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Tracking the latest agency and congressional debates over rules to cut emissions of traditional pollutants, and a broad range of novel EPA policies including the agency's shift to a "multipollutant" regulatory approach for individual sectors.

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Tracking the latest agency and congressional debates over rules to cut emissions of traditional pollutants, and a broad range of novel EPA policies including the agency's shift to a "multipollutant" regulatory approach for individual sectors.

First Study Of ACE Emission Impacts Finds 19 States Could See More GHGs

A new peer-reviewed study of the greenhouse gas and other emission effects of EPA's Affordable Clean Energy (ACE) proposal finds the policy would have the perverse outcome of boosting GHGs in 19 states by causing almost one-third of existing coal plants to run more often. The Jan. 15 paper is the first to quantify projected GHG and conventional pollution effects from ACE, and it is raising legal questions about the validity of the Trump administration's approach while also providing ammunition...

Full Study

Fact Sheet

2015 Study


Industry Groups' Intervenor Brief

Industry Groups' Amicus Brief


EPA Fights Suit Challenging Raised Bar For Title V Air Permit Objections

EPA, backed by industry groups and Texas, is fighting environmentalists' lawsuit that claims the agency has raised the bar for challenging Clean Air Act Title V permits by finding that objections to the permits cannot target other permits, defending its policy in an appellate court case similar to at least two other pending lawsuits. In the case, Environmental Integrity Project (EIP) and Sierra Club v. EPA , in the U.S. Court of Appeals for the 5th Circuit, the agency...

Environmentalists' Brief

EPA Brief

Texas Brief

ExxonMobil Brief


Any Vehicle GHG 'Deal' Seen As Unlikely Until After Court Battle Begins

Observers are increasingly expecting that any deal on changes to vehicle greenhouse gas and fuel economy standards is unlikely before the Trump administration finalizes an aggressive rollback of the rules, suggesting debate over the issue will only get more acrimonious -- not less -- in the coming months. Such a dynamic could also make it even more complicated to resolve differences among Trump officials, California-led states and automakers, given that any negotiating would be occurring amid high-stakes litigation over the...

EPA defends 2018 RFS from diverse legal attacks

EPA is defending its 2018 renewable fuel standard (RFS) from diverse legal attacks from refiners, environmentalists and biofuels producers in consolidated litigation set that will again test the agency's discretion to set fuel volumes against biofuel groups' claims they are too low, and refiners' and environmentalists' claims they are too high. Many of the issues raised in the U.S. Court of Appeals for the District of Columbia Circuit suit, American Fuel & Petrochemical Manufacturers, et al. v. EPA ,...

States defend push to consider 'background' ozone in NAAQS

A coalition of states opposed to EPA's tougher 2015 ozone standard is defending its position that EPA should have considered naturally occurring "background" ozone when setting the standard, which they argue should result in a weaker limit because it would account for background ozone levels states are powerless to reduce. In a Jan. 11 filing with the U.S. Court of Appeals for the District of Columbia Circuit, Arizona on behalf of state petitioners in Murray Energy Corp. v. EPA...

EPA Final Brief

Refiners' Final Brief

Refiners' Final Reply Brief

Refiners' Final Intervenor Brief

Environmentalists' Final Brief


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