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Environmentalists are seeking to intervene on EPA's behalf in litigation where coal company Murray Energy is challenging the agency's Oct. 1 decision to tighten its ozone national ambient air quality standard (NAAQS) as too strict, with advocates saying that although they would prefer an even stricter limit they want to defend EPA's revised standard.

Power industry groups are urging EPA to ensure that the agency's federal plan for implementing its existing power plant greenhouse gas rule in recalcitrant states provides as much flexibility as the underlying rule provides to states that submit their own implementation plans.

The Health Effects Institute (HEI) research group in a new report says that a pair of epidemiological studies of truckers and miners exposed to diesel engine exhaust could be useful for quantitative risk assessments, but says there are lingering uncertainties in the studies that will have to be addressed in any risk analysis.

A federal district court judge has rejected a Tennessee city's novel attempt to throw out a Clean Water Act (CWA) citizen suit on the grounds that the suit constitutes an "abuse of process," extortion and coercion, allowing to move forward on the merits a case that has drawn Department of Justice (DOJ) involvement due to other aspects of the city's defense.

A major water resources management organization is organizing a "peer network" of state regulators working on water quality and supply planning, hoping to pool technical, data and funding techniques in order to improve states' water resources planning efforts to meet both state needs and also requirements from EPA and other federal agencies.

A chemical industry attorney says EPA would likely face lawsuits if it finalizes its proposed nanoscale materials data collection rule without further consulting with industry, arguing the agency's public record supporting the plan lacks information to address criticism raised in comments -- though an environmentalist says further delay is unnecessary.