Letter from AWMA Modeling Committee to EPA Addresses Air Quality Modeling Challenges for PM2.5 and NO2 NAAQS

Two memorandums posted by the U.S. EPA on its Support Center for Regulatory Atmospheric Modeling (SCRAM) website on February 25th and 26th have caused a stir in the regulated community given their implications for facilities that are or will be conducting modeling to demonstrate compliance with the existing PM2.5 NAAQS, the newly promulgated 1-hour NO2 NAAQS (which takes effect April 12, 2010), or the expected 1-hour SO2 NAAQS (due to be finalized later this summer). In response, the Air & Waste Management Association’s AB-3 Meteorology Committee submitted a letter to EPA on March 12, 2010 providing a detailed review of the issues raised by the memos, along with a set of recommendations on the implementation of modeling procedures needed to address the new NAAQS. The AB-3 letter and the possible feedback it generates from EPA’s Air Quality Modeling Group will be of interest to any company facing the need to conduct air quality modeling for these pollutants.

Download the AB-3 Committee’s letter. A copy of the two recent SCRAM memos can be found at http://www.epa.gov/scram001/. For more information, or if you have any questions regarding these matters, please contact your local Trinity office at (800) 229-6655.