Update of study conducted by National Economic Research Associates (NERA) Economic Consulting and commissioned by National Association of Manufacturers (NAM) reveals that revising ozone standard from 75 ppb to 65 ppb, as proposed by EPA, could reduce GDP by $140 billion/day and carry compliance price tag of $1.1 trillion. NAM President and CEO Jay Timmons said ozone standard revisions threaten manufacturing sector as well as U.S. economy.