TABLE 15-1a Change in Air Pollutant Emissions by Type: 1992-2002

TABLE 15-1a Change in Air Pollutant Emissions by Type: 1992-2002

1992 = 100

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All modes 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002
Carbon monoxide 100 95 90 85 80 77 75 71 70 65 62
Nitrogen oxides 100 99 98 97 96 96 95 91 92 87 82
Volatile organic compounds 100 95 90 84 79 77 76 74 70 66 62
PM-10 100 97 94 91 88 85 82 78 75 71 69
PM-2.5 100 97 94 90 86 83 79 75 71 67 65
Lead 100 94 93 97 90 90 89 92 97 N N
Ammonia 100 107 114 122 127 141 137 143 147 149 154

KEY: N = data are nonexistent; PM-10 = particulate matter of 10 microns in diameter or smaller; PM-2.5 = particulate matter of 2.5 microns in diameter or smaller.

NOTE: To make it easier to compare data of differing magnitudes over time, the Bureau of Transportation Statistics divided the data for all years in each category (see table 15-1b) by the initial year value and multiplied the result by 100.

SOURCE: U.S. Department of Transportation, Research and Innovative Technoloy Administration, Bureau of Transportation Statistics, calculations using data in table 15-1b.