Phaseout of Class I Ozone-Depleting Substances
In the United States, “Class I” substances were subject to the first round of phaseout targets. Class I substances have an ozone depletion potential (ODP) of 0.2 or higher, and include halons, chlorofluorocarbons (CFCs), methyl chloroform, carbon tetrachloride, and methyl bromide.
Section 604 of the Clean Air Act sets the phaseout targets for Class I substances. The ban on production and import of halons took effect on January 1, 1994. The ban on production and import of other Class I ODS – excluding methyl bromide – took effect on January 1, 1996.
Section 604 also includes various exemptions from the phaseout.
Date (Jan. 1) | CFCs | Halons | Carbon Tetrachloride | Methyl Chloroform | Methyl Bromide | HBFCs |
---|---|---|---|---|---|---|
1994 | 75% | 100% | 50% | 50% | 0% | 0% |
1995 | 75% | 85% | 70% | 0% | 0% | |
1996 | 100% | 100% | 100% | 0% | 100% | |
1997 | 0% | |||||
1998 | 0% | |||||
1999 | 25% | |||||
2000 | 25% | |||||
2001 | 50% | |||||
2002 | 50% | |||||
2003 | 70% | |||||
2004 | 70% | |||||
2005 | 100% |
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Regulations and Federal Register Notices
Allowances for Export to Article V Countries
- Proposed Rule (August 23, 2006; 71 FR 49395)
- Proposed Rule (September 21, 2005; 70 FR 55480)
- Final Rule (December 29, 2005, 70 FR 77042)