Diesel Owners' Turn to Carry the Clean-Air Ball

摘要

With diesel engines lasting as long as 25 years, clean-air officials in states with the worst air are pushing to retire or upgrade older machines in order to make breathing safe for everyone. California's Air Resources Board (ARB) created a rule this summer, which environmental regulators in major metro areas throughout the United States are studying closely, that forces emissions criteria into equipment owners' repair-and-replacement decisions.