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Revisions to Guideline on Air Quality Models Effective

Revisions to Guideline on Air Quality Models Effective

  • 5/25/2017 7:42:00 AM
  • View Count 683
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. 
Delayed - Revisions to Guideline on Air Quality Models (Appendix W)

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

  • 3/17/2017 7:20:00 AM
  • View Count 932
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.