Philadelphia
 
Data and Forecasts courtesy of:
 

 
AQI: Good (0 - 50) AQI: Good (0 - 50)
Air quality is considered satisfactory, and air pollution poses little or no risk.
AQI: Moderate (51 - 100) AQI: Moderate (51 - 100)
Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
AQI: Unhealthy for Sensitive Groups (101 - 150) AQI: Unhealthy for Sensitive Groups (101 - 150)
Although general public is not likely to be affected at this AQI range, people with lung disease, older adults and children are at a greater risk from exposure to ozone, whereas persons with heart and lung disease, older adults and children are at greater risk from the presence of particles in the air.
AQI: Unhealthy (151 - 200) AQI: Unhealthy (151 - 200)
Everyone may begin to experience health effects members of sensitive groups may experience more serious health effects.
 AQI:Very Unhealthy (201 - 300) AQI: Very Unhealthy (201 - 300)
Health alert: everyone may experience more serious health effects.
AQI: Hazardous(301 - 500) AQI: Hazardous (301 - 500)
Health warnings of emergency conditions. The entire population is more likely to be affected.
Action DayAction Day
 
Local Air Quality Resources
Current Air Quality Index | Forecast | Ozone Action Program
 
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
 
Data and Forecasts courtesy of:
Current Conditions
Data Not Available
Air Quality Forecast
Today Tomorrow
Air Quality Index (AQI)
71
Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Data Not Available
AQI - Pollutant Details
Ozone
71
Moderate
Particles (PM2.5)
50
Good
Data Not Available
Forecast Discussion: The arrival of high pressure on Thursday marks the first of two days when ozone will be on the rise in the Delaware Valley. Sunny skies and a much drier air mass will allow temperatures to rise into the mid-80s °F. Northerly flow aloft may transport smoke from wildfires burning in southern Manitoba and Saskatchewan. Smoke is an issue because it contains pollutant precursors for ozone formation. Ample vertical mixing will provide some atmospheric ventilation on Thursday, but given the possibility of polluted air transport aloft in conjunction with weak surface winds and full sun, ozone has the potential to surge into the mid-Moderate range. Particles will remain in the upper Good to threshold Moderate range in response to the northerly, smoky air transport. **Extended Forecast: Abundant daytime heating under strong late May sun on Friday will allow temperatures to reach into the upper 80s °F, with some locations approaching 90 °F. A continuation of ozone-conducive weather conditions, in addition to potentially another day of smoke transport aloft, will push ozone to the upper Moderate range, while particles will linger near the Good/Moderate threshold. Saturday will be very warm and uncomfortably humid. The chances are increasing for afternoon showers and thunderstorms, which will drop ozone down to the Good/Moderate threshold. A shift in the transport pattern aloft will return particle concentrations to the Good range. -Enlow/Huff
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