DC Circuit Court Vacates and Remands PM2.5 SILs and SMC
Posted: February 7th, 2013
In a decision that could have far reaching permitting implications, the United States Court of Appeals for the District of Columbia Circuit (Court) on January 22, 2013 vacated and remanded portions…
Read articleLooks Like The Existing Lead NAAQS Is Good – For Now
Posted: January 30th, 2013
On January 11, 2013, U.S. EPA released a draft policy paper regarding the agency’s current outlook on the lead national ambient air quality standard (NAAQS). The Clean Air Act (CAA) requires…
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Looking Towards 2013 from a Consultant’s Perspective
Posted: December 28th, 2012
Here we are again at year’s end, another year older and wiser (hopefully). We made it through another election, the “fiscal cliff,” Hurricane Sandy, the Mayan end of the world, and the final episode of the Jersey Shore MTV series. […]
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Musings on Monitoring: The Who, What, When, Why, and How of Atmospheric Measurements
Posted: October 30th, 2012
The installation and operation of ambient pollutant and meteorological monitors has never traditionally been a part of the laundry list of environmental tasks at most facilities. Ambient monitoring installations by facilities have been limited to consent decrees and large Prevention […]
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How the SO2 NAAQS Came Crashing Down On Us
Posted: June 27th, 2012
The sulfur dioxide (SO2) landscape looked very different in 2008 than it does today. At that time, the annual, 24-hour, and 3-hour National Ambient Air Quality Standards (NAAQS) for SO2 had been in place for a long time. Except for […]
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SO2 NAAQS Stakeholder Workgroups: Party Like It’s 2010
Posted: May 29th, 2012
U.S. EPA has set the stage for 1-hour sulfur dioxide (SO2) NAAQS stakeholder workgroups to be held on May 30, May 31, and June 1, 2012.
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Latest News On The 1-Hour SO2 NAAQS Implementation Process
Posted: May 10th, 2012
On April 12, 2012, U.S. EPA’s assistant secretary Gina McCarthy recently sent letters to States outlining updates to the implementation procedures of the 1-hour sulfur dioxide (SO2) National Ambient Air Quality Standard (NAAQS). The major news
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Urgent – SO2 Implementation Update
Posted: April 20th, 2012
U.S. EPA has recently provided state air quality regulatory agencies with an update of the sulfur dioxide (SO2) 1-hour National Ambient Air Quality Standard (NAAQS) designation process. The significant news is that U.S. EPA will no longer require that air dispersion modeling for individual facilities
Read articleU.S. EPA Classifies Fracking Equipment as Non-Intermittent
Posted: April 5th, 2012
U.S. EPA has determined that emissions from drilling and well completion equipment at high-volume hydraulic fracturing (fracking) operations should not be considered intermittent emissions sources in relation to dispersion modeling for short-term…
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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 […]
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