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Proposed Revisions to EPA’s Guideline on Air Quality Models

On 07/29/2015, EPA’s proposed revision to the air quality modeling guideline (Appendix W to 40 CFR Part 51) was published.  http://www.gpo.gov/fdsys/pkg/FR-2015-07-29/pdf/2015-18075.pdf Appendix W Factsheet: http://www.epa.gov/ttn/scram/11thmodconf/2015_NPR_Appendix_W-Fact_Sheet.pdf Summary: Proposed enhancements to the scientific formulation of the preferred nearfield dispersion model, AERMOD, including modeling techniques to address the secondary chemical formation of fine particle and ozone pollution from direct, single ...

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AERMOD Dispersion Model Version 15181 Released

On 07/24/2015, EPA released an updated version of the AERMOD model. Key technical changes in the new version are as follows: Includes option in AERMET to adjust the surface friction velocity (u*) to address issues with AERMOD model over prediction under stable, low wind speed conditions. Includes a low wind option in AERMOD to address ...

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PM2.5 Permit Modeling Guidance Issued

US EPA released the “Guidance for PM2.5 Permit Modeling” document on May 20, 2014. Key points include: The guidance addresses PM2.5 compliance demonstration steps for new major sources, existing major source modifications, and PSD increment analysis for minor sources located in counties that have established PM2.5 minor source baseline dates. In the past EPA was unable to specify ...

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