On August 13, 2019, the U.S. Environmental Protection Agency (EPA) announced the Twelfth Conference on Air Quality Modeling.  The modeling conference, mandated by Section 320 of the Clean Air Act, was held on the EPA RTP, NC Campus from October 2^nd through 3^rd, 2019.  The purposes of the Twelfth Modeling Conference was to provide an overview of the latest features of the currently preferred air quality models and to provide a forum for public review and comment on potential revisions to the way the EPA determines and applies the appropriate air quality models in the future.

The following topics were presented:

I.   Conference overview;
II.  Currently preferred air quality models status and updates;
III. Expert panel discussions and invited presentations on model/technique enhancements:
          - Treatment of low wind conditions
          - Overwater modeling
          - Mobile source modeling
          - Building downwash
          - Prognostic meteorological data
          - Near-field and long-range model evaluation criteria
          - NO₂ modeling techniques
          - Plume rise
          - Deposition
          - Single source O₃ and PM_2.5 modeling techniques;
IV.  Model Clearinghouse and modeling guidance updates; and
V. Other presentations by the public.

Disclaimer: The material provided below were presented during the proceedings of the Twelfth Conference on Air Quality Modeling. The information contained in some of these presentations may not reflect U.S. EPA policy and should not be considered as an official endorsement of the Agency. The presentations given on Thursday, October 3, 2019 during the Public Presentation and Comments Session were public comments being presented to the Agency for consideration.

Conference Information:

• Federal Register Notice for the Twelfth Conference on Air Quality Modeling (PDF)(4 pp, 360 K, 08-13-2019)
• Twelfth Modeling Conference Docket (ID No. EPA-HQ-OAR-2019-0454)
• Final Agenda and Presentations (PDF)(2 pp, 225 K, 10-02-2019)
   

Transcripts and Audio Recordings:

• Twelfth Modeling Conference - Day 1 Transcripts (PDF)(284 pp, 2 MB, 10-02-2019)
• Twelfth Modeling Conference - Day 1 Audio Recording - Part 1 (WMA) (51 MB, 10-02-2019)
• Twelfth Modeling Conference - Day 1 Audio Recording - Part 2 (WMA) (28 MB, 10-02-2019)
• Twelfth Modeling Conference - Day 1 Audio Recording - Part 3 (WMA) (76 MB, 10-02-2019)
• Twelfth Modeling Conference - Day 1 Audio Recording - Part 4 (WMA) (27 MB, 10-02-2019)
   
• Twelfth Modeling Conference - Day 2 Transcripts (PDF)(258 pp, 1 MB, 10-03-2019)
• Twelfth Modeling Conference - Day 2 Audio Recording - Part 1 (WMA) (9 MB, 10-03-2019)
• Twelfth Modeling Conference - Day 2 Audio Recording - Part 2 (WMA) (11 MB, 10-03-2019)
• Twelfth Modeling Conference - Day 2 Audio Recording - Part 3 (WMA) (12 MB, 10-03-2019)
• Twelfth Modeling Conference - Day 2 Audio Recording - Part 4 (WMA) (7 MB, 10-03-2019)
   

Conference Review Material:

• A full archive of review materials for the Twelfth Conference on Air Quality Modeling can be found at:
  ftp://newftp.epa.gov/Air/aqmg/SCRAM/conferences/2019_12th_Conference_On_Air_Quality_Modeling/.
   

Please direct any additional questions concerning the Twelfth Conference on Air Quality Modeling to Mr. George Bridgers, email: Bridgers.George@epa.gov.