Exposure Assessment and Airshed Modeling Applications in Support of SCPC and CHS Projects

EPA Grant Number: R827352C015
Subproject: this is subproject number 015 , established and managed by the Center Director under grant R827352
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).

Center: Southern California Particle Center and Supersite
Center Director: Froines, John R.
Title: Exposure Assessment and Airshed Modeling Applications in Support of SCPC and CHS Projects
Investigators: Froines, John R. , Arey, Janet , Atkinson, Roger , Avol, Edward L. , Cass, Glen , Cho, Arthur K. , Colome, Steven D. , Fukuto, Jon , Gauderman, William , Gong, Henry , Harkema, Jack , Hinds, William C. , Kleinman, Michael T. , Lurmann, Fred , McConnell, Rob Scot , Miguel, Antonio , Nel, Andre E. , Paulson, Suzanne , Peters, John M. , Phalen, Robert , Ritz, Beate R. , Schiestl, Robert H. , Sioutas, Constantinos , Stram, Dan , Turco, Richard , Winer, Arthur M. , Yu, Rong Chun
Current Investigators: Turco, Richard , Lurmann, Fred , Winer, Arthur M. , Wu, Jun , Yu, Rong Chun
Institution: University of California - Los Angeles , California Institute of Technology , Michigan State University , Rancho Los Amigos Medical Center , University of California - Irvine , University of California - Riverside , University of Southern California
Current Institution: University of California - Los Angeles
EPA Project Officer: Hunt, Sherri
Project Period: June 1, 1999 through May 31, 2005 (Extended to May 31, 2006)
RFA: Airborne Particulate Matter (PM) Centers (1999) RFA Text |  Recipients Lists
Research Category: Air Quality and Air Toxics , Particulate Matter , Air


This project is one of four specific studies that focus on emission sources and related adverse health effects. The study hypotheses are that:

  • Mobile source emissions will exacerbate airway inflammation and allergic airway disease and produce cardiopulmonary effects.
  • The magnitude of allergic airway disease and cardiovascular effects from mobile sources are a function of the size distribution of particulate matter (PM).
  • Exposure in proximity to selected freeways with either heavy diesel or gasoline-powered vehicles will cause exacerbation of inflammatory airway health effects, and exposure to ultrafine particles at very close proximity to a freeway will result in the most severe effects.

The principal objective of the modeling component of the Southern California Particle Center and Supersite (SCPCS) is to develop more precise linkages between emission sources, human exposure, and health outcomes, including at the individual level for the Children's Health Study (CHS) cohort and at the population scale for the Los Angeles Basin (LAB). A principal hypothesis is that better characterization of the exposure of individual children in the CHS cohort will increase the robustness of observed health outcomes. A related hypothesis is that, within the framework of the coupled Surface Meteorology and Ozone Generation (SMOG)/Regional Human Exposure Model (REHEX) modeling system, SCPCS field and laboratory measurements can be extrapolated to estimate the population-wide implications of specific airborne materials-gaseous and particulate-and to identify and quantify specific source contributions.

The principal objectives of the study are to:

  • Provide modeling support for several of the projects currently underway in the SCPCS and the CHS-including the freeway and traffic density related studies, the mobile source emissions trajectory study, and the mobile source emissions exposure assessments.
  • Provide a modeling component to the extensive pollutant measurement programs underway in both the Supersite and the various individual projects of the SCPCS/CHS.
  • Offer a possible means for extrapolating the community or near-roadway pollutant levels associated with specific toxicological, animal, and human health outcomes to susceptible or most heavily impacted subpopulations, as well as to the entire regional population of southern California.
  • Create linkages between the science emerging from the SCPCS/CHS programs and the policy and standard-setting goals established by the NRC and EPA.
  • Aid in the design of cost-effective and optimally health-protective emission control strategies for fine particles and particle-associated species.


The overall objective of the Southern California Particle Center and Supersite (SCPCS) is to bring together outstanding scientists from the leading universities in Southern California to identify and conduct high priority research to better understand the effects of particulate matter (PM) and ensure protection of public health. The SCPCS makes use of an integrated approach to address each of the areas of Exposure, Dosimetry, Toxicology, and Epidemiology. This integration is accomplished by seeking out and involving in the Center some of the major figures in air quality and environmental health. A team has been assembled for SCPCS that is committed to the need for strong cross- and interdisciplinary programs of research in order to address the challenging issues posed by PM. By improving our fundamental and observational understanding of the complex relation between particle exposure and human health, it is our goal to lay a firm scientific foundation for effective intervention strategies for public health protection.

Publications and Presentations:

Publications have been submitted on this subproject: View all 6 publications for this subprojectView all 138 publications for this center

Journal Articles:

Journal Articles have been submitted on this subproject: View all 6 journal articles for this subprojectView all 137 journal articles for this center

Supplemental Keywords:

Particulate matter, quinones, PAHs, aldehydes, ketones, allergic airway disease, human exposure models, mobile sources, environmental monitoring, motor vehicle emissions, children's health, indoor air quality, California,, RFA, Health, Scientific Discipline, Air, HUMAN HEALTH, particulate matter, Environmental Chemistry, Air Pollutants, Risk Assessments, Biochemistry, Health Effects, Atmospheric Sciences, particulates, ambient aerosol, asthma, morphometric analyses, toxicology, human health effects, airway disease, ambient measurement methods, air pollution, PAH, particulate exposure, human exposure, toxicity, aerosol composition, allergens, particle concentrator, airborne urban contaminants, human health risk, aerosols, atmospheric chemistry, particle transport

Progress and Final Reports:

  • 1999
  • 2000
  • 2001 Progress Report
  • 2002 Progress Report
  • 2003 Progress Report
  • 2004 Progress Report
  • Final Report

  • Main Center Abstract and Reports:

    R827352    Southern California Particle Center and Supersite

    Subprojects under this Center: (EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
    R827352C001 The Chemical Toxicology of Particulate Matter
    R827352C002 Pro-inflammatory and the Pro-oxidative Effects of Diesel Exhaust Particulate in Vivo and in Vitro
    R827352C003 Measurement of the “Effective” Surface Area of Ultrafine and Accumulation Mode PM (Pilot Project)
    R827352C004 Effect of Exposure to Freeways with Heavy Diesel Traffic and Gasoline Traffic on Asthma Mouse Model
    R827352C005 Effects of Exposure to Fine and Ultrafine Concentrated Ambient Particles near a Heavily Trafficked Freeway in Geriatric Rats (Pilot Project)
    R827352C006 Relationship Between Ultrafine Particle Size Distribution and Distance From Highways
    R827352C007 Exposure to Vehicular Pollutants and Respiratory Health
    R827352C008 Traffic Density and Human Reproductive Health
    R827352C009 The Role of Quinones, Aldehydes, Polycyclic Aromatic Hydrocarbons, and other Atmospheric Transformation Products on Chronic Health Effects in Children
    R827352C010 Novel Method for Measurement of Acrolein in Aerosols
    R827352C011 Off-Line Sampling of Exhaled Nitric Oxide in Respiratory Health Surveys
    R827352C012 Controlled Human Exposure Studies with Concentrated PM
    R827352C013 Particle Size Distributions of Polycyclic Aromatic Hydrocarbons in the LAB
    R827352C014 Physical and Chemical Characteristics of PM in the LAB (Source Receptor Study)
    R827352C015 Exposure Assessment and Airshed Modeling Applications in Support of SCPC and CHS Projects
    R827352C016 Particle Dosimetry
    R827352C017 Conduct Research and Monitoring That Contributes to a Better Understanding of the Measurement, Sources, Size Distribution, Chemical Composition, Physical State, Spatial and Temporal Variability, and Health Effects of Suspended PM in the Los Angeles Basin (LAB)