Daily AQI Color

Levels of Concern

Values of Index

Description of Air Quality

Green

Good

0 to 50

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

Yellow

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.

Orange

Unhealthy for Sensitive Groups

101 to 150

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

Red

Unhealthy

151 to 200

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

Purple

Very Unhealthy

201 to 300

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

Maroon

Hazardous

301 and higher

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