The Texas Supreme Court is scheduled to hear oral arguments in City of Houston v. BCCA Appeal Group, Inc., on March 25, 2015 regarding whether the application of a City of Houston registration ordinance which purports to regulate air pollution within the City of Houston’s borders is preempted by the Texas Clean Air Act of 1967 (TCAA). The First District Court of Appeals held that the defendants “failed to show that the Legislature intended to preempt the Ordinance with ‘unmistakable clarity,’ and thus, failed to meet its extraordinary burden to establish that the ordinance is invalid, 2013 Tex. App. LEXIS 11089 (Tex. Ct. App. Aug. 29, 2013). The City of Houston is clearly concerned that the Texas Commission on Environmental Quality’s enforcement of the TCAA has not been very vigorous. We should expect to see a decision in this important case a few months .