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.