The Pittsburgh metropolitan area finally has its first passing grade in year-round particle pollution, one of “the most harmful and widespread types of air pollution,” according the American Lung Association’s newest “State of the Air” report. However, the Pittsburgh metropolitan area, which the association defines as 12 counties making up the Pittsburgh-New Castle-Weirton area, still ranks in the nation’s worst 25 metro areas for both year-round (14th worst) and daily (22nd worst) measures of particle pollution.…