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Appendix IV to Part 266—Reference Air Concentrations*

RegSenseHazardous WasteWaste/HazWasteCFR RegulationsWasteEnvironmental Protection Agency (EPA)Special WasteEnvironmentalSolid WasteUSAEnglishFocus AreaCFR Appendix

Constituent CAS No. RAC (ug/m 3 )
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

*The RAC for other appendix VIII part 261 constituents not listed herein or in appendix V of this part is 0.1 ug/m 3 .

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