Ohio air pollution stats

County	First data available	Last data available
Adams Co	1997	2007
Allen Co	1997	2007
Ashtabula Co	1997	2007
Athens Co	1997	2007
Belmont Co	1997	2007
Butler Co	1997	2007
Clark Co	1997	2007
Clermont Co	1997	2007
Clinton Co	1997	2007
Columbiana Co	1997	2007
Cuyahoga Co	1997	2007
Delaware Co	1997	2007
Erie Co	1998	1999
Franklin Co	1997	2007
Gallia Co	2001	2006
Geauga Co	1997	2007
Greene Co	1997	2007
Hamilton Co	1997	2007
Hancock Co	1997	2007
Jefferson Co	1997	2007
Knox Co	1997	2007
Lake Co	1997	2007
Lawrence Co	1997	2007
Licking Co	1997	2007
Logan Co	1997	1999
Lorain Co	1997	2007
Lucas Co	1997	2007
Madison Co	1997	2007
Mahoning Co	1997	2007
Medina Co	1997	2007
Meigs Co	1997	2007
Miami Co	1997	2007
Monroe Co	1997	2004
Montgomery Co	1997	2007
Morgan Co	1997	2007
Noble Co	1997	2004
Ottawa Co	1997	2001
Portage Co	1997	2007
Preble Co	1997	2007
Richland Co	1997	2000
Sandusky Co	1997	2001
Scioto Co	1997	2007
Seneca Co	1997	2004
Stark Co	1997	2007
Summit Co	1997	2007
Trumbull Co	1997	2007
Tuscarawas Co	1997	2007
Union Co	1997	1999
Warren Co	1997	2007
Washington Co	1997	2007
Wood Co	1997	2007
Wyandot Co	1997	2007