Critical PollutantLevel of Health ConcernHealth Message
Particulate MatterModerateUnusually sensitive people should consider reducing prolonged or heavy exertion.
Warning - Hot Weather Caution:
During summer months a forecast of extreme heat could indicate that precautions
should be taken to protect the safety of older citizens and others at risk due
to the high temperature. Be aware that during forecasts of extreme heat
the air quality may be good or unhealthy. Taking actions to protect
yourself from high temperature is the priority and will also help protect you
from elevated pollutant levels.
Welcome to Philadelphia's Real-Time Air Quality Information Web Site!
This web site provides current information about the air
quality in Philadelphia and lets you know what you should do to protect your
health if the air quality is unhealthy. A key tool to do this is the
Air Quality Index (AQI). The AQI is a color coding
system as seen in the chart below. Using formulas created by the EPA,
data for pollutants are converted into a score ranging from 0 to 500. Values
exceeding 100 trigger "Action Days" where you are advised to take precautions
to protect yourself from health effects. The highest of the pollutant scores is
reported as the overall air quality rating for Philadelphia for a given
Additional information may be obtained through the
Air Management Services (AMS)
Web Site. AMS is the local air pollution control
agency for the City of Philadelphia and provides services to achieve healthy
air quality through the prevention and control of air pollution and air
pollution nuisances. To make a specific request, please send an email.