{"data":{"id":"us/40-cfr-420.21","jurisdiction":"us","citation":"40 CFR 420.21","heading":"Specialized definitions.","body":"As used in this subpart:\n(a) For the sintering subcategory, the term product means sinter agglomerated from iron-bearing materials.\n(b) The term dry air pollution control system means an emission control system that utilizes filters to remove iron-bearing particles (fines) from blast furnace or sintering off-gases.\n(c) The term minimum level (ML) means the level at which the analytical system gives recognizable signals and an acceptable calibration point. For 2,3,7,8-tetrachlorodibenzofuran, the minimum level is 10 pg/L per EPA Method 1613B for water and wastewater samples.\n(d) The term pg/L means picograms per liter (ppt = 1.0 × 10-12 gm/L).\n(e) The term sintering means a process for agglomerating iron-bearing materials into small pellets (sinter) that can be charged to a blast furnace.\n(f) The term wet air pollution control system means an emission control system that utilizes water to clean process or furnace off-gases.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 420—IRON AND STEEL MANUFACTURING POINT SOURCE CATEGORY","Subpart B—Sintering 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":"e8df95e7f26b99b08c39294ce54eefdb7fec8a223c07ed053221aeb2e0cf89e6","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-420.20","next":"us/40-cfr-420.22"},"notice":"GroundRules: Original legal text. Not legal advice."}