10th Conference on Air Quality Modeling
Posted: March 21st, 2012
ALL4 attended and presented at U.S. EPA’s 10th Conference on Air Quality Modeling in Research Triangle Park, NC March 13th through 15th. The purpose of the conference, mandated by Section 320 of the Clean Air Act, is to provide an […]
Read articleSO2 NAAQS Implementation Update
Posted: January 31st, 2012
U.S. EPA is continuing to move forward with the sulfur dioxide (SO2) National Ambient Air Quality Standards (NAAQS) Implementation process. U.S. EPA released their “Guidance for 1-Hour SO2 NAAQS SIP Submissions” draft document on September 22, 2011.
Read articleNot So Fast – Getting That Air Permit Won’t Be As Easy As You Think
Posted: January 18th, 2012
Introduction Most of the air regulations promulgated by U.S. EPA are developed and implemented to achieve compliance with the National Ambient Air Quality Standards (NAAQS). The NAAQS represent ambient air concentration levels that are established by U.S. EPA to ensure […]
Read article2011 and Beyond: The Critical Air Quality Issues Affecting Industry
Posted: January 18th, 2012
The December 2010 “year-end” edition of 4 The Record provides a look ahead into 2011. Even with the recent “Change in Climate” associated with the national political scene; we still see a very active U.S. EPA moving forward with their […]
Read articleWhat’s Going On With the 1-Hour SO2 NAAQS Implementation Process?
Posted: January 9th, 2012
Now that we’ve all had some time to digest the plethora of guidance memoranda and updated air quality modeling programs that were released in March and April of 2011 and summarized by ALL4 in our April 4 The Record article […]
Read articleMore Thoughts on SO2 NAAQS
Posted: November 20th, 2011
The public comment period for U.S. EPA’s draft dispersion modeling guidance for the 1-hour sulfur dioxide (SO2) National Ambient Air Quality Standard (NAAQS) is open until December 2, 2011. Since the guidance will lead to a significant and complicated undertaking […]
Read articleNO2 NAAQS Implementation Status Quo (For Now)
Posted: August 19th, 2011
U.S. EPA has posted its responses to states’ initial designation recommendations for the new 1-hour nitrogen dioxide (NO2) National Ambient Air Quality Standard (NAAQS). Determining which areas are attaining or not attaining the 1-hour NAAQS will require the operation of […]
Read articleU.S. EPA Regional, State, and Local Dispersion Modelers Workshop Slides Available
Posted: July 20th, 2011
U.S. EPA has made available the presentations from the U.S. EPA Regional, State, and Local Dispersion Modelers Workshop (Workshop)…
Read articleALL4 Attends U.S. EPA Regional, State, and Local Dispersion Modelers Workshop
Posted: June 13th, 2011
ALL4’s ambient group members Dan Dix and Colin McCall attended the U.S EPA Regional, State, and Local Dispersion Modelers Workshop (Workshop) held in Atlanta, GA on June 9, 2011. The annual meeting, which is hosted by the U.S. EPA Office […]
Read articleAnother Update to AERMOD!!
Posted: May 16th, 2011
On April 12, 2011 U.S. EPA’s Air Quality Modeling Group (AQMG) released another update to the AERMOD (now version 11103) air dispersion model on the Support Center for Regulatory…
Read article