{"data":{"id":"us/40-cfr-61.121","jurisdiction":"us","citation":"40 CFR 61.121","heading":"Definitions.","body":"(a) Elemental phosphorus plant or plant means any facility that processes phosphate rock to produce elemental phosphorus. A plant includes all buildings, structures, operations, calciners and nodulizing kilns on one contiguous site.\n(b) Calciner or Nodulizing kiln means a unit in which phosphate rock is heated to high temperatures to remove organic material and/or to convert it to a nodular form. For the purpose of this subpart, calciners and nodulizing kilns are considered to be similar units.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 61—NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS","Subpart K—National Emission Standards for Radionuclide Emissions From Elemental Phosphorus Plants"],"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":"4b742601750265390b116c2b1c90addc0e2a6cad92858394a243272c9478a987","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-61.120","next":"us/40-cfr-61.122"},"notice":"GroundRules: Original legal text. Not legal advice."}