Mercer County
Data courtesy of:

AQI: Good (0 - 50) AQI: Moderate (51 - 100) AQI: Unhealthy for Sensitive Groups (101 - 150) AQI: Unhealthy (151 - 200) AQI: Very Unhealthy (201 - 300) AQI: Hazardous(301 - 500) Action Day
Local Air Quality Resources
State Air Quality Resources
Air Quality Partnership of Lehigh Valley - Berks
Air Quality Partnership of the Delaware Valley
Air Quality Partnership of the Susquehanna Valley
American Lung Association (ALA) of Pennsylvania
PA Allergy & Asthma Association
Pennsylvania DEP - BAQ - Contacts
Pennsylvania DEP - BAQ - Current Air Quality Index (AQI) by Area
Pennsylvania DEP - Bureau of Air Quality (BAQ)
Pennsylvania DEP – Air Quality Forecast Home Page
Pennsylvania DEP – Home Page
Southwest PA Air Quality Partnership
Air Quality Forecast
Today's High Tomorrow's High
Air Quality Index (AQI)
Moderate Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion.
Air Quality Index (AQI)
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
AQI - Pollutant Details
Forecast Discussion: At 2 p.m. EDT this Friday afternoon, high pressure is building across the area with drier air moving in. Ozone concentrations remain in the good range. High pressure bringing a mostly sunny sky and warm air for Saturday will cause ozone levels to ramp up to moderate territory. A weak upper level disturbance then can spark a thunderstorm for later Sunday into Monday, which will cause ozone to vary between the upper good and lower moderate ranges. During the latter part of next week, we will feel a cooldown, just in time for the start of September, with better air quality.---McAuliffe

Current Conditions
Air Quality Index (AQI)
observed at 13:00 EDT
Health Message: None
Note: Values above 500 are considered Beyond the AQI. Follow recommendations for the Hazardous category. Additional information on reducing exposure to extremely high levels of particle pollution is available here.
AQI - Pollutant Details
Ozone 36 Good
Particles (PM2.5) 12 Good

Past Air Quality Maps and Data
Yesterday's Maps and Data
Air Quality Maps Archives (by region)