New ozone limit could halt D.C. road, rail fixes - Chamber

摘要

A more stringent ozone standard could threaten transportation projects in and around thernnation's capital, the U.S. Chamber of Commerce said in a report released today.rnU.S. EPA in November proposed to tighten the national ozone limit from 75 parts per billion --rnlast set in 2008 during the George W. Bush administration -- to between 65 and 70 ppb.