In a parting gift, EPA finalizes rules to limit its use of science | Ars Technica

"The EPA's new rule, which will be formally published tomorrow, is an attempt to set additional standards for the evidence it considers when establishing new regulations for pollutants. In principle, the rule sounds great: it wants the data behind the scientific papers it uses to be made publicly available before it can be used to support regulatory decisions. In reality, the rule is problematic, because many of these studies rely on patient records that need to be kept confidential. In other cases, the organizations with the best information on some environmental hazards are the companies that produce or work with them, and they may not be interested in sharing proprietary data.

The practical result of this sort of change is that the EPA would be precluded from relying on scientific papers that contained the clearest indications of public harm. This would almost certainly lead to weaker rules or a decision not to regulate at all...."