Ambient Concentrations for Eastern U.S.

Year	Gaseous Sulfur Dioxide	Particulate Sulfate	Gaseous Nitric Acid	Particulate Nitrate	Total Nitrate (Nitric Acid + Nitrate)	Particulate Ammonium
06-08
89-91
2008
2007
2006
2005
2004
2003
2002
2001
2000
1999
1998
1997
1996
1995
1994
1993
1992
1991
1990
1989