---
kind: "section"
citation: "40 C.F.R. § 63.8240"
title: "40"
number: "63.8240"
heading: "What are my monitoring requirements?"
url: "https://uscodex.org/cfr/40/63.8240"
---

# §63.8240. What are my monitoring requirements?


For each by-product hydrogen stream, each end box ventilation system vent, and each mercury thermal recovery unit vent, you must monitor the mercury emissions using the procedures in paragraph [(a)](#a) or [(b)](#b) of this section.

- (a) You must continuously monitor the mercury concentration using a mercury continuous emissions monitor according to the requirements in §§ [63.8242(a)](/cfr/40/63.8242.md?p=a) and [63.8244(a)](/cfr/40/63.8244.md?p=a); or
- (b) You must periodically monitor the mercury emissions according to the requirements in §§ [63.8242(b)](/cfr/40/63.8242.md?p=b) and [63.8244(b)](/cfr/40/63.8244.md?p=b).

## Notes

### Source

Source: 68 FR 70928, Dec. 19, 2003, unless otherwise noted.

### Authority

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

### Source

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