---
kind: "section"
citation: "40 C.F.R. § 63.9881"
title: "40"
number: "63.9881"
heading: "Am I subject to this subpart?"
url: "https://uscodex.org/cfr/40/63.9881"
---

# §63.9881. Am I subject to this subpart?


You are subject to this subpart if you own or operate a primary magnesium refinery that is (or is part of) a major source of hazardous air pollutant (HAP) emissions. Your primary magnesium refinery is a major source of HAP if it emits or has the potential to emit any single HAP at a rate of 10 tons or more per year or any combination of HAP at a rate of 25 tons or more per year.


## Notes

### Source

Source: 68 FR 58620, Oct. 10, 2003, unless otherwise noted.

### Authority

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

### Source

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