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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.

Table 1: Phaseout Schedule for Class I Substances
(in percent reduction from baseline)
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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