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:
Air Quality Forecast
Today Tomorrow
Air Quality Index (AQI)
45 
Good
Health Message: None
Air Quality Index (AQI)
60 
Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
AQI - Pollutant Details
Ozone
45 
Good
Particles (PM2.5)
38 
Good
Ozone
60 
Moderate
Particles (PM2.5)
48 
Good
Forecast Discussion: It will be a lovely late summer weekend across the Delaware Valley. A cold front that moved through the forecast area on Friday evening will usher in seasonably warm but less humid air. On Saturday, the sun will return and atmospheric humidity will gradually become more comfortable as high pressure builds in from the west. The arrival of clean air from upwind will keep ozone and particles in the Good range despite plenty of sun and light surface winds. Sunday will be a delightful day, with comfortable humidity and sunny skies. Diminishing surface winds will allow ozone to rise into the Moderate range, while particles linger in the Good range in the still relatively clean air mass. The center of high pressure will move nearly overhead on Monday morning before sinking south and east in the afternoon. A period of calm winds and plenty of afternoon sunshine will push ozone to the top of the Moderate range. Particles will rise into the low Moderate range as humidity begins ramping back up. **Extended Forecast: A shift to southerly flow aloft on Tuesday will bring cleaner maritime air into the forecast area. Although it will be hot and mostly sunny, this cleaner air will bring ozone a bit lower in the Moderate range. Particles will remain in the low Moderate range due to rising humidity. -Huff

Current Conditions
Air Quality Index (AQI)
observed at 21:00 EDT
53
Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion.
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 50 Good
Particles (PM2.5) 53 Moderate

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