On October 1, 2015, the United States Environmental Protection Agency (“EPA”) adopted stricter regulation on ozone emissions that will fall heavily on California, and most particularly on the transportation sector, including airlines. The new standard strengthens limits on ground level ozone to 70 parts per billion (“PPB”), down from 75 PPB adopted in 2008. The EPA’s action arises from the mandate of the Clean Air Act (“CAA”), from which the EPA derives its regulatory powers, 42 U.S.C. § 7409(a)(1), and which requires that pollution levels be set so as to protect public health with an “adequate margin of safety. 42 U.S.C. § 7409(b).
A Federal Court has recently thrown open the door to potential civil challenges to both private and governmental sources of greenhouse gas emissions, based on the Federal common law of nuisance. For those who believe the Environmental Protection Agency (EPA) has acted too slowly in promulgating greenhouse gas regulation, civil actions are now possible at least in the Second Circuit. However, the Supreme Court may now scrutinize the Second Circuit’s decision. Based on a recent Fourth Circuit decision on a similar issue, the “Nine” may be tempted to follow in Moses’ footsteps and pare down the Second Circuit decision to apply only to greenhouse gas emissions from Federal projects.