{"data":{"id":"us/40-cfr-appendix-a-to-part-68","jurisdiction":"us","citation":"40 CFR Appendix A to Part 68","heading":"Appendix A to Part 68—Table of Toxic Endpoints","body":"[As defined in § 68.22 of this part]\nCAS No. Chemical name Toxic endpoint (mg/L)\n107-02-8 Acrolein [2-Propenal] 0.0011\n107-13-1 Acrylonitrile [2-Propenenitrile] 0.076\n814-68-6 Acrylyl chloride [2-Propenoyl chloride] 0.00090\n107-18-6 Allyl alcohol [2-Propen-1-ol] 0.036\n107-11-9 Allylamine [2-Propen-1-amine] 0.0032\n7664-41-7 Ammonia (anhydrous) 0.14\n7664-41-7 Ammonia (conc 20% or greater) 0.14\n7784-34-1 Arsenous trichloride 0.010\n7784-42-1 Arsine 0.0019\n10294-34-5 Boron trichloride [Borane, trichloro-] 0.010\n7637-07-2 Boron trifluoride [Borane, trifluoro-] 0.028\n353-42-4 Boron trifluoride compound with methyl ether (1:1) [Boron, trifluoro[oxybis[methane]]-, T-4 0.023\n7726-95-6 Bromine 0.0065\n75-15-0 Carbon disulfide 0.16\n7782-50-5 Chlorine 0.0087\n10049-04-4 Chlorine dioxide [Chlorine oxide (ClO2)] 0.0028\n67-66-3 Chloroform [Methane, trichloro-] 0.49\n542-88-1 Chloromethyl ether [Methane, oxybis[chloro-] 0.00025\n107-30-2 Chloromethyl methyl ether [Methane, chloromethoxy-] 0.0018\n4170-30-3 Crotonaldehyde [2-Butenal] 0.029\n123-73-9 Crotonaldehyde, (E)-, [2-Butenal, (E)-] 0.029\n506-77-4 Cyanogen chloride 0.030\n108-91-8 Cyclohexylamine [Cyclohexanamine] 0.16\n19287-45-7 Diborane 0.0011\n75-78-5 Dimethyldichlorosilane [Silane, dichlorodimethyl-] 0.026\n57-14-7 1,1-Dimethylhydrazine [Hydrazine, 1,1-dimethyl-] 0.012\n106-89-8 Epichlorohydrin [Oxirane, (chloromethyl)-] 0.076\n107-15-3 Ethylenediamine [1,2-Ethanediamine] 0.49\n151-56-4 Ethyleneimine [Aziridine] 0.018\n75-21-8 Ethylene oxide [Oxirane] 0.090\n7782-41-4 Fluorine 0.0039\n50-00-0 Formaldehyde (solution) 0.012\n110-00-9 Furan 0.0012\n302-01-2 Hydrazine 0.011\n7647-01-0 Hydrochloric acid (conc 37% or greater) 0.030\n74-90-8 Hydrocyanic acid 0.011\n7647-01-0 Hydrogen chloride (anhydrous) [Hydrochloric acid] 0.030\n7664-39-3 Hydrogen fluoride/Hydrofluoric acid (conc 50% or greater) [Hydrofluoric acid] 0.016\n7783-07-5 Hydrogen selenide 0.00066\n7783-06-4 Hydrogen sulfide 0.042\n13463-40-6 Iron, pentacarbonyl- [Iron carbonyl (Fe(CO)5), (TB-5-11)-] 0.00044\n78-82-0 Isobutyronitrile [Propanenitrile, 2-methyl-] 0.14\n108-23-6 Isopropyl chloroformate [Carbonochloride acid, 1-methylethyl ester] 0.10\n126-98-7 Methacrylonitrile [2-Propenenitrile, 2-methyl-] 0.0027\n74-87-3 Methyl chloride [Methane, chloro-] 0.82\n79-22-1 Methyl chloroformate [Carbonochloridic acid, methylester] 0.0019\n60-34-4 Methyl hydrazine [Hydrazine, methyl-] 0.0094\n624-83-9 Methyl isocyanate [Methane, isocyanato-] 0.0012\n74-93-1 Methyl mercaptan [Methanethiol] 0.049\n556-64-9 Methyl thiocyanate [Thiocyanic acid, methyl ester] 0.085\n75-79-6 Methyltrichlorosilane [Silane, trichloromethyl-] 0.018\n13463-39-3 Nickel carbonyl 0.00067\n7697-37-2 Nitric acid (conc 80% or greater) 0.026\n10102-43-9 Nitric oxide [Nitrogen oxide (NO)] 0.031\n8014-95-7 Oleum (Fuming Sulfuric acid) [Sulfuric acid, mixture with sulfur trioxide] 0.010\n79-21-0 Peracetic acid [Ethaneperoxoic acid] 0.0045\n594-42-3 Perchloromethylmercaptan [Methanesulfenyl chloride, trichloro-] 0.0076\n75-44-5 Phosgene [Carbonic dichloride] 0.00081\n7803-51-2 Phosphine 0.0035\n10025-87-3 Phosphorus oxychloride [Phosphoryl chloride] 0.0030\n7719-12-2 Phosphorus trichloride [Phosphorous trichloride] 0.028\n110-89-4 Piperidine 0.022\n107-12-0 Propionitrile [Propanenitrile] 0.0037\n109-61-5 Propyl chloroformate [Carbonochloridic acid, propylester] 0.010\n75-55-8 Propyleneimine [Aziridine, 2-methyl-] 0.12\n75-56-9 Propylene oxide [Oxirane, methyl-] 0.59\n7446-09-5 Sulfur dioxide (anhydrous) 0.0078\n7783-60-0 Sulfur tetrafluoride [Sulfur fluoride (SF4), (T-4)-] 0.0092\n7446-11-9 Sulfur trioxide 0.010\n75-74-1 Tetramethyllead [Plumbane, tetramethyl-] 0.0040\n509-14-8 Tetranitromethane [Methane, tetranitro-] 0.0040\n7750-45-0 Titanium tetrachloride [Titanium chloride (TiCl4) (T-4)-] 0.020\n584-84-9 Toluene 2,4-diisocyanate [Benzene, 2,4-diisocyanato-1-methyl-] 0.0070\n91-08-7 Toluene 2,6-diisocyanate [Benzene, 1,3-diisocyanato-2-methyl-] 0.0070\n26471-62-5 Toluene diisocyanate (unspecified isomer) [Benzene, 1,3-diisocyanatomethyl-] 0.0070\n75-77-4 Trimethylchlorosilane [Silane, chlorotrimethyl-] 0.050\n108-05-4 Vinyl acetate monomer [Acetic acid ethenyl ester] 0.26","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 68—CHEMICAL ACCIDENT PREVENTION PROVISIONS"],"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":"647ae8f2c870b187404a7b44a5d51f570b7531fd9cf952fcbda63856ac0b7230","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-68.220","next":"us/40-cfr-69.11"},"notice":"GroundRules: Original legal text. Not legal advice."}