<p>A federal appeals court on Friday ordered a judge to reconsider her refusal to block portions of a clean-truck program at the nation's busiest port complex.</p>
<p>In an opinion that dismayed environmentalists and labor leaders, the three-judge panel of the U.S. 9th Circuit Court of Appeals based in San Francisco ruled that U.S. District Judge Christina Snyder should grant all or part of the American Trucking Assn.'s request for an injunction halting the implementation of new rules that apply to truck drivers at the ports of Los Angeles and Long Beach.</p>