Air Toxics Notebook
Chemical Mfg.: Chromium Compounds -  Subpart NNNNNN

Applicability: eCFR Subpart NNNNNN []

Applies to area sources* of HAP that produce chromium compounds, principally sodium dichromate, chromic acid, and chromic oxide, from chromite ore.

*An area source of HAP has the potential to emit <10 tons per year (tpy) of a single HAP or <25 tpy of a combination of HAPs.
Rules apply to small, area sources? Yes
Known Sources in NDEQ Jurisdiction:

Date of Original Final Rule: 7/16/07
Amendments Dates: 03/26/2008 - Direct Final Rule
07/16/2007 - Final Rule
State Regulations (Title 129): Title 129, Chapter 28, Section 001.98. Sources are also responsible for ensuring they are in compliance with current federal requirements found for this subpart in the CFR.
Federal Regulations: 40 CFR 63.11407
Related Rules:

NESHAP - 40 CFR Part 63

Subpart VVVVVV - Chemical Mfg. - area sources
Subpart BBBBBB - Chemical Preparation
Regulations and Federal Registers:
eCFR Subpart NNNNNN []

(See attached file: 6N - Fed. Reg. 03-26-2008- Direct Final Rule.pdf)

(See attached file: 6N - Fed. Reg. 07-16-2007 - Final Rule.pdf)

SizeFile Name
176 KB 6N - Fed. Reg. 03-26-2008- Direct Final Rule.pdf
426 KB 6N - Fed. Reg. 07-16-2007 - Final Rule.pdf
Important Dates:
FAQs, Fact Sheets, and Rule Summaries: EPA's Area Source Rule Website [] - contains the federal register notices and guidance documents for many of the area source rules
Presentations, Training and Articles:
Other Information and Resources:
Page Last Updated: 7/24/18