### Question
How is the term reasonable further progress defined?


### Answer
The term **reasonable further progress** is defined in *42 U.S.C. § 7501* as the following:

> such annual incremental reductions in emissions of the relevant air pollutant as are required by this part or may reasonably be required by the Administrator for the purpose of ensuring attainment of the applicable national ambient air quality standard by the applicable date

#### Citation:
  - *42 U.S.C. § 7501*
  - Heading: **CHAPTER 83-ENERGY EXTENSION SERVICE > SUBCHAPTER I-PROGRAMS AND ACTIVITIES > Part D-Plan Requirements for Nonattainment Areas > subpart 1-nonattainment areas in general**

