Figure 15 Index of Key Air Pollutant Emissions from U.S. Transportation: 1975-2000
Tuesday, December 27, 2011
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
| Year | CO | NOx | VOC | PM-10 | PM-2.5 | Ammonia | Lead |
|---|---|---|---|---|---|---|---|
| 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.