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Ambient Concentrations
| 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 |  |  |  |  |  |  |