Document Detail


A new screening measure to identify potential carbon monoxide hotspots.
MedLine Citation:
PMID:  10680355     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To demonstrate conformity of transportation projects to National Ambient Air Quality Standards in accordance with State Implementation Plans, the U.S. Environmental Protection Agency (EPA) uses intersection level of service (LOS) as one of its major criteria for screening for potential carbon monoxide (CO) hotspots. Although intersection LOS is a measure of traffic volume, signal timing, and related congestion and delay, the assigned level reflects only the computed averaged stopped delay (ASD) per vehicle at the intersection. Thus, intersections can often operate at the same LOS but produce vastly different levels of predicted CO concentrations. For example, a two-lane approach operating at LOS D will produce very different levels of CO than a five-lane approach also operating at LOS D. This study explores the effectiveness of the LOS D criterion as a screen for identifying potential CO hotspots. The study results indicate that LOS is a poor predictor of potential CO hotspots when compared to results generated with the EPA-recommended micro-scale model CAL3QHCr. To more consistently screen out those intersections that will not be identified as CO hotspots using the micro-scale models, a new criterion, equivalent red-time vehicles (ERTV), is introduced. The modeling results using ERTV suggest that it is a more robust measure for identifying potential CO hotspots, and conversely, screening out those intersections that are not likely to be identified as hotspots using micro-scale simulation results.
Authors:
Y Meng; D A Niemeier
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of the Air & Waste Management Association (1995)     Volume:  50     ISSN:  1096-2247     ISO Abbreviation:  J Air Waste Manag Assoc     Publication Date:  2000 Feb 
Date Detail:
Created Date:  2000-03-16     Completed Date:  2000-03-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9503111     Medline TA:  J Air Waste Manag Assoc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  252-8     Citation Subset:  IM    
Affiliation:
University of California, Davis, USA.
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MeSH Terms
Descriptor/Qualifier:
Air Pollutants, Occupational / analysis*
Carbon Monoxide / analysis*
Vehicle Emissions / analysis*
Chemical
Reg. No./Substance:
0/Air Pollutants, Occupational; 0/Vehicle Emissions; 630-08-0/Carbon Monoxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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