Air Quality Modeling

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 […]

Read article

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 […]

Read article

2022 Look Ahead – Part 2

Posted: January 12th, 2022

The 2022 Look Ahead is a multi-part series consisting of 20 articles to celebrate ALL4’s 20th anniversary. View Part 1 Toxics Release Inventory (TRI) – How to Prepare for 2022 Recordkeeping and Reporting // Sheryl Watkins Since its creation in […]

Read article

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 […]

Read article

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

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 […]

Read article

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 […]

Read article


    Sign up to receive 4 THE RECORD articles here. You'll get timely articles on current environmental, health, and safety regulatory topics as well as updates on webinars and training events.
    First Name: *
    Last Name: *
    Location: *
    Email: *