Skip common site navigation and headers
United States Environmental Protection Agency
Exposure Research
Begin Hierarchical Links EPA Home > Research & Development > Exposure Research > Publications/Presentations > End Hierarchical Links

 

Sheds-PM: A Population Exposure Model for Predicting Distributions of PM Exposure and Dose from Both Outdoor and Indoor Sources

spacer
spacer
Abstract: The US EPA National Exposure Research Laboratory (NERL) has developed a population exposure and dose model for particulate matter (PM), called the Stochastic Human Exposure and Dose Simulation (SHEDS) model. SHEDS-PM uses a probabilistic approach that incorporates both variability and uncertainty to predict distributions of PM exposure, inhaled dose, and deposited dose for a specified population. SHEDS-PM estimates the contribution of PM from both outdoor and indoor sources (e.g., cigarette smoking, cooking) to total personal PM exposure and dose.

SHEDS-PM generates a simulation population using US Census demographic data for the user-specified population, and randomly assigns each simulated individual an appropriate activity diary from NERL's Consolidated Human Activity Database (CHAD). A time series of PM exposure for each individual is determined from calculated microenvironmental PM concentrations and the time spent in each microenvironment. Inhaled dose is determined using activity-specific ventilation rates, and deposited dose is estimated using a conventional pulmonary deposition model (total deposited to three regions of the lung). Output from the SHEDS-PM model includes distributions of exposure and dose for the specified population, as well as exposure and dose profiles for each simulated individual.

An executable version of the SHEDS-PM model with a graphical user interface (GUI) is now publicly available. The GUI allows the user to define the modeling scenario of interest, to select input data files, and to modify various input parameters. The user is only required to provide ambient outdoor PM concentration data (measured or modeled), and to specify the population of interest.

This work has been partially funded by the United States Environmental Protection Agency under Contract No. 68-W-99-002 to Science Applications International Corporation. It has been subjected to Agency review and approved for publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.

spacer
Citation:Burke, J. M., R. Vedantham, T. R. Mccurdy, J. Xue, and A. H. Ozkaynak. Sheds-PM: A Population Exposure Model for Predicting Distributions of PM Exposure and Dose from Both Outdoor and Indoor Sources. Presented at International Society of Exposure Analysis, Stresa, Italy, September 21-25, 2003.
spacer
spacer
Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
spacer
Division: Human Exposure & Atmospheric Sciences Division
spacer
Branch: Exposure Modeling Research Branch
spacer
Product Type: Abstrct/Oral
spacer
Presented: 09/22/2003
spacer
Related Entries:
spacer
Bullet Item Population Exposure and Dose Modeling for PM and Its Components
spacer Relationship Reason:   A Project of the Product
spacer
spacer
spacer

 

ORD Home | Search EPA | Search NERL | Search EIMS | Contacts | Help

 
Begin Site Footer

EPA Home | Privacy and Security Notice | Contact Us

Last Updated on Monday, October 22, 2007
URL: http://cfpub.epa.gov