KLAMATH FALLS, Ore. – Klamath County still gets an F for air quality. A new report from the American Lung Association grades counties across the country on air pollution levels, and Klamath is one of four counties in Oregon to get the failing grade. The others were Jackson, Lake, and Lane. The American Lung Association attributed that mostly to smoke from wood burning stoves. If a county had more than 10 days per year with EPA-deemed unhealthy air, that was a failing grade. Klamath County had an average of 13 between 2008 and 2010.