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| Table 1. Estimated 1994 Sales
and Emissions of CFCs and Other Greenhouse Gases
(Thousand Metric Tons) |
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| Compound | Chemical Formula |
100-Year Global Warming Potential (CO2< "/sub">=1) |
1994 U.S. Sales |
1994 TRI Emissions |
1994 U.S. Emissions |
Principal Uses |
| Chlorofluorocarbons (CFCs) | ||||||
| Trichlorofluoromethane (CFC-11) | CFCl3 |
1,320 | 7.3 | 1.4 | 37.0 | Blowing agent, chillers |
| Dichlorodifluoromethane (CFC-12) | CF2Cl2 |
6,650 | 40.0 | 2.2 | 71.0 | Auto air conditioners, chillers, blowing agent |
| Freon 113 (CFC-113) | C2F3Cl3 |
9,300 | NA | 2.3 | 17.0 | Solvent |
| CFC-114 | C2F4Cl2 |
9,300 | NA | 0.6 | 5.0 | Solvent |
| CFC-115 | C2F5Cl |
9,300 | NA | 0.1 | 3.0 | Solvent, refrigerant |
| Hydrochlorofluorocarbons | ||||||
| Chlorodifluoromethane (HCFC-22) | CF2HCl |
1,350 | 97.3 | 3.6 | 91.2 | Residential air conditioners |
| HCFC-123 | C2F3HCl2 |
93 | NA | 2.4 | 2.0 | Refrigerant |
| HCFC-124 | C2F4HCl |
480 | NA | 0.4 | 2.0 | Sterilant |
| HCFC-141b | C2H3FCl2 |
270 | NA | 3.5 | 16.0 | CFC replacement |
| Chlorodifluoroethane (HCFC-142b) | C2H3F2Cl |
1,650 | NA | 2.6 | 10.0 | CFC replacement |
| Bromofluorocarbons (Halons) | ||||||
| Halon-1211 | CClF2Br |
NA | NA | -- | 1.0 | Fire extinguisher |
| Halon-1301 | CF3Br |
-31,400 | a<4 | -- | 2.0 | Fire extinguisher |
| Hydrofluorocarbons (HFCs) | ||||||
| HFC-23 | CHF3 |
11,700 | NA | NA | 4.2 | HCFC byproduct |
| HFC-125 | C2HF5 |
2,800 | NA | NA | 1.1 | CFC/HCFC replacement |
| HFC-134a | CH2FCF3 |
1,300 | a26 | NA | 10.4 | Air conditioners, refrigeration |
| HFC-152a | C2H4F2 |
140 | NA | NA | 1.5 | Aerosol propellant |
| HFC-227ea | C3HF7 |
2,900 | NA | NA | 0.9 | CFC replacement |
| Perfluorocarbons (PFCs) | ||||||
| Perfluoromethane | CF4 |
6,900 | a<1 | NA | 2.0 | Byproduct |
| Perfluoroethane | C2F6 |
9,200 | NA | NA | 0.2 | Byproduct, solvent |
| Other Chemicals | ||||||
| Carbon Tetrachloride | CCl4 |
-1,550 | 39.9 | 0.3 | 16.0 | CFC feedstock, solvents |
| Methyl Chloroform | C23H3 |
-700 | 166.1 | 17.3 | 78.0 | Solvent |
| Methylene Chloride | CH2Cl2 |
9 | 119.4 | 28.9 | 28.9 | Solvent |
| Chloroform | CHCl3 |
5 | 217.5 | 5.2 | 5.2 | HCFC feedstock |
| Sulfur Hexafluoride | SF6 |
23,900 | 6.0 | NA | 1.0 | Insulator, cover gas |
| aEIA estimate. NA = not available. -- = less than 500 metric tons. Sources: Chemical formulae and global warming potentials from Intergovernmental Panel on Climate Change, Climate Change 1995: The Science of Climate Change (Cambridge, UK: Cambridge University Press, 1996), pp. 119 and 121. Production and sales of CFCs and other chemicals from International Trade Commission, Synthetic Organic Chemicals: United States Production and Sales, 1994 (Washington, DC, 1995). TRI emissions from U.S. Environmental Protection Agency, 1994 Toxics Release Inventory: Public Data Release, EPA-745-R-94-001 (Washington, DC, June 1996), p. 73. Estimated 1994 U.S. emissions from U.S. Environmental Protection Agency, Inventory of U.S. Greenhouse Gas Emissions and Sinks, 1990-1994, EPA-230-R-96-006 (Washington, DC, November 1995), pp. 37-40. |
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| Table 2. Estimated U.S. Emissions of
Halocarbons and Miscellaneous Greenhouse Gases, 1988-1995
(Thousand Metric Tons of Gas) |
||||||||
| Gas | 1988 | 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | P1995 |
| Chlorofluorocarbons (CFCs) | ||||||||
| CFC-11 | 85 | 80 | 60 | 54 | 48 | 39 | 37 | 8 |
| CFC-12 | 110 | 114 | 112 | 108 | 102 | 99 | 71 | 66 |
| CFC-113 | 83 | 78 | 50 | 39 | 28 | 20 | 17 | 6 |
| Other CFCs | NA | NA | 9 | 9 | 9 | 8 | 8 | 7 |
| Halons | NA | NA | 3 | 3 | 3 | 3 | 3 | 2 |
| Hydrochlorofluorocarbons (HCFCs) | ||||||||
| HCFC-22 | 74 | 76 | 82 | 82 | 86 | 89 | 91 | 91 |
| HCFC-141b | 0 | 0 | 0 | 1 | 3 | 8 | 16 | 21 |
| HCFC-142b | 0 | 0 | 0 | 3 | 3 | 6 | 10 | 16 |
| Other HCFCs | NA | NA | 2 | 3 | 3 | 4 | 4 | 8 |
| Hydrofluorocarbons (HFCs) | ||||||||
| HFC-23 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 |
| HFC-134a | NA | NA | 1 | 1 | 3 | 6 | 10 | 16 |
| HFC-152a | NA | NA | NA | NA | 1 | 1 | 2 | 3 |
| Other HFCs | NA | NA | NA | NA | NA | NA | 2 | 2 |
| Perfluorocarbons (PFCs) | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 |
| Other Chemicals | ||||||||
| Carbon Tetrachloride | NA | NA | 30 | NA | 26 | 22 | 16 | NA |
| Methyl Chloroform | 323 | 296 | 316 | 224 | 215 | 122 | 78 | 32 |
| Sulfur Hexafluoride | NA | NA | 1 | 1 | 1 | 1 | 1 | 1 |
| P = preliminary data. NA = not available. Sources: 1990 and 1994 emissions estimates from U.S. Environmental Protection Agency |
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File last modified: January 4, 2001
Contact: especialgas@c-f-c.com