A taxi drivers association has challenged as preempted by the Clean Air Act an ordinance recently enacted in Dallas, Texas, allowing taxis that run on compressed natural gas to automatically move to the front of the line in taxi queues at Love Field Airport. Ass’n of Taxicab Operators USA v. Dallas, No. 10-769 (N.D. Tex. filed 04/15/10). Plaintiffs argue that the ordinance is preempted because automobile emissions are a matter of federal policy under the CAA. The city argues that the CAA does not preempt the ordinance because it does not establish an emissions standard. A hearing on the preliminary injunction is scheduled for May 4, 2010. Plaintiffs argue that the injunction is necessary because lost revenues caused by the ordinance are not legally compensable.