2018 Look Ahead
Posted: January 10th, 2018
Introduction to Annual Look Ahead 2018 Colin McCall Portions of this 4 The Record article is available as a podcast episode on ALL4’s Air Quality Insider At ALL4, before we make plans for the year ahead we always look backwards to […]
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TCEQ Air Quality 101 Blog Series: Everything is Bigger in Texas – Including Air Quality Modeling
Posted: November 28th, 2017
Most environmental managers aren’t exposed to air quality modeling requirements unless they’re dealing with a large project that trips the Prevention of Significant Deterioration (PSD) construction permitting program’s Significant Emission Rate (SER)…
Read articleU.S. EPA’s Input on the Future of Air Quality Dispersion Modeling
Posted: November 13th, 2017
On September 25th, the U.S. Environmental Protection Agency (U.S. EPA) held their 2017 Regional/State/Local Modelers’ Workshop in Raleigh, NC. Though I had originally planned to be in my beautiful hometown…
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Sulfur Dioxide Data Requirements Rule Update: The Bell Signals the End of Round 3
Posted: September 17th, 2017
If you haven’t been keeping tabs, a lot has happened since our last update on our SO2 DRR page way back in January 2016. Most recently, U.S. EPA made final recommendations for attainment status for facilities in areas where air dispersion modeling was conducted (Round 3)…
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I (Heart) NY…and Its Meteorological Data Network
Posted: September 6th, 2017
Facilities in New York enjoy an air permitting advantage that is unavailable to facilities located in many other states: a dense network of meteorological data for use in air quality modeling evaluations. The Federal Department of Homeland Security worked with…
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Re-Entrainment. What is it and should you be evaluating it for your site or next project?
Posted: May 17th, 2017
|Who should consider a re-entrainment evaluation?|Information necessary to conduct a re-entrainment evaluation|AERMOD|ASHRAE Minimum Dilution Models|Hospital Example Re-Entrainment Evaluation|Ship Example Re-Entrainment Evaluation|Recommendations| Have you ever seen a plume from a stack swirl around when it gets caught in the wake of […]
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Appendix W Revision: The New Era of Air Quality Modeling – Long Range Transportation Modeling Updates
Posted: March 3rd, 2017
Long Range Transportation, we aren’t talking about the Griswold’s driving cross-country to Walley World and those family car trips to far away one-off destinations (like the World’s Largest Ball of Twine). We’re talking about the atmospheric transport and dispersion of pollutants…
Read articleAppendix W Revision: The New Era of Air Quality Modeling – SO2 Modeling Updates
Posted: March 1st, 2017
If you’ve visited ALL4’s website within the past few weeks (c’mon, don’t you visit daily?), you’ve likely seen a wealth of information regarding the U.S. Environmental Protection Agency (U.S. EPA) revisions to 40 CFR Part 51, Appendix W…
Read articleAppendix W Revision: The New Era of Air Quality Modeling – (Re)Introducing MMIF, an Alternative Option for Met Data
Posted: February 9th, 2017
As a self-described computational meteorologist, I get pretty obsessed with weather models, especially models of severe storms like hurricanes or big winter storms. If the coverage on the local news or weather networks is any indication, I don’t think I’m alone in this. My…
Read articleAppendix W Revision: The New Era of Air Quality Modeling – Introduction
Posted: January 26th, 2017
(UPDATE 1/26/17) The long awaited revisions to the 40 CFR Part 51, Appendix W (also known as the Guideline on Air Quality Models referred to as Guideline hereafter) were finally published in Federal Register (FR) on January 17, 2017. The final Guideline, which was signed by U.S. EPA…
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