Nebraska air pollution stats

County	First data available	Last data available
Buffalo Co	1997	1998
Cass Co	1997	2007
Cedar Co	1999	2002
Cherry Co	1999	2002
Dawson Co	1997	2007
Deuel Co	1999	2002
Douglas Co	1997	2007
Garden Co	2002	2004
Hall Co	1999	2007
Lancaster Co	1997	2007
Lincoln Co	1999	2005
Otoe Co	1997	1998
Sarpy Co	1999	2006
Scotts Bluff Co	1997	2007
Thomas Co	2002	2004
Thurston Co	2003	2004
Washington Co	1999	2006