Guidance on New R-LINE Additions to AERMOD 19191 now available

EPA’s “Guidance on New R-LINE Additions to AERMOD 19191 for Refined Transportation Project Analyses” is now final and available online at:

A direct link to the guidance:

On August 21, 2019, EPA released a new version of its preferred dispersion model, AERMOD 19191. AERMOD 19191 builds upon the previous version of AERMOD, AERMOD 18081, and adds new features from EPA’s R-LINE model. Information about AERMOD and this latest release can be found on EPA’s website at: This guidance is part of the resources EPA is providing with the release of AERMOD 19191. It addresses the use of the new R-LINE features in AERMOD 19191 for dispersion modeling of transportation sources.

Link to the Pre-publication Version of the SAFE Final Rule

On September 19, 2019, the U.S. Department of Transportation’s National Highway Traffic Safety Administration (NHTSA) and the U.S. Environmental Protection Agency (EPA) issued a final action entitled the “One National Program Rule” to enable the federal government to provide nationwide uniform fuel economy and greenhouse gas emission standards for automobile and light duty trucks.

This action finalizes critical parts of the Safer, Affordable, Fuel-Efficient (SAFE) Vehicles Rule that was first proposed in August 2018. The pre-publication rule and fact sheet can be found at:

Proposed DFW and HGB Area SIP and RULE Revisions Available for Early Review

Agenda is scheduled for September 11, 2019, and the comment period would open on September 13, 2019.