---
kind: "section"
citation: "40 C.F.R. § 63.8190"
title: "40"
number: "63.8190"
heading: "What emission limitations must I meet?"
url: "https://uscodex.org/cfr/40/63.8190"
---

# §63.8190. What emission limitations must I meet?

- (a) **Emission limits.** You must meet each emission limit in [paragraphs (a)(1) through (3)](#a-1..a-3) of this section that applies to you.
  - (1) **New or reconstructed mercury cell chlor-alkali production facility.** Emissions of mercury are prohibited from a new or reconstructed mercury cell chlor-alkali production facility.
  - (2) **Existing mercury cell chlor-alkali production facility.** Until the compliance date listed in [§ 63.8186(a)(5)](/cfr/40/63.8186.md?p=a-5), you must comply with [paragraph (a)(2)(i)](#a-2-i) of this section. On and after the compliance date listed in [§ 63.8186(a)(5)](/cfr/40/63.8186.md?p=a-5), you must comply with [paragraph (a)(2)(ii)](#a-2-ii) of this section.
    - (i) During any consecutive 52-week period, you must not discharge to the atmosphere total mercury emissions in excess of the applicable limit in paragraph [(a)(2)(i)(A)](#a-2-i-A) or [(B)](#a-2-i-B) of this section calculated using the procedures in [§ 63.8243(a)](/cfr/40/63.8243.md?p=a).
      - (A) 0.076 grams of mercury per megagram of chlorine produced (1.5 × 10−4 pounds of mercury per ton of chlorine produced) from all by-product hydrogen streams and all end box ventilation system vents when both types of emission points are present.
      - (B) 0.033 grams of mercury per megagram of chlorine produced (6.59 × 10−5 pounds of mercury per ton of chlorine produced) from all by-product hydrogen streams when end box ventilation systems are not present.
    - (ii) **Emissions of mercury are prohibited from an existing mercury cell chlor-alkali production facility.**
  - (3) **New, reconstructed, or existing mercury recovery facility.** You must not discharge to the atmosphere mercury emissions in excess of the applicable limit in paragraph [(a)(3)(i)](#a-3-i) or [(ii)](#a-3-ii) of this section.
    - (i) 23 milligrams per dry standard cubic meter from each oven type mercury thermal recovery unit vent.
    - (ii) 4 milligrams per dry standard cubic meter from each non-oven type mercury thermal recovery unit vent.
- (b) [Reserved]

## Notes

### Amendments

[68 FR 70928, Dec. 19, 2003, as amended at 87 FR 27019, May 6, 2022]

### 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.

### Amendments

[68 FR 70928, Dec. 19, 2003, as amended at 87 FR 27019, May 6, 2022]