(a) Applicability. The provisions of this division apply in the Beaumont-Port Arthur, Bexar County, Dallas-Fort Worth, El Paso, and Houston-Galveston-Brazoria areas as defined in §115.10 of this title (relating to Definitions) and in Bastrop, Caldwell, Comal, Gregg, Guadalupe, Hays, Nueces, Travis, Victoria, Williamson, and Wilson Counties to all persons using volatile organic compound-containing solvent for cold solvent degreasing processes, open-top vapor degreasing processes, and conveyorized degreasing processes. The provisions in §115.412(b) of this title (relating to Control Requirements) do not apply in the Dallas-Fort Worth area until the commission publishes notice in the Texas Register, as provided in §115.419(f) of this title (relating to Compliance Schedules), and the provisions of §115.412(c) of this title do not apply in the Houston-Galveston-Brazoria area until the commission publishes notice in the Texas Register, as provided in §115.419(g) of this title.(b) Definitions. Unless specifically defined in the Texas Clean Air Act (Texas Health and Safety Code, Chapter 382) or in §§3.2, 101.1, or 115.10 of this title (relating to Definitions), the terms in this division have the meanings commonly used in the field of air pollution control.