### Question
What does stationary source mean?


### Answer
**Stationary source** has the following meaning in *40 CFR § 52.01*:

> any building, structure, facility, or installation which emits or may emit an air pollutant for which a national standard is in effect.

#### Citation:
  - *40 CFR § 52.01*
  - Heading: **PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS > Subpart A—General Provisions > SUBCHAPTER C—AIR PROGRAMS—(CONTINUED) > SUBCHAPTER C—AIR PROGRAMS—(CONTINUED)**

