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Undo revision 748367 by JoeForest (Talk)
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]].
The [[EPA]] later added HBFCs and methyl bromide to the list by [[regulation]].
==External Links==
*[http://www.epa.gov/ozone/ods.html Table] of class I substances shows their lifetime ODPs, [[global warming potential]]s, and [[CAS number]]s.
[[Category:Chemistry]]
[[Category:Chemistry]]