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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
7
|
| pubmed:dateCreated |
1998-9-10
|
| pubmed:abstractText |
In August 1995, measurements of CO, NO(x') speciated nonmethane hydrocarbons (NMHC), and CO2 were made in Vancouver's Cassiar Connector, a 730-m-long level-grade highway traffic tunnel. Two characteristics of the Vancouver setting are the presence of many propane vehicles and a mandatory inspection and maintenance (I/M) program. Although the driving conditions and vehicle fleets are otherwise outwardly similar to those of recent Tuscarora-tunnel studies, CO/NO(x) ratios at the Cassiar Connector are significantly lower than those measured at Tuscarora. The Cassiar measurements are consistent with the MOBILE5A mobile emissions model predictions. The Canadian version of MOBILE5A--known as MOBILE5C--gives nearly identical results, indicating that differences in Canadian and U.S. emission standards cannot explain differences between Cassiar and U.S. tunnels. Considering the modeling results as well as measured ethene/acetylene ratios indicative of noncatalyst vehicles, it appears that vehicle deterioration remains the major issue in in-use vehicle emissions--even in Vancouver, where there is a mandatory loaded-mode I/M program. Uncertainties in determining the ages of the vehicles in the tunnel, however, have a significant impact on the model predictions.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:chemical | |
| pubmed:status |
MEDLINE
|
| pubmed:month |
Jul
|
| pubmed:issn |
1096-2247
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
48
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
604-15
|
| pubmed:dateRevised |
2006-11-15
|
| pubmed:meshHeading | |
| pubmed:year |
1998
|
| pubmed:articleTitle |
Gaseous emissions from vehicles in a traffic tunnel in Vancouver, British Columbia.
|
| pubmed:affiliation |
Department of Mechanical Engineering, University of British Columbia, Vancouver, Canada.
|
| pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
|