Hourly Weather | Today Tuesday, September 1, 2026
Bethlehem, Pennsylvania
12 PM
Cloudy Weather
81°
Feels Like 90°
40
Humidity: 76%
UV Index: 3
Wind: 7 mph
1 PM
Cloudy Weather
82°
Feels Like 91°
36
Humidity: 70%
UV Index: 3
Wind: 7 mph
2 PM
Cloudy Weather
84°
Feels Like 93°
34
Humidity: 67%
UV Index: 3
Wind: 8 mph
3 PM
Cloudy Weather
86°
Feels Like 93°
34
Humidity: 65%
UV Index: 3
Wind: 8 mph
4 PM
Cloudy Weather
84°
Feels Like 91°
39
Humidity: 69%
UV Index: 2
Wind: 8 mph
5 PM
Cloudy Weather
82°
Feels Like 90°
49
Humidity: 74%
UV Index: 1
Wind: 7 mph
6 PM
Cloudy Weather
81°
Feels Like 88°
49
Humidity: 79%
UV Index: 1
Wind: 7 mph
7 PM
Stormy Weather
81°
Feels Like 82°
61
Humidity: 82%
UV Index: 0
Wind: 7 mph
8 PM
Cloudy Night
79°
Feels Like 84°
40
Humidity: 87%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
75°
Feels Like 82°
34
Humidity: 93%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
73°
Feels Like 79°
37
Humidity: 97%
UV Index: 0
Wind: 7 mph
11 PM
Cloudy Night
73°
Feels Like 75°
43
Humidity: 96%
UV Index: 0
Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 10.69 µg/m³
  • PM10: 12.45 µg/m³
  • O3: 0.039 ppm
  • NO2: 4.1 ppb
  • SO2: 0.9 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.62 µg/m³
  • PM10: 11.02 µg/m³
  • O3: 0.045 ppm
  • NO2: 3.2 ppb
  • SO2: 0.8 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.22 µg/m³
  • PM10: 9.37 µg/m³
  • O3: 0.048 ppm
  • NO2: 2.7 ppb
  • SO2: 0.8 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.85 µg/m³
  • PM10: 6.51 µg/m³
  • O3: 0.052 ppm
  • NO2: 1.9 ppb
  • SO2: 0.6 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.58 µg/m³
  • PM10: 4.98 µg/m³
  • O3: 0.054 ppm
  • NO2: 1.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

5 PM
52 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.57 µg/m³
  • PM10: 4.93 µg/m³
  • O3: 0.055 ppm
  • NO2: 1.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.11 µg/m³
  • PM10: 5.79 µg/m³
  • O3: 0.048 ppm
  • NO2: 2.9 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.65 µg/m³
  • PM10: 6.78 µg/m³
  • O3: 0.037 ppm
  • NO2: 4.6 ppb
  • SO2: 0.5 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.97 µg/m³
  • PM10: 7.45 µg/m³
  • O3: 0.030 ppm
  • NO2: 5.3 ppb
  • SO2: 0.5 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

9 PM
26 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 6.14 µg/m³
  • PM10: 7.79 µg/m³
  • O3: 0.026 ppm
  • NO2: 5.1 ppb
  • SO2: 0.5 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

10 PM
27 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 6.44 µg/m³
  • PM10: 8.26 µg/m³
  • O3: 0.023 ppm
  • NO2: 4.9 ppb
  • SO2: 0.5 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

11 PM
29 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 6.85 µg/m³
  • PM10: 8.76 µg/m³
  • O3: 0.021 ppm
  • NO2: 5 ppb
  • SO2: 0.5 ppb
  • CO: 0.16 ppm

Health Recommendations:

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