Region 1: EPA New England

Air Quality Index

0-50 Good
51-100 Moderate
101-150 USG*
151-200 Unhealthy
201-300 Very Unhealthy
301+ Hazardous
*Unhealthy for Sensitive Groups

OZONE AND PARTICLE POLLUTION

The Current AQI and Yesterday's AQI maps are created from ozone and particle data gathered from a nationwide network of state and local air monitoring stations. The maps show the higher of the estimated ozone AQI and PM2.5 AQI. The Forecasted AQI maps are created from data submitted the State Air Quality Forecasters.