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Clean Air Solvent Certification Protocol Appendix V Maximum Incremental Reactivity

September 2003

NMOG Constituent

Maximum Incremental Reactivity (g O3/g NMOG)

1,3-Butadiene

7.7

1,3,5-Trimethyl Benzene

7.5

1,2,3-Trimethyl Benzene

7.4

1,2,4-Trimethyl Benzene

7.4

cis-2-Butene

7.3

trans-2-Butene

7.3

C10 Trialkyl Benzenes

6.7

Propene

6.6

Isoprene

6.5

C5 Internal Alkenes

6.2

Formaldehyde

6.2

1-Butene

6.1

C11 Trialkyl Benzenes

6.1

m-Xylene

6.0

C12 Trialkyl Benzenes

5.6

C6 Internal Alkenes

5.3

C9 Dialkyl benzenes

5.3

Ethene

5.3

o-Xylene

5.2

p-Xylene

5.2

2-Methyl-2-Butene

5.0

C10 Dialkyl benzenes

4.8

Propionaldehyde

4.6

C7 Internal Alkenes

4.4

C11 Dialkyl benzenes

4.3

1-Pentene

4.2

3-Methyl-1-Butene

4.2

Isobutene

4.2

Cyclopentene

4.0

C12 Dialkyl benzenes

3.9

Acetaldehyde

3.8

2-Methyl-1-Butene

3.7

2,3-Dimethyl-2-Butene

3.7

2,3-Dimethyl Naphthalene

3.7

C8 Internal Alkenes

3.6

Cyclohexene

3.3

C9 Internal Alkenes

3.2

1-Hexene

3.0

C6 Terminal Alkenes

3.0

C10 Internal Alkenes

2.8

C11 Internal Alkenes

2.5

C7 Terminal Alkenes

2.4

Methyl Naphthalene

2.4

C12 Internal Alkenes

2.3

C13 Internal Alkenes

2.1

C8 Terminal Alkenes

1.9

C14 Internal Alkenes

1.9

a-Pinene

1.9

b-Pinene

1.9

Toluene

1.9

C15 Internal Alkenes

1.8

Ethyl Benzene

1.8

Methylcyclopentane

1.7

Cyclopentane

1.6

C9 Cycloalkanes

1.6

C9 Terminal Alkenes

1.6

Cresols

1.6

n-Butyl Alcohol

1.6

Isopropyl Benzene

1.5

n-Propyl Benzene

1.44

C8 Cycloalkanes

1.36

Ethycyclohexane

1.36

Ethyl t-Butyl Ether

1.33

n-Propyl Alcohol

1.33

C10 Terminal Alkenes

1.32

C10 Cycloalkanes

1.31

n-Butyl Benzene

1.29

C10 Monoalkyl Benzenes

1.28

C11 Cycloalkanes

1.23

C12 Cycloalkanes

1.20

C7 Cycloalkanes

1.17

Methylcyclohexane

1.17

C11 Monoalkyl Benzenes

1.16

C11 Terminal Alkenes

1.15

Ethylene Glycol

1.13

2,4-Dimethyl Pentane

1.07

C12 Monoalkyl Benzenes

1.06

C12 Terminal Alkenes

1.03

2,3-Dimethyl Pentane

0.96

3-Methylpentane

0.95

C13 Cycloalkanes

0.94

C13 Terminal Alkenes

0.93

Propylene Glycol

0.92

2-Methylpentane

0.91

Branched C6 Alkanes

0.91

Branched C5 Alkanes

0.88

C14 Cycloalkanes

0.88

Iso-Pentane

0.88

Naphthalene

0.87

C14 Terminal Alkenes

0.86

3-Methyl Hexane

0.85

4-Methyl Hexane

0.85

Branched C7 Alkanes

0.85

C15 Cycloalkanes

0.85

Isobutane

0.85

C6 Cycloalkanes

0.84

Cyclohexane

0.84

C15 Terminal Alkenes

0.80

Ethanol

0.79

Phenol

0.79

Lumped C4-C5 Alkanes

0.78

C4 Ketones

0.76

Branched C12 Alkanes

0.75

2,3-Dimethyl Butane

0.74

Tetralin

0.73

4-Methyl Heptane

0.72

Branched C8 Alkanes

0.72

Branched C11 Alkanes

0.72

Isobutyl Alcohol

0.72

Iso-Octane

0.70

Lumped C6+ Alkanes

0.70

Branched C9 Alkanes

0.68

4-Ethyl Heptane

0.68

n-Butane

0.64

n-Pentane

0.64

n-Hexane

0.61

4-Propyl Heptane

0.60

Branched C10 Alkanes

0.60

Branched C13 Alkanes

0.57

n-Heptane

0.48

Methyl t-Butyl Ether

0.47

Branched C14 Alkanes

0.44

n-Octane

0.41

2,2-Dimethyl Butane

0.41

Branched C15 Alkanes

0.41

Methanol

0.40

Acetone

0.39

Acetylene

0.37

Isopropyl Alcohol

0.37

Propane

0.33

n-Nonane

0.29

t-Butyl Alcohol

0.29

Benzene

0.28

n-Decane

0.25

n-Undecane

0.21

n-Dodecane

0.19

Neopentane

0.19

n-Tridecane

0.17

n-Tetradecane

0.16

Ethane

0.147

n-Pentadecane

0.144

Methane

0.0102

Benzaldehyde

-0.54

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Source: Appendix VIII of the ARB’s “California Exhaust Emission Standards and Test Procedures for 1988 and Subsequent Model Passenger Cars, Light-Duty Trucks and Medium-Duty Vehicles,” as amended on September 22, 1993

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