Historical Air Quality > AQI By Region

Number of Days in Each AQI Category

    All Regions   Metro Baltimore Eastern Shore Metro Washington West Maryland
VeryUnhealthy 0 0 0 0 0
Unhealthy 0 0 0 0 0
UnhealthySG 4 3 2 2 1
Moderate 68 53 21 36 57
Good 64 80 67 98 77

Preliminary data, subject to revision or deletion.



EPA Releases New Ozone Standard

Note: Data are preliminary and subject to validation
AQI Conversion Charts: Ozone  Particulate Matter (PM)