SUBPART Q—Secondary Indium Subcategory (§421.190 to §421.197)
- 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.