Erie and Chautauqua Counties both get an "F" rating for their respective ozone ratings.
The American Lung Association has released its "State of the Air" Report, which analyzes data from official air quality monitors to assess the air we breathe.
Erie County reported eleven high ozone days over three years. Chautauqua County is right behind its northern counterpart, reporting ten of those dangerous air days.
Air quality is better in Niagara County, where four high ozone days earned it a "C" grade.
There are no monitoring devices in Allegany, Cattaraugus, Orleans or Wyoming Counties.