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Atlanta PM2.5 Attainment Modeling with AERMOD Yan Huang, James Boylan, Peter Courtney, and Michelle Bergin (Georgia EPD – Air Protection Branch) 2009 Region 4 Modelers Workshop March 18, 2009. Outline. Background Local AERMOD Modeling Updated 2012 DVF Projections. Background. Objective.

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  1. Atlanta PM2.5 Attainment Modeling with AERMODYan Huang, James Boylan, Peter Courtney, and Michelle Bergin (Georgia EPD – Air Protection Branch)2009 Region 4 Modelers WorkshopMarch 18, 2009

  2. Outline • Background • Local AERMOD Modeling • Updated 2012 DVF Projections

  3. Background

  4. Objective Elevated PM2.5 concentration in Atlanta non-attainment area: • Regional/urban scale sources • Local sources Demonstrate attainment in 2012?

  5. Location of Core Urban Sites Doraville Health E.Rivers 2.9mile F.S.#8 2.2mile Jeff. St. South-DeKalb Forest Park East Point

  6. Annual Average PM2.5(Stations <3 miles from Fire Station #8)

  7. Railyard and Fire Station #8 Fire Station #8

  8. CMAQ PM2.5 Projections * Local Increment at Fire Station #8 = 1.8 mg/m3

  9. CMAQ 12-km Grid Cell

  10. AERMOD Modeling for Local Sources

  11. Local PM2.5 Sources • Rail Yards • Inman, Tilford, and Howells • On-Road Mobile • Marietta Blvd., Marietta St., and Bolton Rd. • Local Industrial Facilities • Plant McDonough, Meadwestvaco Packaging Systems, others

  12. Model Set-Up • 2002-2006 five year simulation • Elevated terrain (AERMAP) • Five-hundred meter receptors • Seasonal surface parameters with twelve 30-degree wind sectors (AERSURFACE) • Meteorological data • Peachtree City NWS upper air • Atlanta Hartsfield airport NWS surface observation

  13. AERMOD Modeling Domain Provided by B. Kim, GA EPD

  14. Locomotive Activity • Two Class I railroad companies • Norfolk Southern • CSX Transportation • Two locomotive activity categories • Line-haul • Switching

  15. 2012 Emission Reductions • Railyard • 30 Genset replacement by 2012 (currently 42 yard switchers) • 93% PM2.5 emission reduction per Genset • Mobile • ARC link-based VMT data • 50 ~ 60% reduction

  16. Locomotive PM2.5 Emission

  17. Mobile Emission

  18. Local Facilities Unit: tons/yr

  19. Railyard and Mobile Source Contribution* to Annual PM2.5 *Results are presented as 5-year average impact (2002 emissions).

  20. Local Facility Contribution* toAnnual PM2.5 at FS#8 *Results are presented as 5-year average impact (2002 emissions).

  21. 2002 PM2.5 Contributions Modeled Local Increment = 4.1438 mg/m3 Measured Local Increment = 1.8 mg/m3

  22. Local Contributions at FS #8 Railyard Reduction (Gensets) = 1.0463 mg/m3 Mobile Reduction = 0.2249 mg/m3

  23. Combining CMAQ and AERMOD Results

  24. Railyard Adjustment to DVF • Percent (%) Reduction in Modeled Local Increment due to Gensets Railyard Controls = (1.0463 mg/m3)/(4.1438 mg/m3) = 25.25% • Reduction in Measured Local Increment due to Gensets Railyard Controls = (1.8 mg/m3) * (25.25%) = 0.4545 mg/m3

  25. Mobile Adjustment to DVF • Percent (%) Reduction in Modeled Local Increment due to Mobile Controls = (0.2249 mg/m3)/(4.1438 mg/m3) = 5.43% • Reduction in Measured Local Increment due to Mobile Controls = (1.8 mg/m3) * (5.43%) = 0.0977 mg/m3

  26. Revised 2012 DVF • Revised 2012 DVF including Local Gensets Railyard & Mobile Controls = Revised 2012 DVF = 2012 DVF – Local Reductions = 15.3564 mg/m3 - 0.4545 mg/m3 - 0.0977 mg/m3 = 14.80 mg/m3 • Plan to redo calculations based on quarterly local increments & quarterly RRFs from AERMOD.

  27. Contact Information Yan Huang, Ph.D.Georgia Dept. of Natural Resources4244 International Parkway, Suite 120Atlanta, GA 30354Yan.Huang@dnr.state.ga.us 404-363-7072

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