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Code of Federal Regulations (Last Updated: July 5, 2024) |
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Title 40 - Protection of Environment |
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Chapter I - Environmental Protection Agency |
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SubChapter I - Solid Wastes |
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Part 266 - Standards for the Management of Specific Hazardous Wastes and Specific Types of Hazardous Waste Management Facilities |
Appendix IV to Part 266 - Reference Air Concentrations*
Latest version.
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Appendix IV to Part 266 - Reference Air Concentrations*
Constituent CAS No. RAC (ug/m3) Acetaldehyde 75-07-0 10 Acetonitrile 75-05-8 10 Acetophenone 98-86-2 100 Acrolein 107-02-8 20 Aldicarb 116-06-3 1 Aluminum Phosphide 20859-73-8 0.3 Allyl Alcohol 107-18-6 5 Antimony 7440-36-0 0.3 Barium 7440-39-3 50 Barium Cyanide 542-62-1 50 Bromomethane 74-83-9 0.8 Calcium Cyanide 592-01-8 30 Carbon Disulfide 75-15-0 200 Chloral 75-87-6 2 Chlorine (free) 0.4 2-Chloro-1,3-butadiene 126-99-8 3 Chromium III 16065-83-1 1000 Copper Cyanide 544-92-3 5 Cresols 1319-77-3 50 Cumene 98-82-8 1 Cyanide (free) 57-12-15 20 Cyanogen 460-19-5 30 Cyanogen Bromide 506-68-3 80 Di-n-butyl Phthalate 84-74-2 100 o-Dichlorobenzene 95-50-1 10 p-Dichlorobenzene 106-46-7 10 Dichlorodifluoromethane 75-71-8 200 2,4-Dichlorophenol 120-83-2 3 Diethyl Phthalate 84-66-2 800 Dimethoate 60-51-5 0.8 2,4-Dinitrophenol 51-28-5 2 Dinoseb 88-85-7 0.9 Diphenylamine 122-39-4 20 Endosulfan 115-29-1 0.05 Endrin 72-20-8 0.3 Fluorine 7782-41-4 50 Formic Acid 64-18-6 2000 Glycidyaldehyde 765-34-4 0.3 Hexachlorocyclopentadiene 77-47-4 5 Hexachlorophene 70-30-4 0.3 Hydrocyanic Acid 74-90-8 20 Hydrogen Chloride 7647-01-1 7 Hydrogen Sulfide 7783-06-4 3 Isobutyl Alcohol 78-83-1 300 Lead 7439-92-1 0.09 Maleic Anhydride 108-31-6 100 Mercury 7439-97-6 0.3 Methacrylonitrile 126-98-7 0.1 Methomyl 16752-77-5 20 Methoxychlor 72-43-5 50 Methyl Chlorocarbonate 79-22-1 1000 Methyl Ethyl Ketone 78-93-3 80 Methyl Parathion 298-00-0 0.3 Nickel Cyanide 557-19-7 20 Nitric Oxide 10102-43-9 100 Nitrobenzene 98-95-3 0.8 Pentachlorobenzene 608-93-5 0.8 Pentachlorophenol 87-86-5 30 Phenol 108-95-2 30 M-Phenylenediamine 108-45-2 5 Phenylmercuric Acetate 62-38-4 0.075 Phosphine 7803-51-2 0.3 Phthalic Anhydride 85-44-9 2000 Potassium Cyanide 151-50-8 50 Potassium Silver Cyanide 506-61-6 200 Pyridine 110-86-1 1 Selenious Acid 7783-60-8 3 Selenourea 630-10-4 5 Silver 7440-22-4 3 Silver Cyanide 506-64-9 100 Sodium Cyanide 143-33-9 30 Strychnine 57-24-9 0.3 1,2,4,5-Tetrachlorobenzene 95-94-3 0.3 2,3,4,6-Tetrachlorophenol 58-90-2 30 Tetraethyl Lead 78-00-2 0.0001 Tetrahydrofuran 109-99-9 10 Thallic Oxide 1314-32-5 0.3 Thallium 7440-28-0 0.5 Thallium (I) Acetate 563-68-8 0.5 Thallium (I) Carbonate 6533-73-9 0.3 Thallium (I) Chloride 7791-12-0 0.3 Thallium (I) Nitrate 10102-45-1 0.5 Thallium Selenite 12039-52-0 0.5 Thallium (I) Sulfate 7446-18-6 0.075 Thiram 137-26-8 5 Toluene 108-88-3 300 1,2,4-Trichlorobenzene 120-82-1 20 Trichloromonofluoromethane 75-69-4 300 2,4,5-Trichlorophenol 95-95-4 100 Vanadium Pentoxide 1314-62-1 20 Warfarin 81-81-2 0.3 Xylenes 1330-20-7 80 Zinc Cyanide 557-21-1 50 Zinc Phosphide 1314-84-7 0.3 [56 FR 7232, Feb. 21, 1991; 56 FR 32691, July 17, 1991, as amended at 71 FR 40277, July 14, 2006]