A Comparative Investigation of Ultrafine Particle Number and Mass Emissions from a Fleet of On-road Diesel and CNG Buses

Jayaratne, Rohan, Ristovski, Zoran, Morawska, Lidia, & Johnson, Graham R. (2008) A Comparative Investigation of Ultrafine Particle Number and Mass Emissions from a Fleet of On-road Diesel and CNG Buses. Environmental Science and Technology, 42(17), pp. 6736-6742.

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Particle number, particle mass and CO2 concentrations were measured on the kerb of a busy urban busway used entirely by a mix of diesel and CNG operated buses. With the passage of each bus, the ratio of particle number concentration and particle mass concentration to CO2 concentration in the diluted exhaust plume were used as measures of the particle number and mass emission factors, respectively. With all buses accelerating past the monitoring point, the results showed that the median particle mass emission from CNG buses was less than 9% of that from diesel buses. However, the median particle number emission from CNG buses was six times higher than the diesel buses and the particles from the CNG buses were mainly in the nanoparticle size range. Using a thermodenuder to remove the volatile material from the sampled emissions showed that the majority of particles from the CNG buses, but not from the diesel buses, were volatile. Approximately, 82% of the particles from the CNG buses and 38% from the diesel buses were removed by heating the emissions to 300°C.

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18 citations in Web of Science®
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ID Code: 15398
Item Type: Journal Article
Refereed: Yes
Additional Information: This article is freely available from the American Chemical Society website 12 months after the publication date. See links to publisher website in this record.
Keywords: emission factor, particle number, nanoparticles, exhaust emissions, urban transport
DOI: 10.1021/es800394x
ISSN: 0013-936X
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > ATMOSPHERIC SCIENCES (040100) > Atmospheric Sciences not elsewhere classified (040199)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2008 American Chemical Society
Deposited On: 31 Oct 2008 00:00
Last Modified: 29 Feb 2012 13:50

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