Utah air pollution stats

County	First data available	Last data available
Box Elder Co	2000	2007
Cache Co	1997	2007
Davis Co	1997	2007
Duchesne Co	2002	2006
Garfield Co	2002	2004
Grand Co	1997	2003
Iron Co	1997	1997
Salt Lake Co	1997	2007
San Juan Co	1997	2007
Tooele Co	1997	2007
Uintah Co	2000	2006
Utah Co	1997	2007
Washington Co	1997	2007
Wayne Co	2002	2004
Weber Co	1997	2007