Hourly Weather | Today Wednesday, March 18, 2026
Bethlehem, Pennsylvania
10 AM
Cloudy Weather
27°
Feels Like 25°
0
Humidity: 46%
UV Index: 2
Wind: 7 mph
11 AM
Cloudy Weather
28°
Feels Like 27°
0
Humidity: 39%
UV Index: 2
Wind: 8 mph
12 PM
Cloudy Weather
32°
Feels Like 32°
0
Humidity: 36%
UV Index: 3
Wind: 7 mph
1 PM
Cloudy Weather
34°
Feels Like 37°
0
Humidity: 33%
UV Index: 4
Wind: 7 mph
2 PM
Cloudy Weather
36°
Feels Like 41°
0
Humidity: 31%
UV Index: 5
Wind: 6 mph
3 PM
Cloudy Weather
37°
Feels Like 39°
0
Humidity: 30%
UV Index: 4
Wind: 7 mph
4 PM
Cloudy Weather
37°
Feels Like 37°
0
Humidity: 30%
UV Index: 3
Wind: 7 mph
5 PM
Cloudy Weather
37°
Feels Like 36°
0
Humidity: 30%
UV Index: 2
Wind: 8 mph
6 PM
Cloudy Weather
36°
Feels Like 34°
0
Humidity: 34%
UV Index: 1
Wind: 7 mph
7 PM
Cloudy Weather
36°
Feels Like 30°
0
Humidity: 38%
UV Index: 0
Wind: 6 mph
8 PM
Cloudy Night
34°
Feels Like 30°
0
Humidity: 42%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
30°
Feels Like 28°
0
Humidity: 49%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
30°
Feels Like 27°
0
Humidity: 55%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
28°
Feels Like 27°
0
Humidity: 57%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 1.32 µg/m³
  • PM10: 2.61 µg/m³
  • O3: 0.050 ppm
  • NO2: 2.7 ppb
  • SO2: 1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.21 µg/m³
  • PM10: 2.46 µg/m³
  • O3: 0.050 ppm
  • NO2: 2.4 ppb
  • SO2: 0.9 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.29 µg/m³
  • PM10: 2.54 µg/m³
  • O3: 0.051 ppm
  • NO2: 2.2 ppb
  • SO2: 0.8 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.57 µg/m³
  • PM10: 2.83 µg/m³
  • O3: 0.052 ppm
  • NO2: 2.1 ppb
  • SO2: 0.8 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: 1.99 µg/m³
  • PM10: 3.28 µg/m³
  • O3: 0.052 ppm
  • NO2: 2.1 ppb
  • SO2: 0.8 ppb
  • CO: 0.15 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: 2.38 µg/m³
  • PM10: 3.66 µg/m³
  • O3: 0.054 ppm
  • NO2: 2.1 ppb
  • SO2: 0.8 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.6 µg/m³
  • PM10: 3.78 µg/m³
  • O3: 0.056 ppm
  • NO2: 2 ppb
  • SO2: 0.8 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.02 µg/m³
  • PM10: 4.21 µg/m³
  • O3: 0.056 ppm
  • NO2: 2.1 ppb
  • SO2: 0.9 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.74 µg/m³
  • PM10: 5.42 µg/m³
  • O3: 0.054 ppm
  • NO2: 3.3 ppb
  • SO2: 1 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.49 µg/m³
  • PM10: 7.03 µg/m³
  • O3: 0.049 ppm
  • NO2: 5.9 ppb
  • SO2: 1 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.14 µg/m³
  • PM10: 8.52 µg/m³
  • O3: 0.045 ppm
  • NO2: 7.4 ppb
  • SO2: 1.1 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: 5.67 µg/m³
  • PM10: 9.68 µg/m³
  • O3: 0.043 ppm
  • NO2: 7.6 ppb
  • SO2: 1.2 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: 6.07 µg/m³
  • PM10: 10.42 µg/m³
  • O3: 0.042 ppm
  • NO2: 7.2 ppb
  • SO2: 1.2 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: 6.49 µg/m³
  • PM10: 11.15 µg/m³
  • O3: 0.041 ppm
  • NO2: 6.9 ppb
  • SO2: 1.2 ppb
  • CO: 0.19 ppm

Health Recommendations:

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