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Article: Spatial and temporal variation in [PM.sub.2.5] chemical Composition in the United States for health effects studies.
- Article from:
- Environmental Health Perspectives
- Article date:
- July 1, 2007
- Author:
CopyrightCOPYRIGHT 2007 National Institute of Environmental Health Sciences. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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BACKGROUND: Although numerous studies have demonstrated links between particulate matter (PM) and adverse health effects, the chemical components of the PM mixture that cause injury are unknown.
OBJECTIVES: This work characterizes spatial and temporal variability of [PM.sub.2.5] (PM with aerodynamic diameter $lt 2.5 [micro]m) components in the United States; our objective is to identify components for assessment in epidemiologic studies.
METHODS: We constructed a database of 52 [PM.sub.2.5] component concentrations for 187 U.S. counties for 2000-2005. First, we describe the challenges inherent to analysis of a national [PM.sub.2.5] chemical composition ...