SECTION 112.221. Definitions

Unless specifically defined in the Texas Clean Air Act (Texas Health and Safety Code, Chapter 382), or in §101.1 or §112.1 of this title (relating to Definitions, respectively), the terms in this division have the meanings commonly used in the field of air pollution control. The following meanings apply in this division unless the context clearly indicates otherwise.

(1) Block one-hour average--An hourly average of data, collected starting at the beginning of each clock hour of the day and continuing until the start of the next clock hour (e.g., from 12:00:00 to 12:59:59).

(2) Continuous Monitoring--Monitoring for which readings are recorded at least once every 15 minutes.

(3) Hutchinson County sulfur dioxide (SO₂) nonattainment area--The portion of Hutchinson County designated by the United States Environmental Protection Agency (EPA) as nonattainment for the 2010 SO₂ National Ambient Air Quality Standard, 40 Code of Federal Regulations §81.344.

(4) Production unit--The carbon black oil furnace or group of carbon black oil furnaces, dryers or groups of dryers, and any ancillary units used in the manufacture of carbon black and producing tail gas.

(5) Tail gas--The exit gaseous stream of a carbon black oil furnace consisting of water vapor, carbon monoxide, hydrogen, pyrolysis by-products, and reduced and organic sulfur compounds as a result of the manufacture of carbon black.

Source Note: The provisions of this §112.221 adopted to be effective October 27, 2022, 47 TexReg 6985