---
kind: "section"
citation: "40 C.F.R. § 63.7181"
title: "40"
number: "63.7181"
heading: "Am I subject to this subpart?"
url: "https://uscodex.org/cfr/40/63.7181"
---

# §63.7181. Am I subject to this subpart?

- (a) You are subject to this subpart if you own or operate a semiconductor manufacturing process unit that is a major source of hazardous air pollutants (HAP) emissions or that is located at, or is part of, a major source of HAP emissions.
- (b) A major source of HAP emissions is any stationary source or group of stationary sources located within a contiguous area and under common control that emits or has the potential to emit, considering controls, in the aggregate, any single HAP at a rate of 10 tons per year (tpy) or more or any combination of HAP at a rate of 25 tpy or more.

## Notes

### Source

Source: 68 FR 27925, May 22, 2003, unless otherwise noted.

### Authority

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

### Source

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