{"data":{"id":"us/40-cfr-63.1449","jurisdiction":"us","citation":"40 CFR 63.1449","heading":"By what dates must I conduct performance tests or other initial compliance demonstrations?","body":"(a) As required in § 63.7(a)(2), you must conduct a performance test within 180 calendar days of the compliance date that is specified in § 63.1443 for your affected source to demonstrate initial compliance with each emission and opacity limit in §§ 63.1444 and 63.1446 that applies to you.\n(b) For each work practice standard and operation and maintenance requirement that applies to you where initial compliance is not demonstrated using a performance test or opacity observation, you must demonstrate initial compliance within 30 calendar days after the compliance date that is specified for your affected source in § 63.1443.","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 QQQ—National Emission Standards for Hazardous Air Pollutants for Primary Copper Smelting"],"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":"f34657a58722b308ed46e61caec9fea11ad99d3a96f651f859d3d8708f88badc","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-63.1448","next":"us/40-cfr-63.1450"},"notice":"GroundRules: Original legal text. Not legal advice."}