About the Air Quality Index

Air Quality Index Logo

The Air Quality Index (AQI) is a color-coded tool for reporting daily air quality. It provides simple information on local air quality, the health concerns for different levels of air pollution, and how you can protect your health when pollutants reach unhealthy levels.

Air Quality Index Table

Levels of Health Concern

Meaning 

Colors

GoodAir quality is considered satisfactory. Air pollution poses little or no riskGreen
ModerateAir 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.Yellow
Unhealthy for Sensitive GroupsPeople with heart and lung disease, older adults, and children are at greater risk from air pollution.Orange
UnhealthyEveryone may begin to experience health effects; members of sensitive groups may experience more serious health effectsRed
Very UnhealthyHealth Alert: everyone may experience more serious health effects.Purple
HazardousHealth warnings of emergency conditions. The entire population is more likely to be affected.Maroon