The substitute addressed in this final rule (i.e., R-152a) is for the motor vehicle air conditioning (MVAC) end-use within the refrigeration and air-conditioning sector. This substitute does not pose significantly more risk than other substitutes that are available in this end use. Additionally, this substitute is a non ozone-depleting gas and consequently does not contribute to stratospheric ozone depletion. This final rule is effective on August 11, 2008. POC is Karen Thundiyil, Stratospheric Protection Division, Office of Air and Radiation, MC 6205J, Environmental Protection Agency, 1200 Pennsylvania Ave., NW., Washington, DC 20460; telephone number: (202) 343-9464; fax number: (202) 343-2363; e-mail address: thundiyil.karen@epa.gov (Federal Register: June 12, 2008 [Rules and Regulations], Page 33304-33311).