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LEHDER News

New Air Dispersion Model Versions

     Posted by LEHDER News on

LEHDER Air Modeling ServicesThe MOECC has announced they will be adopting new updated versions of several regulatory air dispersion models shortly.  These models have been updated by the USEPA based on the latest available science.  The MOECC announcement to formally adopt new model versions was intended to provide clarity and consistency to the regulated community and stakeholders.  The mandatory use of the new versions of AERMOD, AERMET and ASHRAE models will become effective as of the date the MOECC posts an Information Notice on the EBR.  Based on the MOECC announcement, the posting of the Notice is expected in October 2015 which is  only a few months from now.

The new versions of AERMOD and AERMET will be version 14134 (dated May 14, 2014). The ASHRAE calculation method will be updated to the 2011 ASHRAE Handbook – HVAC Applications.

The transition to the new model versions can be complex depending upon the status of your ECA, pending ECA Application or abatement plans.  Once the new model version comes into effect, any modeling triggered for regulatory purposes must be completed using the new version unless your facility has a Section 7(1) notice.  Now is the time to evaluate how changes to the air dispersion models may affect your facility’s compliance.  

To learn more about how the new model version transition may affect your facility, please contact Penny McInnis at pmcinnis@lehder.com or (519) 336-4101 ext. 245.