{"data":{"id":"us/40-cfr-421.21","jurisdiction":"us","citation":"40 CFR 421.21","heading":"Specialized definitions.","body":"For the purpose of this subpart:\n(a) Except as provided below, the general definitions, abbreviations and methods of analysis set forth in part 401 of this chapter, shall apply to this subpart.\n(b) The term product shall mean hot aluminum metal.\n(c) If a permittee chooses to analyze for benzo(a)pyrene using any EPA-approved method, any “non-detected” measurements shall be considered zeroes for the purpose of determining compliance with this regulation.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY","Subpart B—Primary Aluminum Smelting Subcategory"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"d3b0ba6dcf4e784082d862f977f7f72a5ccad4202dd328cdb9c47b2ff4bea468","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.20","next":"us/40-cfr-421.22"},"notice":"GroundRules: Original legal text. Not legal advice."}