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Overview of Results from the Multiple Air Toxics Exposure Study – III (MATES-III) . Philip M. Fine, Ph.D. South Coast AQMD National Air Quality Conference April 8, 2008. Authors/Contributors.

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overview of results from the multiple air toxics exposure study iii mates iii

Overview of Results from the Multiple Air Toxics Exposure Study – III(MATES-III)

Philip M. Fine, Ph.D.

South Coast AQMD

National Air Quality Conference

April 8, 2008

authors contributors
Authors/Contributors
  • Jean Ospital, Tom Chico, Joe Cassmassi, Tuyet-le Pham, Aaron Katzenstein, Bong-Mann Kim, Philip Fine, Sumner Wilson, Rudy Eden, Libby Ayers, Dale Barber, Steven Barbosa, Tracy Basler, Rene Bermudez, Roger Bond, Malou Cartwright, Wimol Chanjamsri, Paul Chavez, Alice Chen, Corie Choa, Amy Chun, Kris Collins, Monique Davis, Alicia Diaz, Jorge Diez, Lila Enriquez, Jeremy Graham, Tracy Goss, Sam Guo, Refaat Hanna, Sheri Hanizavareh, Sandra Hom, Dan Houghton, Tai-Ching Hu, Judy Hwa, Eddie Hwang, Laura Julius, Cindy Kirkpatrick, Mike Koch, Sally Kou, Jong Hoon Lee, Kay Liu, Eddie Lui, Jason Low, Joe Macias, Ricardo Morales, Richard Parent, Tom Parsons, Ed Ruffino, Ken Sanchez, David Sawyer, Mike Shu, Steve Taw, Solomon Teffera, Lyovit Usares, Brian Vlasich, Thy Vo, Jill Whynot, Paul Williamson, Sumner Wilson, Robert Yi, Xinqiu Zhang
background
Background
  • Multiple Air Toxics Exposure Study (MATES I): 1987
  • MATES II: 1998-99
  • MATES III: 2004-2006
  • SCAQMD Environmental Justice Initiatives
  • Focus on toxics exposure and risk
    • PM mortality not included
key components
Key Components
  • Monitoring
  • Emissions inventory
  • Modeling
  • Technical Advisory Group input on study plan and draft report
enhancements to mates iii
Enhancements to MATES III
  • Monitoring done every 3 days
  • Data collected over 2 years: April ‘04 – March ‘06
  • Added PM2.5 samples
  • Added naphthalene, PAHs, PM organic tracers
  • Updated method (CMB) to estimate diesel PM
  • Latest 2007 AQMP inventory used
  • Improved spatial allocation of truck emissions
  • Updated modeling platform consistent with AQMP
statistics
Statistics
  • ~18,000 samples collected
  • ~37,000 analyses performed
  • ~911,000 data points produced
mates iii monitoring sites

Sun Valley

Sun Valley

Burbank

Burbank

Fontana

Fontana

San Bernardino

San Bernardino

Los Angeles

Los Angeles

Industry

Commerce

Pico Rivera

Pico Rivera

Commerce

Rubidoux

Rubidoux

Huntington Park

Huntington Park

Compton

Compton

Long Beach

North Long Beach

Anaheim

Anaheim

Wilmington/W. Long Beach

Wilmington

Santa Ana

Santa Ana

Indio

Indio

Temporary Sites

Temporary Sites

Fixed Sites

Fixed Sites

MATES III Monitoring Sites
elemental carbon pm 10
Elemental Carbon - PM10
  • 10 % reduction attributable to new analytical instruments
  • Net reduction of 28 %
mates iii monitoring
MATES III Monitoring
  • General trend is down for air toxics levels
  • Estimated basin wide lifetime risk 1,200 per million
  • Mobile source toxics account for 94% of risk
  • Diesel accounts for 84% of air toxics risk
  • Non-diesel risk lower by 50%
chemical mass balance cmb model
Chemical Mass Balance (CMB) Model
  • Used monthly-averaged ambient data with speciated particulate organics
  • EPA CMB version 8.2
  • Estimate source contributions to ambient concentrations of PM2.5 mass
  • Widely used in scientific community
  • Suggested by Technical Advisory Group
slide21

PM2.5 Chemical Analysis

  • Elemental Carbon (EC)
  • Organic Carbon (OC)
  • Ionic species (NO3-, SO42-, NH4+, Na+, Cl-)
  • Metals (Al, Si, Fe, etc.)
  • Organic compounds (75)
    • Analyses conducted by DRI
    • PAHs (coronene, indeno [1,2,3-cd]pyrene, benzo(ghi)perylene, etc.)
    • Hopanes, steranes (sterane 48, hopane 17, etc.)
    • Alkanes (phytane, docosane, etc.)
    • Polars (guaiacols, syringols, levoglucosan, cholesterol, organic acids, etc.)
mates iii emissions inventory
MATES III Emissions Inventory
  • Estimated emissions of toxics for 2005
  • Mobile sources dominate air toxics emissions
    • Account for 93% of potency weighted emissions
    • Diesel PM contributes 87% of potency weighted emissions of carcinogens
  • Using updated methodology to back cast to 1998 - emissions show a decrease in potency weighted toxics emissions of 15%
mates iii modeling
MATES III Modeling
  • Updated emissions and modeling
    • CAMx - consistent with AQMP
    • AQMP inventory updated for toxics
    • Improved geographical assignment of diesel vehicle miles – Caltrans/SCAG model
    • Updated meteorology for 2005 consistent with AQMP
    • EMFAC2007 vs EMFAC7G
    • Larger modeling domain
  • Grid cell with highest risk at the ports
  • Area of increased risk near Central L.A.
  • Estimated risks consistent with monitoring data
modeled risk comparison
Modeled Risk Comparison
  • Population weighted risk: 810/million
  • 17% below MATES II
    • Emission inventory updates
    • Meteorology inputs
    • Modeling methodology
next steps
Next Steps
  • 90 day public review recently closed
  • Draft report and technical appendices available on AQMD web site
  • Technical Advisory Group review
  • Public outreach ongoing
  • Final report
  • Air Toxic Control Plan update: Summer 2008