technological system of continuous emission reduction
(7) The term “technological system of continuous emission reduction” means— (A) a technological process for production or operation by any source which is inherently low-polluting or nonpolluting, or (B) a technological system for continuous reduction of the pollution generated by a source before such pollution is emitted into the ambient air, including precombustion cleaning or treatment of fuels.
42 USC § 7411(a)(7)
None identified. Default scope is assumed to be the entire title.