LOS ANGELES (AP) - A federal judge has ruled that a Southern California clean-air agency may impose its anti-smog rules on state and local public fleet vehicles. Last year, the U.S. Supreme Court ruled that the South Coast Air Quality Management District could not enforce rules requiring private fleets to use engines that burn cleaner fuels. The high court sent the case to a lower court to determine whether the regulations could be applied to public fleets. "The court has concluded that the fleet rules are constitutional as applied to state and local governments," U.S. District Court Judge Florence-Marie Cooper...