Real-time measurements of nitrogen oxide emissions from in-use New York City transit buses using a chase vehicle.
New diesel engine technologies and alternative fuel engines are being introduced into fleets of mass transit buses to try to meet stricter emission regulations of nitrogen oxides and particulates: Real-time instruments including an Aerodyne Research tunable infrared laser differential absorption spectrometer (TILDAS) were deployed in a mobile laboratory to assess the impact of the implementation of the new technologies on nitrogen oxide emissions in real world driving conditions. Using a "chase" vehicle sampling strategy, the mobile laboratory followed target vehicles, repeatedly sampling their exhaust. Nitrogen oxides from approximately 170 in-use New York City mass transit buses were sampled during the field campaigns. Emissions from conventional diesel buses, diesel buses with continuously regenerating technology (CRT), diesel hybrid electric buses, and compressed natural gas (CNG) buses were compared. The chase vehicle sampling method yields real world emissions that can be included in more realistic emission inventories. The NO, emissions from the diesel and CNG buses were comparable. The hybrid electric buses had approximately one-half the NOx emissions. In CRT diesels, NO2 accounts for about one-third of the NOx emitted in the exhaust, while for non-CRT buses the NO2 fraction is less than 10%.
Shorter
Joanne H
JH
Center for Atmospheric and Environmental Chemistry, Aerodyne Research, Inc., 45 Manning Road, Billerica, Massachusetts 01821, USA. shorter@aerodyne.com
Herndon
Scott
S
Zahniser
Mark S
MS
Nelson
David D
DD
Wormhoudt
Joda
J
Demerjian
Kenneth L
KL
Kolb
Charles E
CE
D005579:Fossil Fuels; D018986:Motor Vehicles; D009519:New York City; D009589:Nitrogen Oxides / Q000032:analysis*; D013057:Spectrum Analysis; D013997:Time Factors; D001335:Vehicle Emissions / Q000032:analysis*
D005579:Fossil Fuels; D009589:Nitrogen Oxides; D001335:Vehicle Emissions