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PM 2.5 Stakeholder Working Group Meeting #1

The purpose of the working group is to provide input on PM2.5 significance thresholds and calculation methodology for air quality analysis. The group consists of environmental organizations, public agencies, and regulated organizations.

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PM 2.5 Stakeholder Working Group Meeting #1

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  1. PM 2.5 Stakeholder Working Group Meeting #1 South Coast Air Quality Management District June 8, 2006

  2. Working Group • Purpose – provide input on: • PM2.5 significance thresholds • PM2.5 calculation methodology • Significance thresholds are necessary in analyzing local and regional PM 2.5 air quality impacts in CEQA and NEPA air quality analysis

  3. Working Group Members • Environmental Organizations • Public Agencies • Regulated Organizations

  4. PM 2.5 • Particulate Matter less than or equal to 2.5 microns • Mostly derived from combustion sources • Mobile sources - auto, trucks • Stationary sources – ICEs • Directly emitted or formed in atmosphere from combustion of gases (such as NOx and SOx combining with ammonia)

  5. PM 2.5 Standards • Federal PM 2.5 standards established in 1997 • State PM 2.5 standards established in 2002

  6. PM2.5 Air Quality

  7. Trends of Basin PM2.5 (µg/m3)

  8. PM2.5 and the 2007 AQMP • Three-year planning document will outline control strategy to achieve standards • Federal annual PM2.5 standard (15 µg/m3) to be met by 2015 (including five-year extension) • VOC and SOx reductions needed to achieve PM2.5 standards • On-going modeling, development of inventory and control measures, etc.

  9. PM2.5 Calculation Methodology • PM emissions typically contain specific fractions of PM10 and PM2.5 • California Emission Inventory Data and Reporting System (CEIDARS) lists wide variety of industrial processes and PM size speciation • PM2.5 fraction of PM10 established • Apply PM2.5fraction of PM10 for appropriate process

  10. Localized Significance Thresholds • Effects of PM2.5 on nearby receptors, such as residents, hospitals. schools, etc. • Operational • PM2.5 generated from combustion sources • Construction • Fugitive dust • Off-Road construction equipment

  11. LST - Operational • PM10 significance threshold 2.5 µg/m3 (Rule 1303, Table A-2) • 2003 AQMP PM Inventory (2005-2010) demonstrated PM2.5 is 99 percent of PM10 in stationary source fuel combustion • Recommended operational PM2.5 LST same as PM10 (2.5 µg/m3)

  12. LST - Construction • Fugitive Dust • 2003 AQMP PM Inventory (2005-2010) demonstrated PM2.5 is 21 percent of fugitive dust PM10 • PM10 construction LST 10.4 µg/m3 • PM2.5 fugitive dust LST 2.2 µg/m3 (21 percent of 10.4 µg/m3)

  13. LST – Construction • Off-Road Construction Equipment • 2003 AQMP PM Inventory (2005-2010) demonstrated PM2.5 is 89 percent of combustion PM10 from Off-Road Equipment • Unquantifiable contribution from combustion PM from off-road sources • Recommended construction PM2.5 LST at 2.5 µg/m3 (same as operational LST).

  14. Regional Significance Threshold • PM2.5 suspended for longer periods resulting in regional effects • EPA proposed significant emission rate of 10 tons per year for PM2.5 (Federal Register, Sept 8, 2005) • 10 tons per year = 55 pounds per day • Recommending construction and operational regional PM2.5 significance threshold same as EPA (55 pounds/day)

  15. Schedule • Working Group review until June 23 • 2nd Working Group Meeting early July • Public Workshop late July • Recommendations to Governing Board Meeting on September 8, 2006 • Effective Dates: • Begin public outreach after Board approval • Request implementation by public agencies early 2007

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