Ketchikan Gateway Borough, Alaska, Air Pollution Sources B

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Abstract: The Environmental Protection Agency (EPA) compiles data on emission tonnages of air pollutants for US counties.  US Air Quality Gradebook ("AirGrades") source sheets such as this one for

Ketchikan Gateway Borough, Alaska, give the percentage contributions from specific air pollution sources.  The Ketchikan Gateway Borough Seat is Ketchikan, Alaska.