Philadelphia’s Air Toxics Regulations in Effect as of January 1, 2024
Posted: June 25th, 2024
The City of Philadelphia’s Air Management Services’ (AMS) new Air Management Regulation (AMR) VI Toxics Rule and health risk screening workbook went into effect January 1, 2024. The AMR VI rule had been finalized at an Air Pollution Control Board […]
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PM2.5 NAAQS Lookahead: Revision of the Annual Standard is Imminent
Posted: January 9th, 2024
Another year has gone by and another lookahead article about potential lowering of the particulate matter less than 2.5 microns (PM2.5) National Ambient Air Quality Standard (NAAQS) is front and center. In last year’s lookahead article I wrote about the […]
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Proposed Revisions to the “Guideline on Air Quality Models”
Posted: October 24th, 2023
On October 23, 2023, the United States Environmental Protection Agency (U.S. EPA) published a proposed rule to revise 40 CFR Part 51, Appendix W (the “Guideline on Air Quality Models” or “Guideline”). The proposed revisions include enhancements to the formulation […]
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U.S. EPA releases Draft Cumulative Risk Assessment Guidelines for Planning and Problem Formulation
Posted: August 22nd, 2023
On June 16, 2023, the United States Environmental Protection Agency (U.S. EPA) released a draft document “Cumulative Risk Assessment (CRA) Guidelines for Planning and Problem Formation” that describes the steps for the planning of CRAs and offers guidance for when […]
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Incorporation of Monte Carlo Statistical Simulation Techniques in an Air Dispersion Modeling Analysis
Posted: February 6th, 2023
This article appears in the February 2023 issue of EM Magazine, a copyrighted publication of the Air & Waste Management Association (A&WMA; www.awma.org). Read on A&WMA
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2023 Air Quality Monitoring Look Ahead
Posted: January 26th, 2023
In our 2022 Air Quality Monitoring Look Ahead, we looked at community organized low-cost monitoring networks, the continued use of Federal Reference Method (FRM) and Federal Equivalent Method (FEM) air quality monitoring, and funding for community partnerships for implementation of […]
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ALL4’s Texas 2023 Look Ahead
Posted: January 25th, 2023
The new year is upon us, and ALL4 is looking forward to the changes and challenges it will bring. Whether the concerns are related to air, water, waste, or health and safety, we are here to assist and find solutions […]
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PM2.5 Annual NAAQS Proposed to be Lowered
Posted: January 11th, 2023
After completing the White House Office of Management and Budget (OMB) review on December 27, 2022, the much anticipated proposal to lower the annual particulate matter of less than 2.5 microns (PM2.5) National Ambient Air Quality Standard (NAAQS) was officially […]
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ALL4’s Texas 2022 Look Ahead
Posted: January 18th, 2022
Is it just us, or did time fly? While we ended 2021 with COVID still around us, it’s unclear if we are heading into 2022 or 2020-too… I am hoping for a year of lifting mandates and a return to […]
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2022 Look Ahead – Part 3
Posted: January 18th, 2022
The 2022 Look Ahead is a multi-part series consisting of 20 articles to celebrate ALL4’s 20th anniversary. View Part 1 View Part 2 Air Toxics Look Ahead // Amy Marshall There are many things going on in the world of […]
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