South Dakota air pollution stats

County	First data available	Last data available
Brookings Co	1997	2007
Brown Co	2000	2007
Codington Co	2003	2007
Custer Co	2002	2007
Jackson Co	2000	2007
Meade Co	2001	2007
Minnehaha Co	1997	2007
Pennington Co	1997	2007
Roberts Co	2001	2002