### Question
How is the "startup" defined?


### Answer
The term **startup** is defined in *40 CFR § 52.01* as follows -

> the setting in operation of a source for any purpose.

#### 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)**

