Worst air pollution Independence Hall - Philadelphia, today and tomorrow

On 18 July 2026, overall air quality in Independence Hall is fair. AQI is the main air quality indicator at 34.6/100. Pollution peaks around 9:00 AM (O3: 34.6/100).

On 19 July 2026, air quality conditions in Independence Hall will be similar to today, with AQI forecast at fair at 34.3/100. Pollution peaks around 8:00 AM (O3: 34.3/100).

Like the rest of Philadelphia, Independence Hall sees air quality change through the year. Typically, the cleanest stretch of the year usually comes in winter, while 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.

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.

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.