Germantown, Philadelphia Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in Germantown is fair. AQI, NO2, O3, and PM1 are fair; PM2.5, PM10, SO2, CO, and HCHO are good. Pollution peaks around 5:00 PM (NO2: 39.4/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in Germantown is fair. PM2.5 increases to fair; O3 decreases to good; all other pollutants stay as today. Pollution peaks around 5:00 PM (NO2: 39.2/100).
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Air Quality
Today - 10 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 39.4/100 |
| PM2.5 (fine particles) | Good | 19.6/100 |
| PM10 (coarse particles) | Good | 12.0/100 |
| NO2 (nitrogen dioxide) | Fair | 39.4/100 |
| O3 (ozone) | Fair | 22.5/100 |
| SO2 (sulfur dioxide) | Good | 2.1/100 |
| CO (carbon monoxide) | Good | 0.5/100 |
| HCHO (formaldehyde) | Good | 2.5/100 |
| PM1 (ultrafine particles) | Fair | 30.6/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 39.2/100 |
| PM2.5 (fine particles) | Fair | 21.7/100 |
| PM10 (coarse particles) | Good | 12.8/100 |
| NO2 (nitrogen dioxide) | Fair | 39.2/100 |
| O3 (ozone) | Good | 19.8/100 |
| SO2 (sulfur dioxide) | Good | 2.5/100 |
| CO (carbon monoxide) | Good | 0.5/100 |
| HCHO (formaldehyde) | Good | 3.0/100 |
| PM1 (ultrafine particles) | Fair | 37.7/100 |
Local Environmental Conditions
This part of Philadelphia is largely built up, so vehicle exhaust and urban activity dominate the local air pollution sources. Home heating, especially wood stoves and fireplaces, adds smoke and fine particles in the colder months. Woodland in the area offers some natural filtering of particles from traffic. Pollution carried in from the wider region can also raise levels at times.
Fine particle levels climb from November to March, as home heating and traffic combine with cold, still air averaging 0°C. By contrast, summer sun from June to September cooks traffic fumes into ozone, especially in the warmest month, which averages 26°C. Overall, stronger winds around March, about 15 km/h on average, usually bring some of the cleanest air of the year.
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Frequently Asked Questions About Air Quality in Pennsylvania
Is air quality bad in Germantown right now?
On 10 October 2026, overall air quality in Germantown is fair. AQI is the main air quality indicator at 39.4/100. Pollution peaks around 5:00 PM (NO2: 39.4/100).
Will air quality be worse tomorrow in Germantown?
On 11 October 2026, air quality conditions in Germantown will be similar to today, with AQI forecast at fair at 39.2/100. Pollution peaks around 5:00 PM (NO2: 39.2/100).
When is air pollution at its worst in Germantown?
Fine particle levels climb from November to March, as home heating and traffic combine with cold, still air averaging 0°C. By contrast, summer sun from June to September cooks traffic fumes into ozone, especially in the warmest month, which averages 26°C. Overall, stronger winds around March, about 15 km/h on average, usually bring some of the cleanest air of the year.
Are air quality levels in Germantown 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
Understanding the Scale
The 0–100 air quality scores represent risk levels, not direct air pollutant concentrations. Higher scores indicate higher risk.
Air Quality
| Good | 0-20 | Low air quality risk. Air quality is expected to be good, with low levels of pollution. |
| Fair | 20-40 | Generally low air quality risk. Air quality is expected to be acceptable, with some pollution present. |
| Moderate | 40-60 | Moderate air quality risk. Air pollution is elevated and air quality may be less favorable. |
| Poor | 60-80 | High air quality risk. Air pollution is high and air quality is expected to be poor. |
| Very Poor | 80-100 | Very high air quality risk. Air pollution is very high and air quality is expected to be very poor. |