When a source seeks an air permit, one of its biggest questions is often: how exacting must my emissions controls be? The Clean Air Act answers that question through several technology-based standards, each with different...more
Under the Clean Air Act, EPA regulates six criteria pollutants through the National Ambient Air Quality Standards (“NAAQS”) program. EPA sets primary and secondary NAAQS that states must meet through regulation of stationary...more
The Environmental Defense Fund and 16 other health, community, and environmental organizations (collectively, “EDF”) filed in the United States District Court for the Northern District of California a Complaint for...more
On April 10, 2026, U.S. EPA proposed to redesignate the Cleveland, Ohio area to attainment for the 2015 ozone National Ambient Air Quality Standards (NAAQS) (the Proposed Rule) – an action that, if finalized, will facilitate...more
The United States Environmental Protection Agency (“EPA”) issued a January 6th Order denying a Petition objecting to the issuance of a Clean Air Act Title V Operating Permit (“Permit”) for the Holly Energy Partners, L.P.,...more
On February 27, 2026, U.S. EPA issued a proposed rule that, if finalized, would position the Cleveland, Ohio Nonattainment Area for redesignation to attainment of the 2015 ozone National Ambient Air Quality Standard (NAAQS)....more
EarthJustice and several other organizations filed a February 5th Petition for Judicial Review (“Petition”) in the 19th Judicial District Court/Parish of East Baton Rouge appealing the Lousiana Department of Environmental...more
The Environmental Protection Agency has taken measures to roll back the “good neighbor” rule, which limits smokestack emissions affecting downwind areas in neighboring states under the Clean Air Act (CAA)....more
On January 21, 2026, the House Committee on Energy and Commerce reported a package of bills that, if enacted, would constitute the most significant amendments to the Clean Air Act (CAA) since 1990....more
Earlier this week, the New York Times reported that the Trump administration plans to stop assigning dollar values to the human health benefits resulting from the imposition of national ambient air quality standards....more
105 groups and organizations (“EOs”) sent a December 16th letter to the United States Environmental Protection Agency (“EPA”) Administrator opposing the agency’s Motion for Vacatur (“Motion”) in the United States Court of...more
Welcome to Industrials Regulatory News and Trends. In this regular bulletin, DLA Piper lawyers provide concise updates on key developments in the industrials sector to help you navigate the ever-changing business, legal, and...more
The United States Environmental Protection Agency (“EPA”) filed a Motion for Vacatur (“Motion”) in the United States Court of Appeals for the D.C. Circuit in regard to pending challenges to the PM2.5 Clean Air Act National...more
Last week, the Environmental Protection Agency issued its “Policy on Provisions to Allow Wildland Prescribed Fire in Clean Air Act State Implementation Plans” in accordance with Section 4 (Strengthening Wildfire Mitigation)...more
The United States Environmental Protection Agency (“EPA”) Office of Inspector General (“OIG”) issued on September 15th a report titled: Evaluation of the EPA’s Oversight of State and Local Ambient Air Monitoring Operating...more
The Subcommittee on Environment of the United States House of Representatives Energy and Commerce Committee held a hearing on June 11, titled: Short-Circuiting Progress: How the Clean Air Act Impacts Building Necessary...more
The United States Environmental Protection Agency (“EPA”) issued a September 2nd interpretive letter addressing the definition of “Begin Actual Construction” in the Clean Air Act New Source Review (“NSR”) regulations....more
The Arkansas Department of Energy and Environment – Division of Environmental Quality (“DEQ”) submitted on August 6th to the United States Environmental Protection Agency (“EPA”) a document titled: ARKANSAS AMBIENT AIR...more
The U.S. Supreme Court issued a pair of decisions in EPA v. Calumet Shreveport Refining and Oklahoma v. EPA on June 18, 2025, resolving two related circuit splits regarding proper venue for challenging certain U.S....more
One hundred environmental organizations transmitted an April 21st letter to the United States Environmental Protection Agency (“EPA”) Administrator asking that the federal agency: …maintain and promptly implement a vital,...more
In a significant development for Arizona’s business community and environmental policymakers, the U.S. Environmental Protection Agency (EPA) has paused its planned reclassification of Maricopa County from “Moderate” to...more
Effective May 2024, EPA tightened the annual health-based National Ambient Air Quality Standard (NAAQS) for fine particulate matter (PM2.5) from 12.0 µg/m3 to 9.0 µg/m3. This change was made after a review of the available...more
Under the Clean Air Act, sources frequently must undergo “New Source Review” (NSR) permitting, which is a pre-construction permitting program. NSR establishes requirements for new or modified sources prior to initiating...more