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Ambient Air Concentrations

Year

Sulfur dioxide

Particulate Sulfate

Particulate Ammonium

Total Nitrate (Nitric Acid + Nitrate)

Nitric Acid

Particulate Nitrate

2012-2014
2009-2011
1999-2001
1989-1991
2014
2013
2012
2011
2010
2009
2008
2007
2006
2005
2004
2003
2002
2001
2000
1999
1998
1997
1996
1995
1994
1993
1992
1991
1990
1989

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