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EPA has cited chemical company Chemours for violating the Toxic Substances Control Act (TSCA) at two of its plants that manufacture per- and polyfluoroalkyl (PFAS), a sign that environmentalists say may indicate stepped-up EPA enforcement over the issue though they say it also raises concerns about the accuracy of EPA's PFAS data.

Chemical industry officials are urging Congress to quickly approve legislation renewing EPA’s authority to collect industry fees to support quick pesticide registration reviews, with the agency poised to imminently lose its power because lawmakers did not renew it as part of the broad funding deal to avert another government shutdown.

Local air regulators in Southern California are claiming that the Trump EPA's cursory analysis of the conventional emission co-benefits of Obama-era vehicle greenhouse gas standards is “illogical on its own terms,” amplifying legal arguments by states and environmentalists that the agency's decision to weaken the standards was unlawful.

Environmentalists and other plaintiffs are considering asking the U.S. Court of Appeals for the District of Columbia Circuit to review the Trump EPA's policy barring any recipient of an EPA grant from serving on one of its many scientific advisory committees after a federal district court dismissed their suit.

EPA and the Sierra Club are defending the agency’s right to ask courts for injunctive relief that forces facilities to impose air pollution controls for years-old violations of Clean Air Act new source review (NSR) permit mandates, as they fight a utility sector push to rehear a ruling that broadly upheld EPA’s power to seek such relief.

Environmentalists are suggesting they will sue EPA if the if the agency finalizes as proposed its plan to delay deciding which parts of the country have attained the 2008 ozone national ambient air quality standard (NAAQS), calling the postponement both “illegal” and “inexcusable.”

EPA appears to have halted the long-running and controversial effort by its research office to assess the human health risks of formaldehyde, a move that could bolster efforts by the chemical industry which is preparing for the possibility that EPA's toxics office may select the chemical for evaluation, an approach the industry has long favored.