U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 40Chapter IPart 421Subpart Q - Subpart Q—Secondary Indium Subcategory
§ 421.190 - Applicability: Description of the secondary indium subcategory.
§ 421.191 - Specialized definitions.
§§ 421.192-421.193 - §[Reserved]
§ 421.194 - Standards of performance for new sources.
§ 421.195 - Pretreatment standards for existing sources.
§ 421.196 - Pretreatment standards for new sources.
§ 421.197 - [Reserved]
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