STATES CONSIDER EMISSIONS "BUBBLES" OVER AIRPORTS TO REACH AIR GOALS

States may pursue a novel strategy to regulate ground equipment at airports in plans to meet EPA's ozone and particulate matter (PM) standards, in order to lower pollution from sources that states have not generally regulated in the past, state officials say. States are exploring the concept of airport "bubbles" that would require a certain percentage reduction in pollutants that contribute to ozone and PM, but leave specific decisions in the hands of airport officials on how to control ground...