All4 Inc. articles

The revised Final-Form Reasonably Available Control Technology (RACT) 2 Rule was approved by the Pennsylvania Environmental Quality Board (EQB) on November 17, 2015.  It’s now in the last administrative stages on its way to being finalized and published in the Pennsylvania Bulletin.  As an air quality rule that applies to major sources located within the Commonwealth of Pennsylvania, RACT 2 could potentially have a significant impact on a facility’s nitrogen oxides

As we do each year, ALL4 looks ahead to the upcoming new year and evaluates the air quality regulatory topics that may matter most to the regulated community. For 2016, it certainly will be the year of Boiler MACT, as facilities gear up to prepare plans and conduct performance testing. We see a continuing trend of electronic reporting and public access to such data. Finally, Federal enforcement initiatives and recently implemented programs are driving new monitoring requirements for aff

ALL4’s Oil and Gas Sector Initiative was conceived in response to the renewal of the domestic oil and gas industry, associated primarily with the use of hydraulic fracturing (or fracking) and horizontal drilling in shale formations (e.g., Marcellus, Haynesville, Bakken, Eagle Ford) and the impact of greatly expanded oil and gas production on gathering/midstream operations, gas transmission/distribution systems, and domestic oi

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 3 nitrogen dioxide (NO₂) atmospheric chemical reaction screening techniques as default methods, applicants will no longer need to gain U.S. EPA approval after the Guideline revisi

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 W to 40 CFR Part 51) (Guideline) on the U.S. EPA’s Support Center for Regulatory Atmospheric Modeling (SCRAM) website. In addition, a fact sheet summariz

As of January 1, 2015 the U.S. Environmental Protection Agency (U.S. EPA) has been implementing the Cross-State Air Pollution Rule (CSAPR) through a Federal Implementation Plan (FIP) that primarily impacts electric generating units (EGUs).  

This article reviews the transition of the Clear Air Interstate Rule and nitrogen oxide (NO₂), sulfur dioxide (SO₂) allowances to CSAPR allowances and rules.  Read on for an expl

You have seen ALL4 documenting the corresponding evolution of the NAAQS levels since the current U.S. EPA administration started in January 2009, and we will continue to follow them closely and provide you with updates that we think are important to your operations.  The following sections provide updates on the most important NAAQS and how you can plan for them today.  Discusses SO2, air dispersion modeling and ambient