Air Quality in Bethlehem, United States

Drizzle
11.6°C · 78.1% humidity
11.6°
Feels 11.6°
145
Unhealthy for sensitive groups
Sensitive groups should reduce prolonged outdoor exertion.
1 station

Nearby Monitoring Stations

AQI Forecast Calibrated
137 7pm
137
137
145 10pm
143
141
140 1am
139
139
138 4am
138
145
144 7am
144
137
137 10am
137
137
137 1pm
137
144
144 4pm
144
144
Station readings
155
119
CAMS model adj +110
27
27
27
27
27
27
27
27
27
27
27
34
34
34
27
27
27
27
27
27
34
34
34
34
AD 728×90

Air Quality Index Trend

28h · 1 stn

Bethlehem's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in Bethlehem is 3.5× the WHO 24-hour guideline of 15 µg/m³.

78.1%
Humidity
50.1 km/h
Wind WSW
1001.4 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
145
53.16 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Bethlehem?

Temperature & Precipitation

PM2.5 Trend

28h · 1 station
PM2.553.16 µg/m³ ×3.5 WHO
Unhealthy for sensitive groups
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
Station readings (1 station within 25 km)
53.16
Median
53.16
Average
53.16
Low
53.16
High
PM2.5 µg/m³ · Model: 6.5 · Bias: -46.7

What is the 7-day forecast for Bethlehem?

06-09
30.2° 10.7°
0.13 mm
06-10
21.8° 17.7°
13.94 mm
06-11
23.7° 12.0°
06-12
20.4° 14.8°
37.38 mm
06-13
28.4° 15.8°
0.25 mm
06-14
22.3° 16.4°
5.94 mm
06-15
23.0° 12.1°
Both models agree Avg diff: 6.9°C

Where are air quality stations near Bethlehem?

17
Freemansburg, Pennsylvania, USA
2.5 km PM2.5: 4.1 µg/m³
119
Easton, Pennsylvania
16.2 km PM2.5: 42.8 µg/m³ PM10: 50.1 µg/m³

What cities are near Bethlehem?

27 Allentown 145 Whitehall Township 26 Lansdale 26 Limerick 32 Pottstown 27 Norristown 26 Phoenixville 17 Willow Grove 27 King of Prussia 17 Abington
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-06-09T02:11 UTC.