This regulation establishes an exemption from the requirement of a tolerance for residues of carbon dioxide (CAS Reg. No. 124-38-9) when used as an inert ingredient as a propellant in pre-harvest and post-harvest applications and when applied to animals. Whitmire Micro- Gen Research Laboratories, Inc., c/o Landis International, Inc. submitted a petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA), requesting establishment of an exemption from the requirement of a tolerance. This regulation eliminates the need to establish a maximum permissible level for residues of carbon dioxide.