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Air Quality Modeling Update

Air Quality Modeling Update. May 23, 2012 Air Directors Meeting Presented by: Rick Gillam EPA Region 4, APTMD (404) 562-9049 gillam.rick@epa.gov. 10 th Conference on Air Quality Models. Held March 13-15, 2012 at EPA Office in RTP, NC

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Air Quality Modeling Update

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  1. Air Quality Modeling Update May 23, 2012 Air Directors Meeting Presented by: Rick Gillam EPA Region 4, APTMD (404) 562-9049 gillam.rick@epa.gov

  2. 10th Conference on Air Quality Models • Held March 13-15, 2012 at EPA Office in RTP, NC • Section 320 of the CAA requires a conference be held every 3 years • Purpose is provide an overview of EPA’s preferred models and provide a forum for public review and comment • Public Comment Period open until June 15, 2012 • Presentations available on EPA SCRAM website, transcripts available soon • Highlights: • EPA presentations on AERMOD and CALPUFF Modeling Systems • Challenges of Modeling new 1-hr NO2 and SO2 NAAQS • PM2.5 Modeling • Emerging modeling techniques (e.g., single source O3 modeling) • Full day of Public Presentations on many issues, including enhancements to AERMOD and CALPUFF, 1-hr NAAQS modeling, new modeling techniques (e.g., SCIPUFF/SCICHEM)

  3. 2012 Regional, State & Locals Modelers’ Workshop • Held April 30-May 4, 2012 in Chicago, Illinois • 40 CFR Part 51, Appendix W provides for periodic workshops to discuss modeling issues and provide supplementary guidance • 2012 Workshop had 3 parts • Days 1-2: NSR/PSD Permit Modeling • Days 4-5: Photochemical/Regional-scale SIP Modeling • Day 3: Cross-over Permit/SIP modeling issues

  4. Highlights from 2012 Modelers’ Workshop • NSR/PSD Modeling: • AERMOD & CALPUFF Updates • Challenges of Modeling new 1-hr NO2 and SO2 NAAQS • SO2 NAAQS Implementation Modeling • NSR/PSD Policy Updates – PM2.5 SILs litigation • State Presentations: Intermittent Emissions Sources, 1-hr modeling, Using maximum wind speeds to limit off-site inventories • Photochemical SIP Modeling: • Ozone/PM2.5 Modeling Guidance Revisions and Attainment Test Updates • Current Regional Modeling Efforts (e.g., SEMAP) • CMAQ & CAMx Model Revisions and Evaluations • Case Studies (e.g., Salt Lake, UT & Fairbanks, AK and other areas) • Cross-over issues: • Single-source O3 and PM2.5 Modeling • Interpollutant Trading Ratios • Prognostic Met Data use for dispersion modeling (MMIF)

  5. Hot Topics • PM2.5 SILs litigation – Sierra Club challenge • Limiting size of SIA based on wind speeds • Ambient Air issues when modeling 1-hr NO2 and SO2 NAAQS • AERMOD Wake Effects (downwash) for all stack heights, including above GEP (and grandfathering) • NO2 modeling issues: Tier 3 assumptions, NO2/Nox in-stack ratios and ambient ratios • Approvals for use of Tier 3 – currently requires Regional office approval for each specific case • Idea of monitoring in-lieu-of or addition to modeling if modeling shows violations that can’t be solved • Single-source ozone and secondary PM2.5 modeling techniques • January 2012 Memo from Gina McCarthy

  6. 2012 Region 4 Modelers’ Workshop • Planning to hold a Region 4 Modelers’ Workshop in Fall 2012 at EPA Region 4 Offices in Atlanta, GA • Discuss both NSR/PSD and Photochemical Modeling Issues • We encourage modeling representatives from all Region 4 States and Locals to attend

  7. Questions? Contact: Rick Gillam Air Quality Modeling and Transportation Section EPA Region 4 404.562.9049 gillam.rick@epa.gov

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