Air Quality Index Scale
0 - 50
Good
51 - 100
Moderate
101 - 150
Unhealthy for Sensitive Groups (USG)
151 - 200
Unhealthy
201 - 300
Very Unhealthy
301 +
Hazardous
No Pollutant Available
No Pollutant Available
https://www.airnow.gov/announcement/5494
Updated AQI for Particle Pollution Now in Effect
2024-05-06
AirNow products now reflect the updated Air Quality Index for fine particle pollution. Learn more about the AQI updates.