Air quality in the Washington D.C. area

Washington D.C.
Poss. Unhealthy
Good
Moderate
Poss. Unhealthy
Unhealthy
Very Unhealthy
Hazardous
Air Quality Index
Unhealthy
Poss. Unhealthy
Poss. Unhealthy
Poss. Unhealthy
Poss. Unhealthy