PM 10-2.5 Methods Update and Network Design Presentation for WESTAR San Diego, CA September 2005...
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Transcript of PM 10-2.5 Methods Update and Network Design Presentation for WESTAR San Diego, CA September 2005...
PM10-2.5 Methods Update and Network Design
Presentation for WESTARSan Diego, CA
September 2005
Peter TsirigotisDirector
Emissions, Monitoring, and Analysis Division;
U.S. EPA Office of Air Quality, Planning and Standards
PM10-2.5 Methods Update
• Multi-city field study of commercially available PM10-2.5 technologies completed and reviewed by CASAC Technical Subcommittee in 2004– Included continuous methods for hourly data and filter-based
methods to obtain integrated daily samples • Additional field study in Phoenix completed spring 2005
– Several technologies modified to improve performance prior to this study
• New field study being deployed in Birmingham, AL• Upcoming meeting of the CASAC scheduled for September
21-22, 2005 to provide:– Peer review on a PM10-2.5 Federal Reference Method (FRM)– Consultations on the evaluation of PM10-2.5 field studies, optimization
of the PM2.5 FRM, equivalency criteria for PM2.5 and PM10-2.5, and data quality objectives for PM10-2.5.
– Materials available at: http://www.epa.gov/ttn/amtic/files/ambient/pm25/casac/casacmemo.pdf
PM10-2.5 Methods Update
Take Home Messages:
• Filter-based difference method (separate low-volume FRMs for PM10 and PM2.5) has better data quality compared to other commercially available methods– Not expected to be widely deployed, but will serve as basis of comparison
for approving continuous methods• Continuous method evaluations have demonstrated high sample
completeness, and good precision and correlation between methods– Biases do exist between methods; however, new studies may address this
• Samplers potentially usable for speciation– Coarse channel of filter-based dichotomous sampler– Analysis of PM10 filter and subtraction of Speciation Trends Network PM2.5
data– Customized samplers specially designed for this purpose
• Data Quality Objectives demonstrate the value of continuous methods to reduce uncertainty in support of a potential daily PM10-2.5 standard
• Available epidemiological evidence is being considered in designing the coarse particle monitoring network.– Greatest health concern in urban areas where particles become
enriched with contaminants from road dust and industrial sources
– Less concern for exposure to natural materials of geologic origin– Lack of evidence limits conclusions on toxicity of agricultural and
mining sources• CASAC concluded that available evidence from health
studies suggests focus on urban, not rural coarse particles.
• More narrowly defined indicator (UPM10-2.5) proposed to characterize risk from urban sources such as re-suspended road dust typical of high traffic-density areas and emissions from industrial sources
PM10-2.5 Network Design
• Proposed design similar in concept to PM2.5 monitoring for the daily standard– Focus on areas of high population density and
proximity to primary industrial sources of urban particles
– Rural monitoring as part of NCore Level 2 multi-pollutant sites
– Speciation requirements under consideration• Minimum EPA monitoring requirements based
on criteria including population size and estimated UPM10-2.5 concentrations
• Draft changes to 40 CFR 58, Appendix D and E must be signed for NPRM by December 20, 2005
PM10-2.5 Network Design