September 2003
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