CFR > Title 40 > Chapter I > Subchapter N > Part 421 > Subpart Q CFR > Title 40 > Chapter I > Subchapter N > Part 421 > Subpart Q – Secondary Indium Subcategory Current as of: 2024 | Check for updates | Other versions § 421.190 Applicability: Description of the secondary indium subcategory § 421.191 Specialized definitions § 421.194 Standards of performance for new sources § 421.195 Pretreatment standards for existing sources § 421.196 Pretreatment standards for new sources
