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California air districts are struggling to implement the state’s landmark AB 617 air monitoring and mitigation program on time, with local officials saying public outreach is slowing the process while environmentalists and others are raising lingering questions on issues including monitoring, emissions reduction rules, and enforcement.

The Canadian mining company Teck Metals is again asking the Supreme Court to review a controversial appellate ruling requiring it to pay cleanup response costs even though the release occurred outside the United States, more than ten years after the company failed to convince the court to consider the issue.

Small-business groups are broadly backing EPA’s plan to narrow the Clean Water Act’s (CWA) reach but appear split on whether the agency’s proposal achieves that goal, with some speakers at a March 19 listening session urging EPA to make major changes to the rule in order to provide more clarity on its scope and other provisions.

Scientists with the consulting firm Ramboll are preparing to re-analyze a landmark 2005 study that led EPA and other agencies to strengthen rules and policies to protect children from even low doses of the potent neurotoxin, saying the study could have overestimated the adverse effects of such exposures due to confounding factors.

EPA’s just-released justification to Congress for its fiscal year 2020 budget details an aggressive plan for shifting significant environmental oversight to states either through delegated authority or slashing programs that complement states’ work, but it also seeks deep cuts to funds that could help states pay for the increased workload.

House Democrats appear likely to step up their oversight of EPA’s implementation of the revised Toxic Substances Control Act (TSCA) after the agency sidestepped their calls to ban workplace uses of methylene chloride in paint strippers, an action they said would not protect workers.

A coalition of at least 23 states says EPA lacks Clean Air Act authority for its proposal to scrap the Obama-era finding that its utility air toxics rule is “appropriate and necessary” because the law generally bars reconsideration of such findings and the agency’s justification for the rollback fails to meet the requirement for reversal.