Table 28. U.S. Emissions of Halocarbons and Miscellaneous Greenhouse Gases, 1990-1998
(Thousand Metric Tons of Gas)
| Gas | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | P1998 |
| Chlorofluorocarbons (CFCs) | |||||||||
| CFC-11 | 54 | 48 | 45 | 45 | 37 | 36 | 27 | 25 | 20 |
| CFC-12 | 113 | 104 | 81 | 79 | 58 | 52 | 36 | 23 | 9 |
| CFC-113 | 26 | 21 | 17 | 17 | 9 | 9 | * | * | * |
| Other CFCs | 9 | 8 | 7 | 7 | 5 | 5 | 4 | 3 | 3 |
| Halons | 3 | 3 | 3 | 3 | 2 | 3 | 3 | 2 | 2 |
| Hydrochlorofluorocarbons (HCFCs) | |||||||||
| HCFC-22 | 80 | 80 | 80 | 71 | 71 | 74 | 77 | 80 | 78 |
| HCFC-141b | 0 | 0 | 0 | 2 | 7 | 12 | 14 | 12 | 15 |
| HCFC-142b | 0 | 0 | 4 | 9 | 15 | 21 | 28 | 28 | 36 |
| Other HCFCs | 0 | 0 | 1 | 3 | 6 | 7 | 7 | 8 | 9 |
| Hydrofluorocarbons (HFCs) | |||||||||
| HFC-23 | 3 | 3 | 3 | 3 | 3 | 2 | 3 | 3 | 3 |
| HFC-134a | 1 | 1 | 1 | 3 | 5 | 10 | 14 | 18 | 19 |
| Other HFCs | 2 | 1 | 0 | 2 | 5 | 9 | 11 | 13 | 15 |
| Perfluorocarbons (PFCs) | 3 | 3 | 2 | 2 | 2 | 3 | 3 | 3 | 3 |
| Other Chemicals | |||||||||
| Carbon Tetrachloride | 32 | 31 | 22 | 19 | 16 | 5 | * | * | * |
| Methyl Chloroform | 158 | 155 | 108 | 93 | 77 | 46 | 0 | * | * |
| Sulfur Hexafluoride | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 |
| *Less than 500 metric tons of gas. P = preliminary data. Sources: 1990-1997: 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April 1999), web site www.epa.gov/globalwarming/inventory/1999-inv.html. 1998: U.S. Environmental Protection Agency, unpublished data, courtesy of the Office of Air and Radiation; and EIA estimates. |
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