Clearing the Air

On Friday, the D.C. Circuit decided Murray Energy v. EPA. The court upheld EPA's health-based 2015 air quality standards for ozone against challenges from industry (rules too strong) and environmental groups (rules too weak). However, it rejected a grandfather clause that prevented the new standards from applying to plants whose permit applications were in-process when the standards were issued. It also required EPA to tighten up the "secondary standards" for ozone, which are intended to prevent non-health harms such as damage to vegetation.