National Trends in Sulfur_Dioxide Concentrations in 1990 - 2008
| Year |
Mean |
Number of Trend Sites |
10th Percentile |
90th Percentile |
| 1990 |
0.00802631578947 |
266 |
0.0019 |
0.0145 |
| 1991 |
0.00785187969924 |
266 |
0.0018 |
0.0144 |
| 1992 |
0.00728489974937 |
266 |
0.00183333333333 |
0.0131 |
| 1993 |
0.00719630325814 |
266 |
0.0019 |
0.0127 |
| 1994 |
0.00693327067669 |
266 |
0.0019 |
0.0126 |
| 1995 |
0.0055227443609 |
266 |
0.0016 |
0.0104 |
| 1996 |
0.00550375939849 |
266 |
0.0016 |
0.01 |
| 1997 |
0.00542105263157 |
266 |
0.0016 |
0.0096 |
| 1998 |
0.00528458646616 |
266 |
0.0017 |
0.0096 |
| 1999 |
0.00512844611528 |
266 |
0.0018 |
0.0091 |
| 2000 |
0.00491140350877 |
266 |
0.0017 |
0.0087 |
| 2001 |
0.00460563909774 |
266 |
0.0016 |
0.0082 |
| 2002 |
0.00435789473684 |
266 |
0.0015 |
0.0081 |
| 2003 |
0.00434586466165 |
266 |
0.0015 |
0.0083 |
| 2004 |
0.00413095238095 |
266 |
0.0015 |
0.0074 |
| 2005 |
0.00421127819548 |
266 |
0.0016 |
0.0074 |
| 2006 |
0.00370284461152 |
266 |
0.0013 |
0.0069 |
| 2007 |
0.00356860902255 |
266 |
0.0013 |
0.0064 |
| 2008 |
0.00325612781954 |
266 |
0.0012 |
0.0062 |