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Regulations last checked for updates: Jul 02, 2026
Title 40 - Protection of Environment last revised: Aug 02, 2026
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Title 40
Chapter I
Part 421
Subpart Y - Subpart Y—Primary Rare Earth Metals Subcategory
§ 421.270 - Applicability: Description of the primary rare earth metals subcategory.
§ 421.271 - Specialized definitions.
§§ 421.272-421.273 - §[Reserved]
§ 421.274 - Standards of performance for new sources.
§ 421.275 - Pretreatment standards for existing sources.
§ 421.276 - Pretreatment standards for new sources.
§ 421.277 - [Reserved]
source:
49 FR 8790, Mar. 8, 1984, unless otherwise noted.
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