### Question
How is the term qualifying phase I technology defined?


### Answer
The term **qualifying phase I technology** is defined in *42 U.S.C. § 7651a* as the following:

> a technological system of continuous emission reduction which achieves a 90 percent reduction in emissions of sulfur dioxide from the emissions that would have resulted from the use of fuels which were not subject to treatment prior to combustion

#### Citation:
  - *42 U.S.C. § 7651a*
  - Heading: **SUBCHAPTER I-PROGRAMS AND ACTIVITIES > Codification**

