{"data":{"id":"us/40-cfr-table-4-to-subpart-ppppp-of-part-63","jurisdiction":"us","citation":"40 CFR Table 4 to Subpart PPPPP of Part 63","heading":"Table 4 to Subpart PPPPP of Part 63—Initial Compliance With Emission Limitations","body":"As stated in § 63.9330, you must demonstrate initial compliance with each emission limitation that applies to you according to the following table:\nFor the . . . You have demonstrated initial compliance if . . .\n1. CO or THC concentration emission limitation The first 4-hour rolling average CO or THC concentration is 20 ppmvd or less, corrected to 15 percent O2 content if CEMS are installed or the average of the test run averages during the performance test is 20 ppmvd or less, corrected to 15 percent O2 content.\n2. CO or THC percent reduction emission limitation The first 4-hour rolling average reduction in CO or THC is 96 percent or more, dry basis, corrected to 15 percent O2 content.","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 PPPPP—National Emission Standards for Hazardous Air Pollutants for Engine Test Cells/Stands"],"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":"bf86a20eb87060591f96e367067885f71a6b9592784555654b1a940ade2b0ddd","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-table-3-to-subpart-ppppp-of-part-63","next":"us/40-cfr-table-5-to-subpart-ppppp-of-part-63"},"notice":"GroundRules: Original legal text. Not legal advice."}