AQI Levels of Health Concern

Numerical

Value

Meaning

Good

0 - 50

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

Moderate

51 - 100

Air 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.

Unhealthy,

sensitive groups

101 - 150

Members of sensitive groups may experience health effects. The general public is not likely to be affected.

Unhealthy

151 - 200

Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.

Very

Unhealthy

201 - 300

Health warnings of emergency conditions. The entire population is more likely to be affected.

Hazardous

301 - 500

Everyone may experience more serious health effects.