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,
as published on March 26, 2021.
(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.
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