Oregon air pollution stats

County	First data available	Last data available
Baker Co	2005	2006
Benton Co	1999	2006
Clackamas Co	1997	2006
Columbia Co	1997	2006
Deschutes Co	1997	2007
Douglas Co	2005	2006
Grant Co	2005	2006
Harney Co	2000	2007
Jackson Co	1997	2007
Josephine Co	1997	2007
Klamath Co	1997	2007
Lake Co	1997	2007
Lane Co	1997	2007
Lincoln Co	2003	2004
Linn Co	1999	2006
Marion Co	1997	2006
Multnomah Co	1997	2007
Umatilla Co	1997	2007
Union Co	1997	2007
Wallowa Co	2002	2006
Wasco Co	1999	2006
Washington Co	1999	2007