4 The record articles

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 […]

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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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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 […]

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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 […]

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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 […]

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