Figure 15
Index of Key Air Pollutant Emissions from U.S. Transportation: 1975-2000
(Index: 1975= 1.0, 1990 = 1.0 for PM-2.5 and ammonia)
Excel |
CSV |
Graphic Version
| 1975 |
1.00 |
1.00 |
1.00 |
1.00 |
|
|
1.00 |
| 1976 |
1.00 |
1.03 |
0.96 |
1.00 |
|
|
1.08 |
| 1977 |
1.01 |
1.05 |
0.97 |
1.00 |
|
|
1.01 |
| 1978 |
1.02 |
1.08 |
0.93 |
0.99 |
|
|
0.84 |
| 1979 |
0.96 |
1.05 |
0.87 |
0.95 |
|
|
0.74 |
| 1980 |
0.94 |
1.04 |
0.87 |
0.92 |
|
|
0.48 |
| 1981 |
0.92 |
1.01 |
0.85 |
0.83 |
|
|
0.34 |
| 1982 |
0.92 |
0.99 |
0.86 |
0.81 |
|
|
0.32 |
| 1983 |
0.95 |
0.99 |
0.88 |
0.80 |
|
|
0.25 |
| 1984 |
0.95 |
0.99 |
0.88 |
0.84 |
|
|
0.23 |
| 1985 |
0.94 |
1.02 |
0.91 |
0.89 |
|
|
0.14 |
| 1986 |
0.88 |
0.94 |
0.83 |
0.83 |
|
|
0.08 |
| 1987 |
0.86 |
0.93 |
0.80 |
0.89 |
|
|
0.03 |
| 1988 |
0.87 |
0.99 |
0.82 |
0.93 |
|
|
0.02 |
| 1989 |
0.82 |
1.01 |
0.72 |
0.94 |
|
|
0.01 |
| 1990 |
0.73 |
0.99 |
0.66 |
0.93 |
1.00 |
1.00 |
0.01 |
| 1991 |
0.78 |
1.03 |
0.68 |
0.94 |
1.01 |
1.05 |
0.00 |
| 1992 |
0.76 |
1.05 |
0.64 |
0.94 |
1.00 |
1.10 |
0.00 |
| 1993 |
0.77 |
1.07 |
0.65 |
0.89 |
0.94 |
1.16 |
0.00 |
| 1994 |
0.78 |
1.09 |
0.67 |
0.88 |
0.92 |
1.23 |
0.00 |
| 1995 |
0.69 |
1.08 |
0.60 |
0.79 |
0.82 |
1.33 |
0.00 |
| 1996 |
0.73 |
1.20 |
0.62 |
0.87 |
0.96 |
1.23 |
0.00 |
| 1997 |
0.72 |
1.22 |
0.61 |
0.85 |
0.93 |
1.37 |
0.00 |
| 1998 |
0.71 |
1.21 |
0.61 |
0.82 |
0.89 |
1.35 |
0.00 |
| 1999 |
0.68 |
1.19 |
0.60 |
0.79 |
0.85 |
1.36 |
0.00 |
| 2000 |
0.66 |
1.14 |
0.57 |
0.75 |
0.80 |
1.38 |
0.00 |
Key: PM-10 and PM-2.5 =
airborne particulates of less than 10 microns or 2.5 microns in diameter, respectively.
Note: Transportation emissions include all onroad
mobile sources and the following nonroad mobile sources: recreational vehicles
and boats, airport service equipment, aircraft, commercial marine vessels,
and railroads. Other nonroad sources, e.g., farming equipment, are not included.
Lead estimates include onroad mobile sources only.
Source: U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, National Air Pollutant Trends, available at
http://www.epa.gov/ttn/chief/trends/index.html, as of September 2002.
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