Twenty-four properly functioning and
six high carbonmonoxide emi
ssion light-duty ga
soline vehicle
s were emi
ssionte
sted in Denver, CO, u
sing the Federal Te
st Procedure(FTP), a hot
start Unified Cycle (UC), and the REP05 drivingcycle
s at 35
s/entitie
s/deg.gif">F. All were 1990-1997 model year vehicle
ste
sted on both an oxygenated and a nonoxygenated fuel.PM
10 emi
ssion rate
s for the properly functioning vehicle
su
sing oxygenated fuel averaged 6.1, 3.6, and 12.7 mg/mifor the FTP, UC, and REP05, re
spectively. The corre
spondingvalue
s for the high emitter
s were 52, 28, and 24 mg/mi.U
se of oxygenated fuel
significantly reduce
s PM
10 on theFTP, with all the reduction occurring during the cold
start. MOUDI impactor
sample
s showed that 33 and 69%of the PM ma
ss wa
s smaller than 0.1
s/entitie
s/mgr.gif">m for the FTP andREP05 cycle
s, re
spectively, when collected under
standardlaboratory condition
s. Particle number count
s weremuch higher on the REP05 than the FTP. Count
s wereobtained u
sing
secondary dilution of
sample
s drawn fromthe
standard dilution tunnel. FTP PM
10 wa
s mo
stlycarbonaceou
s material, 36% of which wa
s cla
ssified a
sorganic. For the REP05, a
s much a
s 20% of the PM
10 wa
ssulfate and a
ssociated water. Forty-five percent of theREP05 PM carbon emi
ssion
s wa
s cla
ssified a
s organic.Driving cycle had a
significant impact on the di
stributionof the emitted polynuclear aromatic hydrocarbon
s.