# Dimethyl Sulfoxide; Exemption From the Requirement of a Tolerance
> **Rule** · Final rule. · Published 2022-10-12 · Effective 2022-10-12 · 87 FR 61531
## Document
- **Document number:** 2022-22129
- **Category:** pesticide
- **Federal Register citation:** 87 FR 61531
- **CFR reference:** 40 CFR 180
- **Publication date:** 2022-10-12
- **Effective date:** 2022-10-12
- **EPA docket:** EPA-HQ-OPP-2021-0774
## Abstract

This regulation establishes an exemption from the requirement of a tolerance for residues of dimethyl sulfoxide (CAS Reg. No. 67-68- 5) when used as an inert ingredient (solvent, co-solvent), in pesticide formulations for pre-harvest applications, including post-emergence use. Exponent, Inc., on behalf of Gaylord Chemical Company submitted a petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA), requesting an amendment to an existing tolerance exemption. This regulation eliminates the need to establish a maximum permissible level for residues of dimethyl sulfoxide for pre-harvest applications.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2022/10/12/2022-22129/dimethyl-sulfoxide-exemption-from-the-requirement-of-a-tolerance)
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