{"data":{"id":"us/40-cfr-table-5-to-subpart-fffff-of-part-63","jurisdiction":"us","citation":"40 CFR Table 5 to Subpart FFFFF of Part 63","heading":"Table 5 to Subpart FFFFF of Part 63—Toxic Equivalency Factors","body":"As stated in § 63.7825(u), you must demonstrate compliance with each dioxin/furan emission limit that applies to you by calculating the sum of the 2,3,7,8-TCDD TEQs using the 2005 World Health Organization (WHO) toxicity equivalence factors (TEF) presented in the following table:\nFor each dioxin/furan congener . . . You must calculate its 2,3,7,8-TCDD TEQ using the following TEF . . .\n2,3,7,8-tetrachlorodibenzo-p-dioxin 1\n1,2,3,7,8-pentachlorodibenzo-p-dioxin 1\n1,2,3,4,7,8-hexachlorodibenzo-p-dioxin 0.1\n1,2,3,7,8,9-hexachlorodibenzo-p-dioxin 0.1\n1,2,3,6,7,8-hexachlorodibenzo-p-dioxin 0.1\n1,2,3,4,6,7,8-heptachlorodibenzo-p-dioxin 0.01\nOctachlorodibenzo-p-dioxin 0.0003\n2,3,7,8-tetrachlorodibenzofuran 0.1\n1,2,3,7,8-pentachlorodibenzofuran 0.03\n2,3,4,7,8-pentachlorodibenzofuran 0.3\n1,2,3,4,7,8-hexachlorodibenzofuran 0.1\n1,2,3,6,7,8-hexachlorodibenzofuran 0.1\n1,2,3,7,8,9-hexachlorodibenzofuran 0.1\n2,3,4,6,7,8-hexachlorodibenzofuran 0.1\n1,2,3,4,6,7,8-heptachlorodibenzofuran 0.01\n1,2,3,4,7,8,9-heptachlorodibenzofuran 0.01\nOctachlorodibenzofuran 0.0003","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 FFFFF—National Emission Standards for Hazardous Air Pollutants for Integrated Iron and Steel Manufacturing Facilities"],"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":"4c5ab81660b4c5ba30796a9db337caddcbdd81c100a1f7b1b24c96d4a244b512","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-table-4-to-subpart-fffff-of-part-63","next":"us/40-cfr-table-6-to-subpart-fffff-of-part-63"},"notice":"GroundRules: Original legal text. Not legal advice."}