Document Detail

Modeling of personal exposures to ambient air toxics in Camden, New Jersey: an evaluation study.
MedLine Citation:
PMID:  19603741     Owner:  NLM     Status:  MEDLINE    
This study presents the Individual Based Exposure Modeling (IBEM) application of MENTOR (Modeling ENvironment for TOtal Risk studies) in a hot spot area, where there are concentrated local sources on the scale of tens to hundreds of meters, and an urban reference area in Camden, NJ, to characterize the ambient concentrations and personal exposures to benzene and toluene from local ambient sources. The emission-based ambient concentrations in the two neighborhoods were first estimated through atmospheric dispersion modeling. Subsequently, the calculated and measured ambient concentrations of benzene and toluene were separately combined with the time-activity diaries completed by the subjects as inputs to MENTOR/IBEM for estimating personal exposures resulting from ambient sources. The modeling results were then compared with the actual personal measurements collected from over 100 individuals in the field study to identify the gaps in modeling personal exposures in a hot spot. The modeled ambient concentrations of benzene and toluene were generally in agreement with the neighborhood measurements within a factor of 2, but were underestimated at the high-end percentiles. The major local contributors to the benzene ambient levels are from mobile sources, whereas mobile and stationary (point and area) sources contribute to the toluene ambient levels in the study area. This finding can be used as guidance for developing better air toxic emission inventories for characterizing, through modeling, the ambient concentrations of air toxics in the study area. The estimated percentage contributions of personal exposures from ambient sources were generally higher in the hot spot area than the urban reference area in Camden, NJ, for benzene and toluene. This finding demonstrates the hot spot characteristics of stronger local ambient source impacts on personal exposures. Non-ambient sources were also found as significant contributors to personal exposures to benzene and toluene for the population studied.
Sheng-Wei Wang; Xiaogang Tang; Zhi-Hua Fan; Xiangmei Wu; Paul J Lioy; Panos G Georgopoulos
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of the Air & Waste Management Association (1995)     Volume:  59     ISSN:  1096-2247     ISO Abbreviation:  J Air Waste Manag Assoc     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-07-16     Completed Date:  2009-08-18     Revised Date:  2013-06-02    
Medline Journal Info:
Nlm Unique ID:  9503111     Medline TA:  J Air Waste Manag Assoc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  733-46     Citation Subset:  IM    
Exposure Science Division, Environmental and Occupational Health Sciences Institute, a Joint Institute of the University of Medicine and Dentistry of New Jersey-R. W. Johnson Medical School and Rutgers University, Piscataway, NJ, USA.
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MeSH Terms
Air Movements
Air Pollutants / chemistry*
Air Pollution
Environmental Exposure*
Environmental Monitoring / methods*
Models, Theoretical
New Jersey
Time Factors
Grant Support
Reg. No./Substance:
0/Air Pollutants

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

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