---
kind: "section"
citation: "40 C.F.R. § 63.9280"
title: "40"
number: "63.9280"
heading: "What is the purpose of subpart PPPPP?"
url: "https://uscodex.org/cfr/40/63.9280"
---

# §63.9280. What is the purpose of subpart PPPPP?


This subpart PPPPP establishes national emission standards for hazardous air pollutants (NESHAP) for engine test cells/stands located at major sources of hazardous air pollutants (HAP) emissions. This subpart also establishes requirements to demonstrate initial and continuous compliance with the emission limitations contained in this NESHAP.


## Notes

### Source

Source: 68 FR 28785, May 27, 2003, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.