The Latest News on Air Quality Requirements in Oregon
Posted: December 6th, 2021
ALL4 has been keeping track of various air quality requirements in Oregon over the past few years. We provide an update on the state’s air quality modeling, regional haze, and greenhouse gas (GHG) requirements below. Air Quality Modeling The Oregon […]
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Updates to Guidance on Ozone and Fine Particulate Matter Permit Modeling Issued by U.S. EPA
Posted: October 8th, 2021
U.S. EPA’s Office of Air Quality Planning and Standards (OAQPS) published the “Revised DRAFT Guidance for Ozone and Fine Particulate Matter Permit Modeling” (Revised Draft Guidance) on September 20, 2021. The Revised Draft Guidance replaces the initial “DRAFT Guidance for Ozone […]
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Proposed Changes to New Hampshire Air Toxics Rules and Potential Ramifications to Stakeholders
Posted: September 22nd, 2021
ALL4 is pleased to continue providing updates regarding changes to New Hampshire air toxics rules and the impacts to stakeholders responsible for compliance. In April 2021, ALL4 presented, “Changes to the New Hampshire Air Toxics Rule: What Could it Mean […]
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Ambient Monitoring Networks and Environmental Justice
Posted: August 5th, 2021
In May 2021 the Air & Waste Management Association (A&WMA) virtually presented the Air Quality Measurements Conference. Amongst the many discussions around the advancements in measurements of air quality, the most common themes revolved around the advancement of citizen-science air […]
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U.S. EPA to Reconsider PM2.5 NAAQS
Posted: July 23rd, 2021
On June 10, 2021 U.S. EPA announced that it would reconsider the previous administration’s decision to retain the particulate matter less than 2.5 microns (PM2.5) National Ambient Air Quality Standard (NAAQS). The previous administration made its final decision to retain […]
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U.S. EPA Releases Updated Version (21112) of the AERMOD Modeling System
Posted: May 24th, 2021
On May 11, 2021, the United States Environmental Protection Agency (U.S. EPA) released an updated version of the American Meteorological Society/Environmental Protection Agency Regulatory Model (AERMOD) Modeling System. The update, dated 21112, includes documentation, executables, and source code for the […]
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The Fifth Revision of the TCEQ’s Penalty Policy Finalized
Posted: February 24th, 2021
Policy Finalized The Texas Commission on Environmental Quality (TCEQ) recently finalized their Penalty Policy which will result in higher fees and more violation events for industry. These changes were motivated by recent incidents that have caused significant public and environmental […]
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Status of the National Ambient Air Quality Standards (NAAQS)
Posted: February 22nd, 2021
The U.S. Environmental Protection Agency (EPA) was hard at work at the end of 2020, finalizing several regulatory actions related to the NAAQS. The Clean Air Act (CAA) requires U.S. EPA to review, and revise if necessary, the NAAQS on […]
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2021 Look Ahead: Priorities for a Year of Accelerated Change
Posted: January 21st, 2021
// Colin McCall Each year in our annual Look Ahead Article we face a challenge: assess the landscape in front of us as it exists in January, and attempt to predict how that landscape might shift to identify the most […]
Read articleProposed Changes to Standards of Performance for Volatile Organic Liquid Storage Vessels Could Save Money, Cut Emissions
Posted: December 7th, 2020
U.S. Environmental Protection Agency (U.S. EPA) has proposed a revision to 40 CFR Part 60, Subpart Kb [Standards of Performance for Volatile Organic Liquid (VOL) Storage Vessels (Including Petroleum Liquid Storage Vessels) for Which Construction, Reconstruction, or Modification Commenced After […]
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