Last week, the American Lung Association awarded King County a grade of F for its ozone levels, swift on the heels of the county's Clean Air Act violation last summer.So how bad is it? Not as awful as one might assume. It wasn't so much that the county's air got worse as that the standards got stricter (as they should). And though most metropolitan areas span more than one county, the primary counties of every metropolitan area in the country larger than Seattle ranked worse than King County did.But once again we got beat by our smaller neighbor to the south: Portland—rather, Multnomah County—earned a B. And lest one think they simply pushed their pollution north of the Columbia, as they do their sprawl, Vancouver's Clark County got the same impressive score.