OAR Policy and Guidance Metarecord

Document Title/Subject: Chemical Speciation of PM2.5 in Urban and Ruran Areas: Background Information Related Documents: Guidance for Designating Areas for Implementation of the National Air Quality Standards for Fine Particles	Signed by: unsigned Signature Date: Contact: Fred Dimmick 919-541-5537	Filename(s): http://www.epa.gov/ttn/oarpg/t1/reports/cspm25_bid.pdf URL(s):
Regulatory Authority: Title 1	Division/Director: Air Quality Strategies and Standards Division (OAQPS) / Lydia Wegman	Submitted By: whitfield.gail	OGC Contact: Kevin McLean OGC Phone#: 919-564-5564	Internet Contact: Jeff Clark
Document Type: Background Information Documents	EPA Document Number: Federal Register:	Supersedes:
Subject Category: PM	Keywords: Particulate matter urban areas rural areas IMPROVE monitoring measurements	Terms: Air quality Clean Air Act CAA
Abstract: Data from the Interagency Monitoring of PROtected Visual Environment (IMPROVE) and the Speciation Trends Network (STN) are used to analyze the chemical composition of PM2.5 and to explore issues associated with interpretation of their measurements. The data from the largely rural IMPROVE network and urban STN are used to examine spatial patterns and to develop estimates of the local urban excess over the regional background concentrations. This work will give some insights into which of the chemical constituents are driving urban excess of PM2.5 mass in different regions of the United States.

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