Oklahoma air pollution stats

County	First data available	Last data available
Adair Co	2002	2007
Caddo Co	2000	2007
Canadian Co	1999	2007
Carter Co	1997	2007
Cherokee Co	1999	2007
Cleveland Co	1997	2007
Comanche Co	1997	2007
Cotton Co	2003	2007
Creek Co	2003	2007
Custer Co	1997	2005
Dewey Co	2002	2007
Ellis Co	2002	2006
Garfield Co	1999	2005
Jefferson Co	1999	2006
Johnston Co	2003	2004
Kay Co	1997	2007
Latimer Co	1997	2001
Lincoln Co	2000	2006
Love Co	1999	2006
Marshall Co	1999	2002
Mayes Co	1997	2007
McClain Co	1997	2007
Muskogee Co	1997	2007
Oklahoma Co	1997	2007
Okmulgee Co	1997	1998
Ottawa Co	1999	2007
Pawnee Co	2000	2003
Payne Co	1999	2003
Pittsburg Co	1998	2007
Pottawatomie Co	1999	2000
Seminole Co	2000	2004
Sequoyah Co	2004	2007
Tulsa Co	1997	2007
Woodward Co	1997	1997