Regulations last checked for updates: Nov 22, 2024

Title 40 - Protection of Environment last revised: Nov 20, 2024
All TitlesTitle 40Chapter IPart 266Appendix Appendix IV - Appendix IV to Part 266—Reference Air Concentrations*
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Appendix Appendix IV - Appendix IV to Part 266—Reference Air Concentrations*
Constituent CAS No. RAC (ug/m 3)
Acetaldehyde75-07-010
Acetonitrile75-05-810
Acetophenone98-86-2100
Acrolein107-02-820
Aldicarb116-06-31
Aluminum Phosphide20859-73-80.3
Allyl Alcohol107-18-65
Antimony7440-36-00.3
Barium7440-39-350
Barium Cyanide542-62-150
Bromomethane74-83-90.8
Calcium Cyanide592-01-830
Carbon Disulfide75-15-0200
Chloral75-87-62
Chlorine (free)0.4
2-Chloro-1,3-butadiene126-99-83
Chromium III16065-83-11000
Copper Cyanide544-92-35
Cresols1319-77-350
Cumene98-82-81
Cyanide (free)57-12-1520
Cyanogen460-19-530
Cyanogen Bromide506-68-380
Di-n-butyl Phthalate84-74-2100
o-Dichlorobenzene95-50-110
p-Dichlorobenzene106-46-710
Dichlorodifluoromethane75-71-8200
2,4-Dichlorophenol120-83-23
Diethyl Phthalate84-66-2800
Dimethoate60-51-50.8
2,4-Dinitrophenol51-28-52
Dinoseb88-85-70.9
Diphenylamine122-39-420
Endosulfan115-29-10.05
Endrin72-20-80.3
Fluorine7782-41-450
Formic Acid64-18-62000
Glycidyaldehyde765-34-40.3
Hexachlorocyclopentadiene77-47-45
Hexachlorophene70-30-40.3
Hydrocyanic Acid74-90-820
Hydrogen Chloride7647-01-17
Hydrogen Sulfide7783-06-43
Isobutyl Alcohol78-83-1300
Lead7439-92-10.09
Maleic Anhydride108-31-6100
Mercury7439-97-60.3
Methacrylonitrile126-98-70.1
Methomyl16752-77-520
Methoxychlor72-43-550
Methyl Chlorocarbonate79-22-11000
Methyl Ethyl Ketone78-93-380
Methyl Parathion298-00-00.3
Nickel Cyanide557-19-720
Nitric Oxide10102-43-9100
Nitrobenzene98-95-30.8
Pentachlorobenzene608-93-50.8
Pentachlorophenol87-86-530
Phenol108-95-230
M-Phenylenediamine108-45-25
Phenylmercuric Acetate62-38-40.075
Phosphine7803-51-20.3
Phthalic Anhydride85-44-92000
Potassium Cyanide151-50-850
Potassium Silver Cyanide506-61-6200
Pyridine110-86-11
Selenious Acid7783-60-83
Selenourea630-10-45
Silver7440-22-43
Silver Cyanide506-64-9100
Sodium Cyanide143-33-930
Strychnine57-24-90.3
1,2,4,5-Tetrachlorobenzene95-94-30.3
2,3,4,6-Tetrachlorophenol58-90-230
Tetraethyl Lead78-00-20.0001
Tetrahydrofuran109-99-910
Thallic Oxide1314-32-50.3
Thallium7440-28-00.5
Thallium (I) Acetate563-68-80.5
Thallium (I) Carbonate6533-73-90.3
Thallium (I) Chloride7791-12-00.3
Thallium (I) Nitrate10102-45-10.5
Thallium Selenite12039-52-00.5
Thallium (I) Sulfate7446-18-60.075
Thiram137-26-85
Toluene108-88-3300
1,2,4-Trichlorobenzene120-82-120
Trichloromonofluoromethane75-69-4300
2,4,5-Trichlorophenol95-95-4100
Vanadium Pentoxide1314-62-120
Warfarin81-81-20.3
Xylenes1330-20-780
Zinc Cyanide557-21-150
Zinc Phosphide1314-84-70.3

*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

[56 FR 7232, Feb. 21, 1991; 56 FR 32691, July 17, 1991, as amended at 71 FR 40277, July 14, 2006]
authority: 42 U.S.C. 1006,2002,3001,3014,3017,6905,6906,6912,6921,6922,6924,6934,and
source: 50 FR 666, Jan. 4, 1985, unless otherwise noted.
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