AQI Categories

Health Concern

Ozone (ppm)

PM2.5 (µg/m³)

NO₂ (ppb)

Good (up to 50)

Air quality is satisfactory

0 - 0.054

0 - 12.0

0 - 53

Moderate (51-100)

Air quality is acceptable; however, unusually sensitive people should consider reducing prolonged or heavy exertion.

0.055 - 0.070

12.1 - 35.4

54 - 100

Unhealthy for Sensitive Groups (101 - 150)

People with heart and lung disease, older adults and children are at a greater risk from exposure to ozone and particulate matter.

0.071 - 0.085

35.5 - 55.4

101 - 360

Unhealthy (151 - 200)

Everyone may begin to experience some adverse health effects, and those in the sensitive groups may experience more serious health effects.

0.086 - 0.105

55.5 - 150.4

361 - 649

Very Unhealthy (201 - 300)

Everyone may experience more serious health effects

0.106 - 0.200

150.5 - 250.4

650 - 1249

Hazardous (301 - 500)

Entire population is more likely to be affected.

-

250.5 - 500.4

1250 - 2049