Note: The Actual AQI is calculated from actual measurement. For Particulate Matter the AQI is based on the calculated 24-hour average concentration, measured from midnight to midnight. For Ozone, the AQI is based on the maximum daily 8-hour average concentration measured during a given day.

* Days missing an ‘Actual Calculated AQI’ are reported with ‘* No Data’
Know Before You Go! Air Quality Index
Category Index Value Level of Health Concerns
Green 0 - 50 Good
Yellow 51 - 100 Moderate
Orange 101 - 150 Unhealthy for sensitive groups
Red 151 - 200 Unhealthy
Purple 201 - 300 Very Unhealthy
Maroon 301 - 500 Hazardous