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

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BTS Home > Publications > Transportation Statistics Annual Report > 2005 > Appendix B

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.