A federal judge in Texas has rejected a challenge to a Dallas, Texas, ordinance giving preference to natural gas-fueled taxi cabs. Ass’n of Taxicab Operators, USA v. City of Dallas, No. 10-769 (N.D. Tex. 8/30/10). The ordinance allows taxis running on compressed natural gas to automatically move to the front of the line in taxi queues at Dallas Love Field Airport. Plaintiffs sought a preliminary injunction, arguing that the ordinance was an emissions standard under the Clean Air Act (CAA) and was preempted by federal law. The court disagreed, holding that the ordinance “does not mandate quantitative emissions levels, establish manufacturer requirements, establish purchase requirements, mandate emissions control technology, or establish a penalty or fee system, therefore the ordinance is not a standard” under the CAA.