ppb
  • SO2: 0.7 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.75 µg/m³
  • PM10: 6.04 µg/m³
  • O3: 0.035 ppm
  • NO2: 2.3 ppb
  • SO2: 0.7 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.77 µg/m³
  • PM10: 6.06 µg/m³
  • O3: 0.036 ppm
  • NO2: 2.5 ppb
  • SO2: 0.7 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.47 µg/m³
  • PM10: 5.77 µg/m³
  • O3: 0.034 ppm
  • NO2: 2.9 ppb
  • SO2: 0.8 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.05 µg/m³
  • PM10: 5.35 µg/m³
  • O3: 0.032 ppm
  • NO2: 3.6 ppb
  • SO2: 0.8 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.7 µg/m³
  • PM10: 5 µg/m³
  • O3: 0.028 ppm
  • NO2: 4.2 ppb
  • SO2: 0.8 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: 4.44 µg/m³
  • PM10: 4.72 µg/m³
  • O3: 0.025 ppm
  • NO2: 4.4 ppb
  • SO2: 0.7 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.34 µg/m³
  • PM10: 4.59 µg/m³
  • O3: 0.023 ppm
  • NO2: 4.2 ppb
  • SO2: 0.6 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.05 µg/m³
  • PM10: 4.25 µg/m³
  • O3: 0.023 ppm
  • NO2: 3.9 ppb
  • SO2: 0.5 ppb
  • CO: 0.13 ppm

Health Recommendations:

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