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42 U.S. Code § 7671a. Listing of class I and class II substances
(a) List of class I substances
Within 60 days after November 15, 1990, the Administrator shall publish an initial list of class I substances, which list shall contain the following substances:
Group I
chlorofluorocarbon-11 (CFC–11)
chlorofluorocarbon-12 (CFC–12)
chlorofluorocarbon-113 (CFC–113)
chlorofluorocarbon-114 (CFC–114)
chlorofluorocarbon-115 (CFC–115)
Group II
halon-1211
halon-1301
halon-2402
Group III
chlorofluorocarbon-13 (CFC–13)
chlorofluorocarbon-111 (CFC–111)
chlorofluorocarbon-112 (CFC–112)
chlorofluorocarbon-211 (CFC–211)
chlorofluorocarbon-212 (CFC–212)
chlorofluorocarbon-213 (CFC–213)
chlorofluorocarbon-214 (CFC–214)
chlorofluorocarbon-215 (CFC–215)
chlorofluorocarbon-216 (CFC–216)
chlorofluorocarbon-217 (CFC–217)
Group IV
carbon tetrachloride
Group V
methyl chloroform
The initial list under this subsection shall also include the isomers of the substances listed above, other than 1,1,2-trichloroethane (an isomer of methyl chloroform). Pursuant to subsection (c), the Administrator shall add to the list of class I substances any other substance that the Administrator finds causes or contributes significantly to harmful effects on the stratospheric ozone layer. The Administrator shall, pursuant to subsection (c), add to such list all substances that the Administrator determines have an ozone depletion potential of 0.2 or greater.