Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 120 - Air Resources › Subchapter 05 - Air Pollution Control › Part 9 - Air Pollution Control Permits (250-RICR-120-05-9) › Section 250-RICR-120-05-9.17 - Appendix A: Minimum Quantities (pounds per year) and List of Federal Hazardous Air Pollutants (HAPs)

Current through June 14, 2024
CHEMICAL NAME
CAS #
Federal
HAP?
i
Minimum Quantity
Acetaldehyde
75070
Y
50
Acetamide
60355
Y
5
Acetone
67641
N
20,000
Acetonitrile
75058
Y
200
Acetophenone
98862
Y
900
2-Acetylaminofluorene
53963
Y
0.09
Acrolein
107028
Y
0.07
Acrylamide
79061
Y
0.09
Acrylic acid
79107
Y
3
Acrylonitrile
107131
Y
1
Aldrin
309002
N
0.002
Allyl chloride
107051
Y
3
2-Aminoanthraquinone
117793
N
10
4-Aminobiphenyl
92671
Y
0.02
Ammonia
7664417
N
300
Aniline
62533
Y
3
o-Anisidine
90040
Y
2
Antimony &
								compoundsa, including antimony trioxide
Y
0.6
Aramite
140578
N
10
Arsenic & compoundsa
								(inorganic)
Y
0.02
Arsine
7784421
Y
0.2
Asbestos
1332214
Y
400b
Azobenzene
103333
N
3
Barium
7440393
N
2000
Benzene
71432
Y
10
Benzidine
92875
Y
0.002
Benzoic acid
65850
N
30,000
Benzotrichloride
98077
Y
0.03
Benzyl chloride
100447
Y
2
Beryllium &
								compoundsa
Y
0.04
Biphenyl
92524
Y
600
Bis (chloromethyl) ether
542881
Y
0.002
Bis (2-ethylhexyl) phthalate (DEHP)
117817
Y
40
Boron and borates
N
4
Bromates (including Potassium bromate)
N
0.8
Bromine and compoundsm
								(except Hydrogen bromide & Bromates)
N
200
Bromodichloromethane
75274
N
3
Bromoform
75252
Y
100
1,3-Butadiene
106990
Y
3
Butyl benzyl phthalate
85687
N
2,000
Cadmium &
								compoundsa
Y
0.07
Calcium cyanamide
156627
Y
100
Captan
133062
Y
100
Carbaryl
63252
Y
900
Carbon disulfide
75150
Y
2,000
Carbon tetrachloride
56235
Y
8
Carbonyl sulfide
463581
Y
70
Catechol
120809
Y
500
Chloramben
133904
Y
200
Chlordane
57749
Y
0.1
Chlorinated paraffins (avg length C12- C13, 60%
								chlorine)
108171262
N
4
Chlorine
7782505
Y
10
Chlorine dioxide
10049044
N
9
Chloroacetic acid
79118
Y
10
2-Chloroacetophenone
532274
Y
0.09
4-Chloroaniline
106478
N
30
Chlorobenzene
108907
Y
20,000
Chlorobenzilate
510156
Y
80
1-Chloro-1,1-difluoroethane (CFC 142B)
75683
N
36,500
Chlorodifluoromethane (HCFC-22)
75456
N
36,500
Chloroform
67663
Y
20
Chloromethyl methyl ether
107302
Y
0.1
2-Chlorophenol
95578
N
60
4-Chloro-o-phenylenediamine
95830
N
20
Chloropicrin
76062
N
10
Chloroprene
126998
Y
100
p-chloro-o-toluidine
95692
N
1
Chromium III &
								compoundsa, insoluble salts
Y
20,000
Chromium VI &
								compoundsa
Y
0.009
Cobalt &
								compoundsa
Y
0.1
Coke oven emissions
8007452
Y
0.2
Copper & compoundsa,
								except Copper cyanide
N
40
p-Cresidine
120718
N
2
Cresols/Cresylic acid isomers and mixtures
								(Methylphenols)
1319773
Y
20,000
Cumene
98828
Y
1,000
Cupferron
135206
N
2
Cyanide & compounds (inorganic)j
								  m, except Hydrogen cyanide
Y
100
Cyclohexane
110827
N
20,000
2,4-Diaminoanisole
615054
N
20
2,4-Diaminotoluene
95807
N
0.1
Diazomethane
334883
Y
90
Dibromochloromethane
124481
N
100
1,2-Dibromo-3-chloropropane
96128
Y
0.05
Dibutylphthalate
84742
Y
700
1,2-Dichlorobenzene
95501
N
700
1,4-Dichlorobenzene (p-Dichlorobenzene)
106467
Y
10
3,3'-Dichlorobenzidene
91941
Y
0.3
Dichloro diphenyl dichloroethylene (DDE)
3547044
Y
1
cis- 1,2-Dichloroethene
156592
N
1,000
trans- 1,2-Dichloroethene
156605
N
300
Dichloroethyl ether (Bis (chloroethyl)
								ether)
111444
Y
0.3
2,4-Dichlorophenoxyacetic acid, salts & esters
								(2,4-D)
94757
Y
90
1,3-Dichloropropene
542756
Y
20
Dichlorvos
62737
Y
1
Dieldrin
60571
N
0.02
Diethanolamine
111422
Y
300
Diethyl sulfate
64675
Y
0.3
1,1-Difluoroethane (HCFC 152a)
75376
N
36,500
3,3'-Dimethoxybenzidine
119904
Y
0.09
p-Dimethyl aminoazobenzene
60177
Y
0.09
n,n-Dimethyl aniline
121697
Y
20
3,3'-Dimethyl benzidine
119937
Y
0.002
Dimethyl carbamoyl chloride
79447
Y
0.03
Dimethyl formamide
68122
Y
3,000
1,1-Dimethyl hydrazine
57147
Y
0.1
1,2-Dimethyl hydrazine
540738
N
0.0007
2,4-Dimethylphenol
105679
N
200
Dimethyl phthalate
131113
Y
1,000
Dimethyl sulfate
77781
Y
0.02
4,6-Dinitro-o-cresol
534521
Y
4
2,4-Dinitrophenol
51285
Y
10
2,4-Dinitrotoluene
121142
Y
1
1,4-Dioxane (1,4-Diethyleneoxide)
123911
Y
10
1,2-Diphenylhydrazine (Hydrazobenzene)
122667
Y
0.5
Epichlorohydrin
106898
Y
90
1,2-Epoxybutane
106887
Y
200
Ethyl acrylate
140885
Y
50
Ethyl benzene
100414
Y
9,000
Ethyl carbamate (Urethane)
51796
Y
0.3
Ethyl chloride (Chloroethane)
75003
Y
10,000
Ethylene dibromide (Dibromoethane)
106934
Y
0.2
Ethylene dichloride (1,2-Dichloroethane)
107062
Y
4
Ethylene glycol
107211
Y
700
Ethylene glycol monobutyl ether
111762
N
4,000
Ethylene glycol monoethyl ether
110805
Y
100
Ethylene glycol monoethyl ether acetate
111159
Y
40
Ethylene glycol monomethyl ether
109864
Y
30
Ethylene glycol monomethyl ether acetate
110496
Y
10,000
Ethylene imine (Aziridine)
151564
Y
0.005
Ethylene oxide
75218
Y
1
Ethylene thiourea
96457
Y
9
Ethylidene dichloride (1,1-Dichloroethane)
75343
Y
70
Fluorides &
								compoundsm, including Hydrogen fluoride
Y
7
Formaldehyde
50000
Y
9
Glutaraldehyde
111308
N
9
Glycol ethers, totalk
								(see also Minimum Quantities for individual glycol ethers)
Y
20,000
Heptachlor
76448
Y
0.009
Hexachlorobenzene
118741
Y
0.02
Hexachlorobutadiene
87683
Y
2
Hexachlorocyclohexanes, technical grade & mixed
								isomers
608731
Y
0.2
alpha-Hexachlorocyclohexane
319846
Y
0.07
beta-Hexachlorocyclohexane
319857
Y
0.2
gamma-Hexachlorocyclohexane (Lindane)
58899
Y
0.1
Hexachlorocyclopentadiene
77474
Y
20
Hexachloroethane
67721
Y
30
Hexamethylene-1,6-diisocyanate
822060
Y
0.6
Hexamethylphosphoramide
680319
Y
0.005
Hexane
110543
Y
20,000
Hydrazine
302012
Y
0.02
Hydrochloric acid (Hydrogen chloride)
7647010
Y
700
Hydrogen bromide
10035106
N
2,000
Hydrogen cyanide
74908
Y
100
Hydrogen sulfide
7783064
N
10
Hydroquinone
123319
Y
500
Isophorone
78591
Y
2,000
Isopropanol
67630
N
1,000
Lead & compoundsa,
								inorganic
Y
0.9
Lead - tetraethyl lead
78002
Y
9.E- 04
Maleic anhydride
108316
Y
4
Manganese &
								compoundsa
Y
0.2
Mercury & compoundsa
								- elemental & inorganic
Y
0.7
Mercury - Methyl mercury
22967926
Y
0. 3
Methanol
67561
Y
10,000
Methoxychlor
72435
Y
60
Methyl bromide (Bromomethane)
74839
Y
70
Methyl chloride (Chloromethane)
74873
Y
400
Methyl chloroform (1,1,1-Trichloroethane)
71556
Y
3,000
4,4-Methylene bis (2-chloroaniline)
101144
Y
0.2
Methylene chloride (Dichloromethane)
75092
Y
200
4,4-Methylenedianiline
101779
Y
0.2
Methylene diphenyl diisocyanate
101688
Y
70
Methyl ethyl ketone (2-Butanone)
78933
N
4,000
Methyl hydrazine
60344
Y
0.04
Methyl iodide (Iodomethane)
74884
Y
3,000
Methyl isobutyl ketone (Hexanone)
108101
Y
9,000
Methyl isocyanate
624839
Y
100
Methyl methacrylate
80626
Y
2,000
Methyl tert butyl ether (MTBE)
1634044
Y
3,000
Michler's ketone (4,4'-Bis (dimethylamino)
								benzophenone)
90948
N
0.4
Fine mineral
								fibersc
Y
2,000
Molybdenum and
								compoundsa
N
60
Naphthalene
91203
Y
3
Nickel and compoundsa,
								except Nickel subsulfide
Y
0.4
Nickel subsulfide
12035722
Y
0.2
Nitric acid
7697372
N
30
Nitrobenzene
98953
Y
200
4-Nitrobiphenyl
92933
Y
0.002
4-Nitrophenol
100027
Y
10
2-Nitropropane
79469
Y
10
N-Nitrosodi-n-butylamine
924163
N
0.07
N-Nitrosodiethylamine
55185
N
0.002
N-Nitrosodimethylamine
62759
Y
0.008
N-Nitrosodiphenylamine
86306
N
40
N-Nitrosdi-n-propylamine
621647
N
0.05
N-Nitroso-n-methylethylamine
10595956
N
0.02
N-Nitroso-n-methylurea
684935
Y
0.003
N-Nitrosomorpholine
59892
Y
0.05
N-Nitrosopiperidine
100754
N
0.04
N-Nitrosopyrrolidine
930552
N
0.2
Parathion
56382
Y
10
Pentachloronitrobenzene (Quintozene)
82688
Y
30
Pentachlorophenol
87865
Y
7
Phenol
108952
Y
30
p-Phenylenediamine
106503
Y
20
Phosgene
75445
Y
0.9
Phosphine
7803512
Y
30
Phosphoric acid
7664382
N
800
Phosphorus, white
7723140
Y
0.2
Phthalic anhydride
85449
Y
2,000
Polychlorinated biphenyls (PCBs), except Aroclor
								1254
1336363
Y
0.1
PCBs- Aroclor 1254
11097691
Y
0. 2
Polychlorinated dibenzo dioxins (PCDDs),
								polychlorinated dibenzo furans (PCDFs) and dioxin-like polychlorinated
								biphenyls (PCBs)
Y
3 X 10-7d
Polycyclic Organic Matter
Y
0.01e
1,3-Propane sultone
1120714
Y
0.1
beta-Propiolactone
57578
Y
0.02
Propionaldehyde
123386
Y
20
Propoxur (Baygon)
114261
Y
10
n-Propyl bromide (1-Bromopropane)
106945
N
10,000
Propylene
115071
N
36,500
Propylene dichloride (1,2-Dichloropropane)
78875
Y
10
Propylene glycol monomethyl ether (PGME)
107982
N
36,500
Propylene oxide
75569
Y
30
1,2-Propylenimine (2-Methyl aziridine)
75558
Y
0.01
Quinoline
91225
Y
0.1
Quinone
106514
Y
100
Radionuclidesl
Y
20,000
Selenium &
								compoundsa except Hydrogen selenide and Selenium
								sulfide
Y
2,000
Selenium - Hydrogen selenide
7783075
Y
2
Selenium sulfide
7446346
Y
20
Sodium hydroxide
1310732
N
3
Styrene
100425
Y
3,000
Styrene oxide
96093
Y
2
Sulfatesf
N
40
Sulfuric acid and
								Oleumg
N
40
1,1,1,2-Tetrachloroethane
630206
N
300
1,1,2,2-Tetrachloroethane
79345
Y
6,000
Tetrachloroethylene (Perchloroethylene)
127184
Y
20
Tetrachlorophenols
25167833
N
10,000
1,1,1,2-Tetrafluoroethane
811972
N
36,500
Thioacetamide
62555
N
0.07
Titanium tetrachloride
7550450
Y
10
Toluene
108883
Y
1,000
2,4-Toluene diamine (2,4-Diaminotoluene)
95807
Y
0.1
2,4-and 2,6-Toluene
								diisocyanateh
26471625
Y
8
o-Toluidine
95534
Y
2
Toxaphene (Chlorinated camphene)
8001352
Y
0.03
1,2,4-Trichlorobenzene
120821
Y
90
1,1,2-Trichloroethane
79005
Y
30
Trichloroethylene
79016
Y
50
Trichlorofluoromethane
75694
N
3,000
2,4,5-Trichlorophenol
95954
Y
900
2,4,6-Trichlorophenol
88062
Y
30
Triethylamine
121448
Y
800
Trifluralin
1582098
Y
90
2,2,4-Trimethylpentane
540841
Y
20,000
Vanadium and
								compoundsa
N
0.07
Vinyl acetate
108054
Y
600
Vinyl bromide
593602
Y
0.5
Vinyl chloride
75014
Y
20
Vinylidene chloride (1,1-Dichloroethylene)
75354
Y
600
Xylenes, isomers and mixtures
1330207
Y
3,000
Zinc and
								compoundsa
N
3,000
aFor metal compounds,
								Minimum Quantities apply to the metal portion of the compound.
bAsbestos units are
								fibers/year.
cFine mineral fibers are
								mineral fiber emissions from facilities manufacturing or processing glass,
								rock, or slag fibers or other mineral derived fibers of average diameter 1
								micrometer (µm) or less.
dPCDD Minimum Quantity
								is in terms of 2,3,7,8-tetrachlorodibenzodioxin equivalents, calculated as
								specified in the Rhode Island Air Toxics Guideline.
ePolycyclic Organic
								Matter Minimum Quantity is in terms of benzo(a)pyrene equivalents, calculated
								as specified in the Rhode Island Air Toxics Guideline.
fSulfates MQ applies to
								ammonium bisulfate [(NH4)HSO4,
								CAS 7803-63-6], ammonium sulfate
								[(NH4)2SO4,
								CAS 7783-20-2], ferric sulfate
								[Fe(SO4)3, CAS 10028-22-5] and
								sodium sulfate [Na2SO4, CAS
								7757-82-6]
gSulfuric acid and oleum
								MQ applies to sulfuric acid
								(H2SO4, CAS 7664-03-9), sulfur
								trioxide (SO3, CAS 7446-71-9) and oleum
								(H2SO4 +
								SO3, CAS 8014-95-7)
hIncludes 2,4-TDI (CAS
								584849), 2,6-TDI (CAS 91087) and 2,4/2,6 mixtures (CAS 26471625)
iA "Y" in this column
								indicates that the substance is a Federal Hazardous Air Pollutant (HAP).
								Substances marked "N" are not Federal HAPs.
jXCN where X equals any
								group other than H where a formal dissociation may occur, such as KCN or
								Ca(Cn)2.
k Includes mono- and di-
								ethers of ethylene glycol, diethylene glycol, and triethylene glycol
								R-(OCH2CH2)n-OR' where
n = 1, 2, or 3
R = alkyl or aryl groups
R' = R, H, or groups which, when removed, yield
								glycol ethers with the structure: R-(OCH2CH)n-OH. Polymers are excluded from
								the glycol category.
lA type of atom which
								spontaneously undergoes radioactive decay.
m For bromine, cyanide
								and fluoride compounds, MQs apply to the bromine, cyanide or fluoride portion
								of the compound
Note: For all listings in the above table which
								contain the word "compounds" and for glycol ethers, the following applies:
								Unless otherwise specified, these listings are defined as including any unique
								chemical substance that contains the named chemical (i.e., antimony, arsenic,
								etc.) as part of that chemical's infrastructure.