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A '''Class I substance''' is one of several groups of chemicals given an [[ozone-depletion potential]] (ODP) of 0.2 or higher by the [[Environmental Protection Agency]] (EPA).
A '''Class I substance''' is one of several groups of [[chemical]]s given an [[ozone-depletion potential]] (ODP) of 0.2 or higher by the [[Environmental Protection Agency]] (EPA).
Class I substances listed in the [[Clean Air Act]] include [[chlorofluorocarbon]]s, [[halon]]s, [[carbon tetrachloride]], and [[methyl chloroform]].
Class I substances listed in the [[Clean Air Act]] include [[chlorofluorocarbon]]s, [[halon]]s, [[carbon tetrachloride]], and [[methyl chloroform]].
The [[EPA]] later added HBFCs and methyl bromide to the list by regulation.
The [[EPA]] later added HBFCs and methyl bromide to the list by [[regulation]].
==External Links==
==External Links==