EPA is extending the laboratory and analytical use exemption for the production and import of Class I ozone-depleting substances through December 31, 2014. This action is taken under the Clean Air Act consistent with the recent actions by the Parties to the Montreal Protocol on Substances that Deplete the Ozone Layer. The exemption allows the production and import of controlled substances in the United States for laboratory and analytical uses that have not been already identified by EPA as nonessential.