Worst air pollution Upper Darby, today and tomorrow
Today (16 July): Air quality in Upper Darby is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 34.1/100).
Tomorrow (17 July 2026): Air quality in Upper Darby is fair. All pollutants stay as today. Pollution peaks around 8:00 AM (O3: 38.0/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Upper Darby's air quality reflects its position in the Philadelphia metropolitan area's Delaware County, with vehicle emissions from I-476 and the dense suburban commercial and residential character contributing elevated NOₓ. The Cobb's Creek corridor provides limited ventilation, while the broader Philadelphia mid-Atlantic regional airshed contributes summer ozone from upwind industrial and urban sources and the flat suburban terrain allows reasonable dispersal throughout the year.
Today - 16 July | Pollution peaks at 08:00
AQI:
Fair
34.1/100
PM2.5 (fine particles):
Good
10.6/100
PM10 (coarse particles):
Good
9.6/100
NO2 (nitrogen dioxide):
Good
6.1/100
O3 (ozone):
Fair
34.1/100
SO2 (sulfur dioxide):
Good
0.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.9/100
PM1 (ultrafine particles):
Good
6.8/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 08:00
AQI:
Fair
38.0/100
PM2.5 (fine particles):
Good
11.4/100
PM10 (coarse particles):
Good
6.6/100
NO2 (nitrogen dioxide):
Good
4.5/100
O3 (ozone):
Fair
38.0/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.6/100
PM1 (ultrafine particles):
Good
7.3/100
Pollen forecast in Upper Darby
View pollen forecastFrequently Asked Questions
Is air quality bad in Upper Darby right now?
On 16 July 2026, overall air quality in Upper Darby is fair. AQI is the main air quality indicator at 34.1/100. Pollution peaks around 8:00 AM (O3: 34.1/100).
Will air quality be worse tomorrow in Upper Darby?
On 17 July 2026, air quality conditions in Upper Darby will be similar to today, with AQI forecast at fair at 38.0/100. Pollution peaks around 8:00 AM (O3: 38.0/100).
When is air pollution at its worst in Upper Darby?
Conditions in Upper Darby vary noticeably across the seasons: once summer ozone season ends, winter typically offers the cleanest air, but the hottest, most humid summer weeks bring the year's highest ozone readings. Suburban and rural areas generally see less of the persistent traffic-driven pollution that affects the urban core.
Are air quality levels in Upper Darby 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