Table ES1. U.S. Emissions of Greenhouse Gases by Gas, 1990-1998
(Million Metric Tons of Gas)
| Gas | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | P1998 |
| Carbon Dioxide | 4,939.0 | 4,886.0 | 4,972.9 | 5,091.5 | 5,169.7 | 5,220.5 | 5,395.6 | 5,464.9 | 5,483.4 |
| Methane | 30.2 | 30.5 | 30.6 | 29.9 | 30.0 | 30.2 | 29.3 | 29.3 | 28.8 |
| Nitrous Oxide | 1.2 | 1.2 | 1.2 | 1.2 | 1.3 | 1.3 | 1.2 | 1.2 | 1.2 |
| Halocarbons and Other Gases | |||||||||
| CFC-11, CFC-12, CFC-113 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 |
| HCFC-22 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| HFCs, PFCs, and SF6 | * | * | * | * | * | * | * | * | * |
| Methyl Chloroform | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | * | * | * | * |
| Criteria Pollutants That Affect Climate | |||||||||
| Carbon Monoxide | 86.8 | 88.6 | 85.5 | 85.6 | 89.5 | 80.7 | 82.3 | 79.2 | NA |
| Nitrogen Oxides | 21.2 | 21.3 | 21.6 | 21.8 | 22.1 | 21.5 | 21.3 | 21.4 | NA |
| Nonmethane VOCs | 18.9 | 19.0 | 18.6 | 18.8 | 19.4 | 18.6 | 17.4 | 17.3 | NA |
| *Less than 50,000 metric tons of gas. P = preliminary data. NA = not available. Note: Data in this table are revised from the data contained in the previous EIA report, Emissions of Greenhouse Gases in the United States 1997, DOE/EIA-0573(97) (Washington, DC, October 1998). Sources: Carbon dioxide, methane, nitrous oxide emissions: EIA estimates described in Chapters 2, 3, and 4 of this report. Halocarbons and other gases: U.S. Environmental Protection Agency, Inventory of U.S. Greenhouse Gas Emissions and Sinks 1990-1997, EPA-236-R-99-003 (Washington, DC, April 1999), p. ES-2, web site www.epa.gov/globalwarming/inventory/1999-inv.html. Criteria pollutants: U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, National Air Pollutant Emission Trends Update, 1900-1997, EPA-454-R-98-007 (Research Triangle Park, NC, December 1998), Tables A-1-A-3, pp. A-2-A-18, web site www. epa.gov/ttn/chief/trends97/emtmd.html. | |||||||||