Worst air pollution Bethlehem, today and tomorrow
Today (16 July): Air quality in Bethlehem is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 PM (O3: 37.6/100).
Tomorrow (17 July 2026): Air quality in Bethlehem is fair. AQI improves to medium; NO2 increases to fair; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 12:00 PM (O3: 40.4/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Bethlehem's air quality in Pennsylvania reflects the Lehigh Valley's position in the mid-Atlantic corridor, with vehicle emissions from US-22 and the former Bethlehem Steel complex legacy contributing local sources. The surrounding Pennsylvania ridgelines provide partial topographic barriers, while the Lehigh river valley provides some natural ventilation and the broader mid-Atlantic regional airshed contributes upwind industrial and urban sources from the Philadelphia and New York corridors throughout the year.
Today - 16 July | Pollution peaks at 12:00
AQI:
Fair
37.6/100
PM2.5 (fine particles):
Good
13.5/100
PM10 (coarse particles):
Good
13.7/100
NO2 (nitrogen dioxide):
Good
12.8/100
O3 (ozone):
Fair
37.6/100
SO2 (sulfur dioxide):
Good
2.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.1/100
PM1 (ultrafine particles):
Good
7.4/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 12:00
AQI:
Medium
40.4/100
PM2.5 (fine particles):
Good
9.2/100
PM10 (coarse particles):
Good
4.5/100
NO2 (nitrogen dioxide):
Fair
21.6/100
O3 (ozone):
Medium
40.4/100
SO2 (sulfur dioxide):
Good
2.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.9/100
PM1 (ultrafine particles):
Good
5.8/100
Pollen forecast in Bethlehem
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Bethlehem
Frequently Asked Questions
Is air quality bad in Bethlehem right now?
On 16 July 2026, overall air quality in Bethlehem is fair. AQI is the main air quality indicator at 37.6/100. Pollution peaks around 12:00 PM (O3: 37.6/100).
Will air quality be worse tomorrow in Bethlehem?
On 17 July 2026, air quality conditions in Bethlehem will be similar to today, with NO2 forecast at fair at 21.6/100. Pollution peaks around 12:00 PM (O3: 40.4/100).
When is air pollution at its worst in Bethlehem?
Bethlehem's air quality follows a clear seasonal pattern: the calmest air of the year usually arrives well after the summer ozone season fades, but extended summer heat waves, often worsened by regional haze, bring the toughest air quality stretch. Dense urban traffic corridors add a persistent background level of pollution that varies less by season than ozone does.
Are air quality levels in Bethlehem based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app