4 The Record is a publication from ALL4’s team that takes an in-depth look at technical and regulatory topics.
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 […]
Read article
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 […]
Read article
PFAS: State-by-State Regulatory Update
Posted: July 22nd, 2021
Given the current lack of all-encompassing federal environmental regulation around per- and polyfluoroalkyl substances (PFAS), states are taking it upon themselves to set their own standards amid growing public scrutiny. With proposed house bills, rejections of bills, and other PFAS […]
Read article
My Facility is Subject to the EMACT – What Should I be doing Now?
Posted: July 20th, 2021
The U.S. Environmental Protection Agency (U.S. EPA) finalized amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP): Generic Maximum Achievable Control Technology Standards for Ethylene Production, otherwise known as “EMACT” on July 6, 2020. Is your facility on […]
Read article
Cement and Concrete: What’s the Difference? What Effects Do They Have on Sustainability?
Posted: July 13th, 2021
There are some age-old questions out there: What’s the difference between bourbon and whiskey? A calzone and a stromboli? A fiddle and a violin? What about the difference between cement and concrete? To keep it short and sweet, cement is […]
Read article
New Landfill Air Regulations May Inspire a Round of Tic Tac Toe
Posted: July 9th, 2021
If it seems like you’ve been hearing a lot about air quality regulations for landfills over the last few years, that’s because there are seven different Subparts under Parts 60, 62, and 63 to Title 40 of the Code of […]
Read article
So, Your State Might Join RGGI – What Does that Mean?
Posted: June 30th, 2021
The Regional Greenhouse Gas Initiative (RGGI) is a program that aims to reduce power sector carbon dioxide (CO2) emissions in participating states. The following states are currently part of RGGI: Connecticut Delaware Maine Maryland Massachusetts New Hampshire New Jersey New […]
Read article
California’s Stormwater Reporting Deadlines are Quickly Approaching – Are You Ready?
Posted: June 28th, 2021
Reporting deadlines associated with the Industrial General Permit (IGP) issued by the California State Water Resources Control Board (State Water Board) and several other Stormwater Multi-Sector General Permits are quickly approaching. Specifically, for California, the Annual Report must be submitted […]
Read article
U.S. EPA Development of the CMAQ-PFAS Model and Potential Impacts to PFAS Evaluation
Posted: June 28th, 2021
On May 18, 2021, the United States Environmental Protection Agency (U.S. EPA) Office of Research and Development (ORD) hosted a webinar presenting the current state of research on modeling Per- and Polyfluoroalkyl Substances (PFAS). The webinar, part of the Air, […]
Read article
Texas Rule Changes to Incorporate Project Emissions Accounting for Air Permitting
Posted: June 22nd, 2021
On June 11, 2021, the Texas Commission on Environmental Quality (TCEQ) approved the long-awaited changes to 30 TAC §116 regarding project emissions accounting (PEA). The newly approved changes will become effective on July 1, 2021. Per an interoffice memorandum dated […]
Read article