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The area with the highest AQ Index (as of 8:00 EST) in is in the Philadelphia area. Particle Pollution (PM2.5) is measuring at 102 (Unhealthy for Sensitive Groups). This means members of sensitive groups may experience health effects. The general public is less likely to be affected.
Over the next few days, the highest primary air pollutant will be Particle Pollution (PM2.5) in the Philadelphia area. It is forecasted to be 51 (Moderate), meaning air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Below is a clickable map of Chester County, Pennsylvania. The markers on the map identify large, populated cities. If you hover over a marker, it will display the city name and the current AQ index. The color of the city markers also references the current AQ risk level.
| Range | 0 - 50 | 51 - 100 | 101 - 150 | 151 - 200 | 201 - 300 | 301 - 500 |
| Color | ||||||
| Category | Good | Moderate | Unhealthy for Sensitive Groups | Unhealthy | Very Unhealthy | Hazardous |
Last Updated 20 minutes ago
Below is a list of cities in Chester County where we track and forecast the AQ index. Click on a city name to get the current AQ index as well as any available forcasts.