6-4 Index of Key Air Pollutant Emissions from U.S. Transportation: 1990-2006
Tuesday, December 27, 2011
6-4 Index of Key Air Pollutant Emissions from U.S. Transportation: 1990-2006
Index: 1990 = 1.0
Excel | CSV | Graphic Version
| Year | Carbon monoxide CO |
Nitrogen oxide NOx |
Volatile organic compounds VOC |
Particle matters | Surfur dioxide SO2 |
Ammonia NH3 |
|
|---|---|---|---|---|---|---|---|
| PM-10 | PM-2.5 | ||||||
| 1990 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |
| 1991 | 0.95 | 0.99 | 0.94 | 0.96 | 0.95 | 0.93 | 1.09 |
| 1992 | 0.90 | 0.97 | 0.89 | 0.91 | 0.90 | 0.87 | 1.17 |
| 1993 | 0.86 | 0.96 | 0.83 | 0.87 | 0.85 | 0.80 | 1.26 |
| 1994 | 0.81 | 0.94 | 0.78 | 0.83 | 0.81 | 0.73 | 1.35 |
| 1995 | 0.76 | 0.93 | 0.72 | 0.79 | 0.76 | 0.67 | 1.43 |
| 1996 | 0.71 | 0.91 | 0.66 | 0.74 | 0.71 | 0.60 | 1.52 |
| 1997 | 0.69 | 0.92 | 0.64 | 0.71 | 0.67 | 0.60 | 1.71 |
| 1998 | 0.66 | 0.90 | 0.62 | 0.66 | 0.62 | 0.60 | 1.65 |
| 1999 | 0.62 | 0.87 | 0.61 | 0.62 | 0.57 | 0.60 | 1.72 |
| 2000 | 0.62 | 0.88 | 0.57 | 0.59 | 0.54 | 0.52 | 1.77 |
| 2001 | 0.58 | 0.81 | 0.53 | 0.55 | 0.49 | 0.49 | 1.79 |
| 2002 | 0.57 | 0.85 | 0.50 | 0.52 | 0.46 | 0.51 | 1.87 |
| 2003 | 0.55 | 0.81 | 0.47 | 0.51 | 0.44 | 0.48 | 1.91 |
| 2004 | 0.53 | 0.77 | 0.45 | 0.50 | 0.42 | 0.44 | 1.95 |
| 2005 | 0.51 | 0.73 | 0.43 | 0.48 | 0.40 | 0.41 | 2.00 |
| 2006 | 0.49 | 0.69 | 0.41 | 0.47 | 0.38 | 0.37 | 2.05 |
Key: PM-10 and PM-2.5 = airborne particulates of less than 10 microns or 2.5 microns, respectively.
Notes: Data in the previous edition include all onroad mobile sources and some nonroad mobile sources. EPA revised the emissions estimation methodology for onroad mobile sources.
Source: U.S. Environmental Protection Agency, Clearinghouse for Inventories and Emissions Factors (CHIEF), Current Emission Trends Summaries, Internet website http://www.epa.gov/ttn/chief/trends/index.html as of September 2007.