2002 Progress Report: Hazardous Air Pollutant Mixtures: Measuring and Modeling Complex Exposure

EPA Grant Number: R827928
Title: Hazardous Air Pollutant Mixtures: Measuring and Modeling Complex Exposure
Investigators: Adgate, John L. , Pratt, Greg , Ramachandran, Gurumurthy , Sexton, Ken , Zhang, Junfeng
Current Investigators: Adgate, John L. , Church, Timothy , Pratt, Greg , Ramachandran, Gurumurthy , Sexton, Ken , Zhang, Junfeng
Institution: University of Minnesota , Minnesota Pollution Control Agency , University of Medicine and Dentistry of New Jersey
EPA Project Officer: Chung, Serena
Project Period: December 20, 1999 through December 19, 2002 (Extended to June 19, 2004)
Project Period Covered by this Report: December 20, 2001 through December 19,2002
Project Amount: $510,012
RFA: Urban Air Toxics (1999) RFA Text |  Recipients Lists
Research Category: Air Quality and Air Toxics , Air

Objective:

The proposed research project, which builds on existing U.S. Environmental Protection Agency (Science to Achieve Results Grant R825241: Measurement and Source Apportionment of Human Exposures to Toxic Air Pollutants in the Minneapolis-St. Paul Metropolitan Area) and University of Minnesota-funded studies in the Minneapolis-St. Paul Metropolitan area, has two objectives: (1) to examine the relationships between ambient monitoring (i.e., outdoor central sites), indoor air monitoring, and personal-exposure monitoring for a mixture of selected hazardous air pollutants (HAPs) (i.e., particle-bound metals in the PM2.5 size fraction and volatile organic compounds [VOCs]); and (2) to examine the relationships between ambient modeling results and monitoring results for exposures to VOCs and metals.

In the course of attaining these objectives, this research project will test several related hypotheses, including: (1) central-site measurements of metal concentrations in the PM2.5 fraction provide reasonable estimates (i.e., within a factor of 2) of indoor concentrations for these particle-bound metals; (2) central-site measurements of metal concentrations in the PM2.5 fraction provide reasonable estimates (i.e., within a factor of 2) of personal-exposure concentrations for these particle-bound metals; (3) the variability in personal metals concentrations in the PM2.5 fraction is related to the variability in indoor at-home metals concentrations in the PM2.5 fraction; (4) the variability in personal exposure to metals in the PM2.5 fraction is related to the variability in indoor at-home and personal VOC levels; (5) for the general population of adults, personal-exposure concentrations for a complex mixture of metals and VOCs can be predicted based on time-activity profiles and ambient dispersion modeling of these HAPs; (6) for the general population of adults, the primary sources contributing to indoor and personal exposure to a complex mixture of metals and VOCs can be predicted based on ambient-source apportionment modeling results; and (7) continuous measures of indoor PM2.5 levels can be used to characterize and explain day-to-day variability in 24-hour gravimetric samples.

Progress Summary:

The following tasks have been completed to date: (1) summary statistical analysis of trace-metal concentration data obtained by x-ray fluorescence analysis of the outdoor PM2.5 central site filters; (2) completion of digestion and chemical analysis using high-resolution inductive coupled plasma mass spectroscopy of more than 800 outdoor, indoor, and personal PM2.5 samples; (3) completion of quality assurance of the trace metals analytical results; (4) continued development of an integrated database of all outdoor, indoor, and personal VOC and PM measurements from the HAP study; (5) completion of an updated (1999) VOC emissions inventory and new ambient dispersion modeling of VOC concentrations in the Minneapolis-St. Paul airshed; and (6) completion of an analysis of continuous measures of indoor and outdoor PM2.5 concentrations.

Future Activities:

In the final year of this research project, we will conduct statistical analyses and modeling of the trace metals in the PM2.5 fraction. We will conduct the exposure modeling described in the objectives above, prepare papers for publication in peer-reviewed journals, and produce a final report.


Journal Articles on this Report : 3 Displayed | Download in RIS Format

Other project views: All 9 publications 7 publications in selected types All 7 journal articles
Type Citation Project Document Sources
Journal Article Adgate JL, Ramachandran G, Pratt GC, Waller LA, Sexton K. Spatial and temporal variability in outdoor, indoor, and personal PM2.5 exposure. Atmospheric Environment 2002;36(20):3255-3265. R827928 (2002)
R827928 (2003)
R827928 (Final)
R825241 (Final)
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  • Journal Article Adgate JL, Ramachandran G, Pratt GC, Waller LA, Sexton K. Longitudinal variability in outdoor, indoor, and personal PM2.5 exposure in healthy non-smoking adults. Atmospheric Environment 2003;37(7):993-1002. R827928 (2002)
    R827928 (2003)
    R827928 (Final)
    R825241 (Final)
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  • Journal Article Pratt GC, Wu CY, Bock D, Adgate JL, Ramachandran G, Stock TH, Morandi M, Sexton K. Comparing air dispersion model predictions with measured concentrations of VOCs in urban communities. Environmental Science & Technology 2004;38(7):1949-1959. R827928 (2002)
    R827928 (2003)
    R827928 (Final)
    R825241 (Final)
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  • Supplemental Keywords:

    air, exposure, toxics, particulates, volatile organic compounds, VOCs, Minnesota, MN, particles, environmental monitoring., RFA, Scientific Discipline, Toxics, Air, Geographic Area, Waste, Ecosystem Protection/Environmental Exposure & Risk, air toxics, Environmental Chemistry, Chemistry, State, chemical mixtures, Monitoring/Modeling, indoor air, tropospheric ozone, Biology, 33/50, carbon tetrachloride, environmental monitoring, monitoring, particulate matter, cumulative exposure, Minnesota, MN, air pollutants, ambient particle properties, chemical characteristics, particulate, Toluene, stratospheric ozone, mass spectrometry, VOCs, air pollution, benzene, Chloroform, analytical chemistry, PM2.5, atmospheric monitoring, indoor air quality, Volatile Organic Compounds (VOCs), air quality, atmospheric chemistry, heavy metals

    Progress and Final Reports:

    Original Abstract
  • 2000 Progress Report
  • 2001 Progress Report
  • 2003 Progress Report
  • Final Report