{"data":{"id":"us/40-cfr-63.9912","jurisdiction":"us","citation":"40 CFR 63.9912","heading":"When must I conduct subsequent performance tests?","body":"You must conduct subsequent performance tests to demonstrate continuous compliance with all applicable emission limits in Table 1 to this subpart no less frequently than twice (at mid-term and renewal) during each term of your title V operating permit.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 63—NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES","Subpart TTTTT—National Emissions Standards for Hazardous Air Pollutants for Primary Magnesium Refining"],"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":"3923789bbd5ff88d9d77f311709148c9f4e3ce152dff74fdb5289e99be8d54db","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-63.9911","next":"us/40-cfr-63.9913"},"notice":"GroundRules: Original legal text. Not legal advice."}