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Archive by tag: modelsReturn

Revisions to Guideline on Air Quality Models Effective

• 5/25/2017 8:42:00 AM
• View Count 3502

On May 22, 2017 the United States Environmental Protection Agency (EPA) announced that the revisions to air dispersion modeling requirements in Appendix W of 40 CFR Part 51 became effective.  The final rule includes several new or updated model options that help alleviate model over-prediction or allow for more appropriate source characterization. 

Update to Meteorological Data for Inclusion of New Processor Default

• 5/24/2017 4:53:00 PM
• View Count 3544

On January 17, 2017 the final revisions to the Guideline on Air Quality Models (Appendix W) were published in the Federal Register.  The effective date of the rule was subsequently delayed but became effective on May 22, 2017.

Delayed - Revisions to Guideline on Air Quality Models (Appendix W)

• 3/17/2017 8:20:00 AM
• View Count 3563

On March 15, 2017 the United States Environmental Protection Agency (EPA) announced that they extended the temporary delay of the effective date for the revisions to Appendix W.  The final rule, published in the Federal Register on January 17, 2017, has a new effective date of May 22, 2017.  The additional delay is intended to provide incoming EPA officials time to review the rule.

Update to Meteorological Data Used for Dispersion Modeling

• 1/3/2017 3:09:00 PM
• View Count 3729

On December 20, 2016, the EPA finalized updates to the Guideline on Air Quality Models (Appendix W) as well as updated versions (v16216) of AERMOD, AERSCREEN and AERMET.