Last Revised: July 19, 2026
As of Thursday morning, Philadelphia is in an air quality Code Red with an Air Quality Index (AQI) of 180 - Unhealthy.
EHRS recommends curtailment of strenuous or long-duration outdoor activities during periods when the AQI value is above 201 (code purple). When outdoors, consider masking or voluntary use of an N95 respirator to reduce particulate exposure. It is important that anyone with underlying health conditions, including respiratory or heart conditions, consult with a physician first to ensure that the increased breathing resistance encountered while wearing a respirator does not increase the likelihood of other adverse health effects.
Caution should be used when the AQI value is between 101 and 200 to minimize strenuous outdoor activities. The higher the AQI value, the more reduction in activity should be implemented. Refer to guide below for additional information. Supervisors should consult with EHRS if there are questions or concerns about completion of outdoor job tasks.
University of Pennsylvania AQI-Based Decision-Making Matrix for Wildfire Smoke Events
Consider downloading the EPA Air Now App to monitor current air quality conditions and a forecast discussion.
Indoor Air Quality
The filtration in the air handling systems that service Penn's buildings are effective at capturing contaminants such as smoke particulate. Slight smoke odors may still be detectable but should be considered a nuisance. If indoor odors are particularly strong, or if occupants are suffering from respiratory, skin or eye irritation, contact EHRS and we can work with FRES to evaluate if adjustments can or should be made to the volume of outside air being introduced to the building.
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