This regulation establishes a time-limited tolerance for residues of fluensulfone, measured as 3,4,4-trifluoro-but-3-ene-1- sulfonic acid, resulting from use of fluensulfone in or on carrots in accordance with the terms of an emergency exemption issued under section 18 of the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA). This action is in response to the issuance of a crisis emergency exemption under FIFRA section 18 authorizing use of the pesticide on carrots. This regulation establishes a maximum permissible level for residues of fluensulfone in or on carrots. The time-limited tolerance expires on December 31, 2017.