Critical Timelines for the SO2 Data Requirements Rule
Posted: January 19th, 2016
We are now approaching the “home-stretch” of the SO2 Data Requirements Rule (DRR). State agencies were due to provide U.S. EPA with a list of the affected facilities where SO2 air quality will be characterized on January 15, 2016. The next critical…
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It’s a Cluster#$%&…Top Challenges Facing Facilities Subject to SO2 Data Requirements Rule
Posted: September 10th, 2015
For a while now ALL4 has been writing about the Sulfur Dioxide (SO2) Data Requirements Rule (DRR), including our most recent update on the final SO2 DRR. For those who are new to the process…
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Sulfur Dioxide (SO2) Data Requirements Rule (DRR): The Final Rule
Posted: August 19th, 2015
On August 10, 2015, the U.S. Environmental Protection Agency (U.S. EPA) submitted the final version of the DRR (40 CFR Part 51, Subpart BB) for the 2010 one (1)-hour sulfur dioxide (SO2) National Ambient Air Quality Standards (NAAQS). The final rule looks pretty familiar…
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A Review of 1-Hour NO2 NAAQS Air Quality Modeling
Posted: August 18th, 2015
During the development of this 4TR article, proposed revisions to Appendix W to 40 CFR Part 51 “ Guideline on Air Quality Models (Guideline) were published in the Federal Register. As a result of revisions which propose to establish Tier […]
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Proposed Revisions to the Guideline on Air Quality Models (Appendix W)
Posted: July 27th, 2015
On July 14, 2015, the U.S. Environmental Protection Agency’s (U.S. EPA’s) Office of Air Quality Planning and Standards’ (OAQPS) Air Quality Modeling Group provided a pre-Federal Register (FR) publication of the proposed revisions to the Guideline on Air Quality Models (Appendix […]
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Happening Now: Air Quality Study by Aircraft Over Oil and Gas Production Areas
Posted: April 14th, 2015
Beginning the week of March 22, 2015, an aircraft carrying a suite of meteorological and ambient monitoring instruments began a field campaign aimed at studying the air over oil and gas production areas. The study, named the Shale Oil and Natural Gas Nexus…
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Final Area Designations for the 2012 Annual PM2.5 Standard
Posted: February 23rd, 2015
As recounted in Dan Dix’s historic 4 the Record Article, on December 14, 2012, U.S. EPA announced the revised annual National Ambient Air Quality Standard (NAAQS) for fine particulate matter…
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Annual ALL4 Look – Ahead to 2015
Posted: January 26th, 2015
2014 ushered in many new air quality regulatory requirements, some of which have already reached their effective compliance date, others that will become effective in the coming weeks, months and years. Equally prominent in 2015 will be the implementation of […]
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Posted: December 22nd, 2014
As discussed in my recent blog, there has recently been some buzz surrounding the ozone primary and secondary National Ambient Air Quality Standards (NAAQS). Due to the proposed decrease in the ozone NAAQS and the possibility of them causing more ozone nonattainment areas…
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April Showers Bring…Proposed Modeling Updates for 2015!
Posted: November 24th, 2014
If there’s one thing that the regulated community can agree on, it’s their concern over the challenges related to air quality modeling. Industry is all too familiar with the conservative modeling results for their proposed projects, which can trigger stricter emissions controls…
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