Worst air pollution Lower Merion, today and tomorrow
Today (16 July): Air quality in Lower Merion 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 Lower Merion 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.
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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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Lower Merion's air quality benefits from the affluent suburban Pennsylvania Mainline position west of Philadelphia, with vehicle emissions from I-76 and US-30 the primary local sources in this major Philadelphia western suburb. The Schuylkill River corridor provides limited ventilation, while the broader Philadelphia mid-Atlantic regional airshed contributes summer ozone from the Delaware Valley industrial and urban sources and the surrounding suburban parkland character maintains relatively lower local emission density than comparable urban areas.
Today - 16 July | Pollution peaks at 08:00
AQI:
Fair
34.1/100
PM2.5 (fine particles):
Good
9.8/100
PM10 (coarse particles):
Good
8.9/100
NO2 (nitrogen dioxide):
Good
0.0/100
O3 (ozone):
Fair
34.1/100
SO2 (sulfur dioxide):
Good
0.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.9/100
PM1 (ultrafine particles):
Good
6.3/100
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
10.6/100
PM10 (coarse particles):
Good
6.1/100
NO2 (nitrogen dioxide):
Good
0.0/100
O3 (ozone):
Fair
38.0/100
SO2 (sulfur dioxide):
Good
0.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.6/100
PM1 (ultrafine particles):
Good
6.8/100
Pollen forecast in Lower Merion
View pollen forecastFrequently Asked Questions
Is air quality bad in Lower Merion right now?
On 16 July 2026, overall air quality in Lower Merion 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 Lower Merion?
On 17 July 2026, air quality conditions in Lower Merion 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 Lower Merion?
Like most US cities, Lower Merion sees air quality shift from season to season — once summer ozone season ends, winter typically offers the cleanest air, whereas summer heat waves bring the highest ozone risk, compounded by pollution drifting in from the wider region. Dense urban traffic corridors add a persistent background level of pollution that varies less by season than ozone does.
Are air quality levels in Lower Merion 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