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Title: CNG and Diesel Transit Bus Emissions in Review

Abstract

Over the past three years, the California Air Resources Board (CARB), in collaboration with the University of California and other entities, has investigated the tailpipe emissions from three different latemodel, in-use heavy-duty transit buses in five different configurations. The study has focused on the measurement of regulated emissions (NOX, HC, CO, total PM), other gaseous emissions (CO2, NO2, CH4, NMHC), a number of pollutants of toxic risk significance (aromatics, carbonyls, PAHs, elements), composition (elemental and organic carbon), and the physical characterization (size-segregated number count and mass) of the particles in the exhaust aerosol. Emission samples are also tested in a modified Ames assay. The impact of oxidation catalyst control for both diesel and compressed natural gas (CNG) buses and a passive diesel particulate filter (DPF) were evaluated over multiple driving cycles (idle, 55 mph cruise, CBD, UDDS, NYBC) using a chassis dynamometer. For brevity, only CBD results are discussed in this paper and particle sizing results are omitted. The database of results is large and some findings have been reported already at various forums including last year's DEER conference. The goal of this paper is to offer an overview of the lessons learned and attempt to draw overall conclusions andmore » interpretations based on key findings to date.« less

Authors:
 [1];  [2];  [1];  [3];  [3]
  1. a
  2. a,b
  3. b
Publication Date:
Research Org.:
California Environmental Protection Agency, Air Resources Board Sacramento and El Monte, California (US); Department of Environmental Toxicology, University of California, Davis (US)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EE) (US)
OSTI Identifier:
829623
Report Number(s):
CONF-200308-112
TRN: US200428%%1067
Resource Type:
Conference
Resource Relation:
Conference: 9th Diesel Engine Emissions Reduction (DEER) Workshop 2003, Newport, RI (US), 08/24/2003--08/28/2003; Other Information: PBD: 24 Aug 2003
Country of Publication:
United States
Language:
English
Subject:
03 NATURAL GAS; 33 ADVANCED PROPULSION SYSTEMS; AROMATICS; BUSES; CARBON; CARBONYLS; CATALYSTS; DIESEL ENGINES; NATURAL GAS; OXIDATION; PARTICULATES; POLLUTANTS; SIZE

Citation Formats

Ayala, A, Kado, N, Okamoto, R, Gebel, M., Kobayashi, R, and Kuzmicky, P. CNG and Diesel Transit Bus Emissions in Review. United States: N. p., 2003. Web.
Ayala, A, Kado, N, Okamoto, R, Gebel, M., Kobayashi, R, & Kuzmicky, P. CNG and Diesel Transit Bus Emissions in Review. United States.
Ayala, A, Kado, N, Okamoto, R, Gebel, M., Kobayashi, R, and Kuzmicky, P. 2003. "CNG and Diesel Transit Bus Emissions in Review". United States. https://www.osti.gov/servlets/purl/829623.
@article{osti_829623,
title = {CNG and Diesel Transit Bus Emissions in Review},
author = {Ayala, A and Kado, N and Okamoto, R and Gebel, M. and Kobayashi, R and Kuzmicky, P},
abstractNote = {Over the past three years, the California Air Resources Board (CARB), in collaboration with the University of California and other entities, has investigated the tailpipe emissions from three different latemodel, in-use heavy-duty transit buses in five different configurations. The study has focused on the measurement of regulated emissions (NOX, HC, CO, total PM), other gaseous emissions (CO2, NO2, CH4, NMHC), a number of pollutants of toxic risk significance (aromatics, carbonyls, PAHs, elements), composition (elemental and organic carbon), and the physical characterization (size-segregated number count and mass) of the particles in the exhaust aerosol. Emission samples are also tested in a modified Ames assay. The impact of oxidation catalyst control for both diesel and compressed natural gas (CNG) buses and a passive diesel particulate filter (DPF) were evaluated over multiple driving cycles (idle, 55 mph cruise, CBD, UDDS, NYBC) using a chassis dynamometer. For brevity, only CBD results are discussed in this paper and particle sizing results are omitted. The database of results is large and some findings have been reported already at various forums including last year's DEER conference. The goal of this paper is to offer an overview of the lessons learned and attempt to draw overall conclusions and interpretations based on key findings to date.},
doi = {},
url = {https://www.osti.gov/biblio/829623}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Aug 24 00:00:00 EDT 2003},
month = {Sun Aug 24 00:00:00 EDT 2003}
}

Conference:
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