{"data":{"id":"us/40-cfr-57.504","jurisdiction":"us","citation":"40 CFR 57.504","heading":"Continuing evaluation of fugitive emission control measures.","body":"Each NSO shall require the smelter owner to conduct an active program to continuously review the effectiveness of the fugitive emission control measures implemented pursuant to § 57.503 in maintaining the NAAQS and, if such measures are not sufficiently effective, to evaluate what additional measures should be taken to assure that the NAAQS will be maintained with a reasonably degree of reliability. The NSO shall also require submission of a semi-annual report to the issuing Agency detailing the results of this review and evaluation. Such a report may be submitted as part of the report required under § 57.402(f).","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 57—PRIMARY NONFERROUS SMELTER ORDERS","Subpart E—Fugitive Emission Evaluation and Control"],"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":"e7ea1ad0c0ef657c4f009d0a33a7fdd38e4baa07e03a7bd83b8969129f7f7dc0","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-57.503","next":"us/40-cfr-57.505"},"notice":"GroundRules: Original legal text. Not legal advice."}