4 The record articles

4 The Record is a publication from ALL4’s team that takes an in-depth look at technical and regulatory topics.

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What is the U.S. EPA Air Office Working on These Days?

Posted: June 21st, 2019

Update: On June 26, 2019, U.S. EPA Assistant Administrator Bill Wehrum has stepped down from his role in the Office of Air and Radiation.  The regulated community may see delays in rulemaking until a permanent replacement is named.  Please check […]

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A Message to Our Clients – Growth at ALL4…

Posted: June 18th, 2019

“Growth” is a word that has been used A LOT here at ALL4 recently.  Whether it is growth in the number of consultants, or new offices (check out our new Raleigh Office Announcement), or new leadership and technical opportunities for […]

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Texas SIP Emission Inventory Revisions for Sites in Bexar County

Posted: June 13th, 2019

In case you have not been following, the U.S. Environmental Protection Agency (U.S. EPA) designated Bexar County (San Antonio area) as nonattainment for the 2015 eight-hour ozone National Ambient Air Quality Standard (NAAQS). This designation was effective on September 24, […]

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The Ever-Evolving Science of Air Quality Modeling

Posted: June 3rd, 2019

One of the reasons I’ve enjoyed air quality modeling during my 16-year career with ALL4 is because it’s an ever-evolving science.  The air quality modeling that I was learning and conducting 16 years ago is vastly different than the air […]

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So, You Thought You Were Through With RACT 2 – Think Again

Posted: May 22nd, 2019

On April 23, 2016, the Pennsylvania “RACT 2 Rule” (i.e., Additional RACT Requirements for Major Sources of NOX and VOCs) was published final in the Pennsylvania Bulletin.  The rule includes provisions intended to meet Reasonably Available Control Technology (RACT) requirements […]

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Upcoming Updates to Texas Nonattainment Reclassification

Posted: May 7th, 2019

At this year’s Air and Waste Management Association (AWMA) Gulf Coast Chapter (GCC) Annual Conference, several folks from ALL4’s Houston Office had the opportunity to hear from Donna Huff of the Air Programs Division at the Texas Commission on Environmental […]

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