DULUTH, MN (KDAL) - According to the 2013 Air Quality Report from the American Lung Association, Duluth was ranked as the one of the cleanest cities for ozone pollution, with no days of unhealthy ozone reported during the three year period. The report also singled out St. Louis, Lake and Carlton Counties for having no unhealthy ozone pollution days during the same period. Meanwhile, the Twin Cities metro area was on the list as one of the "most polluted cities". The full report can be found online at stateoftheair.org
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