Skip to main content

Mental & physical health

Air quality

The Department of Public Health provides real-time daily updates and other resources about the air quality in Philadelphia.



Current conditions in Philadelphia

AQI basics for ozone and particle pollution


Good — 0 to 50

Air quality is satisfactory, and air pollution poses little or no risk.


Moderate — 51 to 100

Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.


Unhealthy for Sensitive Groups — 101 to 150

Members of sensitive groups may experience health effects. The general public is less likely to be affected.


Unhealthy — 151 to 200

Some members of the general public may experience health effects. Members of sensitive groups may experience more serious health effects.


Very Unhealthy — 201 to 300

Health alert: The risk of health effects is increased for everyone.


Hazardous — 301 and higher

Health warning of emergency conditions: everyone is more likely to be affected.

Interactive map of air monitoring stations

This map shows the locations of the City’s air monitoring stations. Click on a station to display the latest available hourly concentration of the pollutants measured there.

Other air quality resources

  • The EPA’s AirNow website provides an interactive map that includes a NowCast AQI value for PM2.5, PM10, and ozone at each monitoring site where those pollutants are measured. The NowCast is EPA’s method for relating hourly data to the AQI.
  • For more information on individual pollutants, visit Criteria Air Pollutants.
  • To view a table of the National Ambient Air Quality Standards (NAAQS), visit NAAQS-table.
  • For a comprehensive description of Philadelphia’s most recent air monitoring network plan, visit Air Management Services reports and documents.

Historical air pollution data

Historical air pollution data for Philadelphia and the rest of the country is available at Air Data: Air Quality Data Collected at Outdoor Monitors Across the US.