Federal regulations · Through 2026-08-25 · Newer source version available

40 CFR Table 1 to Subpart DD of Part 63: Table 1 to Subpart DD of Part 63—List of Hazardous Air Pollutants (HAP) for Subpart DD

CAS No. a Chemical name fm 305
75-07-0 Acetaldehyde 1.000
75-05-8 Acetonitrile 0.989
98-86-2 Acetophenone 0.314
107-02-8 Acrolein 1.000
107-13-1 Acrylonitrile 0.999
107-05-1 Allyl chloride 1.000
71-43-2 Benzene (includes benzene in gasoline) 1.000
98-07-7 Benzotrichloride (isomers and mixture) 0.958
100-44-7 Benzyl chloride 1.000
92-52-4 Biphenyl 0.864
542-88-1 Bis(chloromethyl)ether b 0.999
75-25-2 Bromoform 0.998
106-99-0 1,3-Butadiene 1.000
75-15-0 Carbon disulfide 1.000
56-23-5 Carbon tetrachloride 1.000
43-58-1 Carbonyl sulfide 1.000
133-90-4 Chloramben 0.633
108-90-7 Chlorobenzene 1.000
67-66-3 Chloroform 1.000
107-30-2 Chloromethyl methyl ether b 1.000
126-99-8 Chloroprene 1.000
98-82-8 Cumene 1.000
94-75-7 2,4-D, salts and esters 0.167
334-88-3 Diazomethane c 0.999
132-64-9 Dibenzofurans 0.967
96-12-8 1,2-Dibromo-3-chloropropane 1.000
106-46-7 1,4-Dichlorobenzene(p) 1.000
107-06-2 Dichloroethane (Ethylene dichloride) 1.000
111-44-4 Dichloroethyl ether (Bis(2-chloroethyl ether) 0.757
542-75-6 1,3-Dichloropropene 1.000
79-44-7 Dimethyl carbamoyl chloride c 0.150
64-67-5 Diethyl sulfate 0.0025
77-78-1 Dimethyl sulfate 0.086
121-69-7 N,N-Dimethylaniline 0.0008
51-28-5 2,4-Dinitrophenol 0.0077
121-14-2 2,4-Dinitrotoluene 0.0848
123-91-1 1,4-Dioxane (1,4-Diethyleneoxide) 0.869
106-89-8 Epichlorohydrin (1-Chloro-2,3-epoxypropane) 0.939
106-88-7 1,2-Epoxybutane 1.000
140-88-5 Ethyl acrylate 1.000
100-41-4 Ethyl benzene 1.000
75-00-3 Ethyl chloride (Chloroethane) 1.000
106-93-4 Ethylene dibromide (Dibromoethane) 0.999
107-06-2 Ethylene dichloride (1,2-Dichloroethane) 1.000
151-56-4 Ethylene imine (Aziridine) 0.867
75-21-8 Ethylene oxide 1.000
75-34-3 Ethylidene dichloride (1,1-Dichloroethane) 1.000
Glycol ethers d that have a Henry's Law constant value equal to or greater than 0.1 Y/X (1.8 × 10−6 atm/gm-mole/m3) at 25°C (e)
118-74-1 Hexachlorobenzene 0.97
87-68-3 Hexachlorobutadiene 0.88
67-72-1 Hexachloroethane 0.499
110-54-3 Hexane 1.000
78-59-1 Isophorone 0.506
58-89-9 Lindane (all isomers) 1.000
67-56-1 Methanol 0.855
74-83-9 Methyl bromide (Bromomethane) 1.000
74-87-3 Methyl chloride (Choromethane) 1.000
71-55-6 Methyl chloroform (1,1,1-Trichloroethane) 1.000
78-93-3 Methyl ethyl ketone (2-Butanone) 0.990
74-88-4 Methyl iodide (Iodomethane) 1.0001
108-10-1 Methyl isobutyl ketone (Hexone) 0.9796
624-83-9 Methyl isocyanate 1.000
80-62-6 Methyl methacrylate 0.916
1634-04-4 Methyl tert butyl ether 1.000
75-09-2 Methylene chloride (Dichloromethane) 1.000
91-20-3 Naphthalene 0.994
98-95-3 Nitrobenzene 0.394
79-46-9 2-Nitropropane 0.989
82-68-8 Pentachloronitrobenzene (Quintobenzene) 0.839
87-86-5 Pentachlorophenol 0.0898
75-44-5 Phosgene c 1.000
123-38-6 Propionaldehyde 0.999
78-87-5 Propylene dichloride (1,2-Dichloropropane) 1.000
75-56-9 Propylene oxide 1.000
75-55-8 1,2-Propylenimine (2-Methyl aziridine) 0.945
100-42-5 Styrene 1.000
96-09-3 Styrene oxide 0.830
79-34-5 1,1,2,2-Tetrachloroethane 0.999
127-18-4 Tetrachloroethylene (Perchloroethylene) 1.000
108-88-3 Toluene 1.000
95-53-4 o-Toluidine 0.152
120-82-1 1,2,4-Trichlorobenzene 1.000
71-55-6 1,1,1-Trichloroethane (Methyl chlorform) 1.000
79-00-5 1,1,2-Trichloroethane (Vinyl trichloride) 1.000
79-01-6 Trichloroethylene 1.000
95-95-4 2,4,5-Trichlorophenol 0.108
88-06-2 2,4,6-Trichlorophenol 0.132
121-44-8 Triethylamine 1.000
540-84-1 2,2,4-Trimethylpentane 1.000
108-05-4 Vinyl acetate 1.000
593-60-2 Vinyl bromide 1.000
75-01-4 Vinyl chloride 1.000
75-35-4 Vinylidene chloride (1,1-Dichloroethylene) 1.000
1330-20-7 Xylenes (isomers and mixture) 1.000
95-47-6 o-Xylenes 1.000
108-38-3 m-Xylenes 1.000
106-42-3 p-Xylenes 1.000
Notes:
fm 305 = Method 305 fraction measure factor.
a. CAS numbers refer to the Chemical Abstracts Services registry number assigned to specific compounds, isomers, or mixtures of compounds.
b. Denotes a HAP that hydrolyzes quickly in water, but the hydrolysis products are also HAP chemicals.
c. Denotes a HAP that may react violently with water, exercise caustic is an expected analyte.
d. Denotes a HAP that hydrolyzes slowly in water.
e. The fm 305 factors for some of the more common glycol ethers can be obtained by contacting the Waste and Chemical Processes Group, Office of Air Quality Planning and Standards, Research Triangle Park, NC 27711.

Where this section sits in the code

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 DD—National Emission Standards for Hazardous Air Pollutants from Off-Site Waste and Recovery Operations

CAS No. a Chemical name fm 305

75-07-0 Acetaldehyde 1.000

75-05-8 Acetonitrile 0.989

98-86-2 Acetophenone 0.314

107-02-8 Acrolein 1.000

107-13-1 Acrylonitrile 0.999

107-05-1 Allyl chloride 1.000

71-43-2 Benzene (includes benzene in gasoline) 1.000

98-07-7 Benzotrichloride (isomers and mixture) 0.958

100-44-7 Benzyl chloride 1.000

92-52-4 Biphenyl 0.864

542-88-1 Bis(chloromethyl)ether b 0.999

75-25-2 Bromoform 0.998

106-99-0 1,3-Butadiene 1.000

75-15-0 Carbon disulfide 1.000

56-23-5 Carbon tetrachloride 1.000

43-58-1 Carbonyl sulfide 1.000

133-90-4 Chloramben 0.633

108-90-7 Chlorobenzene 1.000

67-66-3 Chloroform 1.000

107-30-2 Chloromethyl methyl ether b 1.000

126-99-8 Chloroprene 1.000

98-82-8 Cumene 1.000

94-75-7 2,4-D, salts and esters 0.167

334-88-3 Diazomethane c 0.999

132-64-9 Dibenzofurans 0.967

96-12-8 1,2-Dibromo-3-chloropropane 1.000

106-46-7 1,4-Dichlorobenzene(p) 1.000

107-06-2 Dichloroethane (Ethylene dichloride) 1.000

111-44-4 Dichloroethyl ether (Bis(2-chloroethyl ether) 0.757

542-75-6 1,3-Dichloropropene 1.000

79-44-7 Dimethyl carbamoyl chloride c 0.150

64-67-5 Diethyl sulfate 0.0025

77-78-1 Dimethyl sulfate 0.086

121-69-7 N,N-Dimethylaniline 0.0008

51-28-5 2,4-Dinitrophenol 0.0077

121-14-2 2,4-Dinitrotoluene 0.0848

123-91-1 1,4-Dioxane (1,4-Diethyleneoxide) 0.869

106-89-8 Epichlorohydrin (1-Chloro-2,3-epoxypropane) 0.939

106-88-7 1,2-Epoxybutane 1.000

140-88-5 Ethyl acrylate 1.000

100-41-4 Ethyl benzene 1.000

75-00-3 Ethyl chloride (Chloroethane) 1.000

106-93-4 Ethylene dibromide (Dibromoethane) 0.999

107-06-2 Ethylene dichloride (1,2-Dichloroethane) 1.000

151-56-4 Ethylene imine (Aziridine) 0.867

75-21-8 Ethylene oxide 1.000

75-34-3 Ethylidene dichloride (1,1-Dichloroethane) 1.000

Glycol ethers d that have a Henry's Law constant value equal to or greater than 0.1 Y/X (1.8 × 10−6 atm/gm-mole/m3) at 25°C (e)

118-74-1 Hexachlorobenzene 0.97

87-68-3 Hexachlorobutadiene 0.88

67-72-1 Hexachloroethane 0.499

110-54-3 Hexane 1.000

78-59-1 Isophorone 0.506

58-89-9 Lindane (all isomers) 1.000

67-56-1 Methanol 0.855

74-83-9 Methyl bromide (Bromomethane) 1.000

74-87-3 Methyl chloride (Choromethane) 1.000

71-55-6 Methyl chloroform (1,1,1-Trichloroethane) 1.000

78-93-3 Methyl ethyl ketone (2-Butanone) 0.990

74-88-4 Methyl iodide (Iodomethane) 1.0001

108-10-1 Methyl isobutyl ketone (Hexone) 0.9796

624-83-9 Methyl isocyanate 1.000

80-62-6 Methyl methacrylate 0.916

1634-04-4 Methyl tert butyl ether 1.000

75-09-2 Methylene chloride (Dichloromethane) 1.000

91-20-3 Naphthalene 0.994

98-95-3 Nitrobenzene 0.394

79-46-9 2-Nitropropane 0.989

82-68-8 Pentachloronitrobenzene (Quintobenzene) 0.839

87-86-5 Pentachlorophenol 0.0898

75-44-5 Phosgene c 1.000

123-38-6 Propionaldehyde 0.999

78-87-5 Propylene dichloride (1,2-Dichloropropane) 1.000

75-56-9 Propylene oxide 1.000

75-55-8 1,2-Propylenimine (2-Methyl aziridine) 0.945

100-42-5 Styrene 1.000

96-09-3 Styrene oxide 0.830

79-34-5 1,1,2,2-Tetrachloroethane 0.999

127-18-4 Tetrachloroethylene (Perchloroethylene) 1.000

108-88-3 Toluene 1.000

95-53-4 o-Toluidine 0.152

120-82-1 1,2,4-Trichlorobenzene 1.000

71-55-6 1,1,1-Trichloroethane (Methyl chlorform) 1.000

79-00-5 1,1,2-Trichloroethane (Vinyl trichloride) 1.000

79-01-6 Trichloroethylene 1.000

95-95-4 2,4,5-Trichlorophenol 0.108

88-06-2 2,4,6-Trichlorophenol 0.132

121-44-8 Triethylamine 1.000

540-84-1 2,2,4-Trimethylpentane 1.000

108-05-4 Vinyl acetate 1.000

593-60-2 Vinyl bromide 1.000

75-01-4 Vinyl chloride 1.000

75-35-4 Vinylidene chloride (1,1-Dichloroethylene) 1.000

1330-20-7 Xylenes (isomers and mixture) 1.000

95-47-6 o-Xylenes 1.000

108-38-3 m-Xylenes 1.000

106-42-3 p-Xylenes 1.000

Notes:

fm 305 = Method 305 fraction measure factor.

a. CAS numbers refer to the Chemical Abstracts Services registry number assigned to specific compounds, isomers, or mixtures of compounds.

b. Denotes a HAP that hydrolyzes quickly in water, but the hydrolysis products are also HAP chemicals.

c. Denotes a HAP that may react violently with water, exercise caustic is an expected analyte.

d. Denotes a HAP that hydrolyzes slowly in water.

e. The fm 305 factors for some of the more common glycol ethers can be obtained by contacting the Waste and Chemical Processes Group, Office of Air Quality Planning and Standards, Research Triangle Park, NC 27711.

Collected 2026-08-27T02:26:04Z. Source file · JSON

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