BOSTON (AP) - More than a third of Massachusetts residents live in a county with failing air quality.
That's one of the findings of a new report on ozone levels by the American Lung Association.
The report released Wednesday found that of the 12 Massachusetts' counties with air quality monitors, five have improved their grades for ozone pollution while six received an F.
Those counties that improved the ozone grade include Berkshire, Barnstable, Middlesex, Norfolk and Suffolk,
Those counties receiving an "F'' for ozone pollution include Hampden, Hampshire, Worcester, Essex, Dukes and Bristol,
Plymouth doesn't have an ozone pollution monitor but earned an "A'' for short-term particle pollution, according to the report.
Jeff Seyler, president of the American Lung Association in the Northeast, said Massachusetts shouldn't be lulled into a false sense of security.