Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 266, App. IV—Reference Air Concentrations a]

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