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Federal Register / Vol. 86, No. 28 / Friday, February 12, 2021 / Proposed Rules leave in place the basic framework of the SEF
rules as originally adopted by the Commission. This framework has enhanced market transparency, improved competition, lowered transaction costs, and resulted in better swap prices for end users. While it may be appropriate to make other incremental changes going forward, it is important that we affirm the established regulatory program for SEFs to maintain these benefits and facilitate further expansion of this framework.
I thank the staff of the Division of Market Oversight for their work on these two rules and their helpful engagement with my office.
FR Doc. 202028945 Filed 21121; 8:45 am BILLING CODE 635101P

ENVIRONMENTAL PROTECTION
AGENCY
40 CFR Part 52
EPAR05OAR20200542; FRL10017
35Region 5

Air Plan Approval; Illinois; Volatile Organic Material Definition Update Environmental Protection Agency EPA.
ACTION: Proposed rule.
AGENCY:

The Environmental Protection Agency EPA is proposing to approve a revision to the Illinois State Implementation Plan SIP. The revision will amend the Illinois Administrative Code IAC by updating the definition of volatile organic material VOM and volatile organic compounds VOC to exclude Z-1,1,1,4,4,4-hexafluorobut-2ene. This revision is consistent with an EPA rulemaking in 2018, which exempted this compound from the Federal definition of VOC on the basis that the compound makes a negligible contribution to tropospheric ozone formation.

SUMMARY:

Comments must be received on or before March 15, 2021.
ADDRESSES: Submit your comments, identified by Docket ID No. EPAR05
OAR20200542 at http
www.regulations.gov, or via email to aburano.douglas@epa.gov. For comments submitted at Regulations.gov, follow the online instructions for submitting comments. Once submitted, comments cannot be edited or removed from Regulations.gov. For either manner of submission, EPA may publish any comment received to its public docket.
Do not submit electronically any information you consider to be Confidential Business Information CBI
or other information whose disclosure is restricted by statute. Multimedia submissions audio, video, etc. must be DATES:

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accompanied by a written comment.
The written comment is considered the official comment and should include discussion of all points you wish to make. EPA will generally not consider comments or comment contents located outside of the primary submission i.e., on the web, cloud, or other file sharing system. For additional submission methods, please contact the person identified in the FOR FURTHER
INFORMATION CONTACT section. For the full EPA public comment policy, information about CBI or multimedia submissions, and general guidance on making effective comments, please visit http www2.epa.gov/dockets/
commenting-epa-dockets.
FOR FURTHER INFORMATION CONTACT:
Andrew Lee, Physical Scientist, Attainment Planning and Maintenance Section, Air Programs Branch AR18J, Environmental Protection Agency, Region 5, 77 West Jackson Boulevard, Chicago, Illinois 60604, 312 3537645, lee.andrew.c@epa.gov. The EPA Region 5 office is open from 8:30 a.m. to 4:30
p.m., Monday through Friday, excluding Federal holidays and facility closures due to COVID19.
SUPPLEMENTARY INFORMATION:
Throughout this document whenever we, us, or our is used, we mean EPA.
I. Background Information Tropospheric ozone, commonly known as smog, is formed when VOC
and nitrogen oxides NOX react in the atmosphere in the presence of sunlight.
Because of the harmful effects of ozone, EPA and state governments implement rules to limit the amount of certain VOC
and NOX that can be released into the atmosphere. VOC are those compounds of carbon excluding carbon monoxide, carbon dioxide, carbonic acid, metallic carbides or carbonates, and ammonium carbonate that form ozone through atmospheric photochemical reactions.
VOC have different levels of reactivity;
they do not react at the same speed or form ozone to the same extent.
The Clean Air Act CAA requires the regulation of VOC for various purposes.
Section 302s of the CAA specifies that EPA has the authority to define the meaning of VOC, and hence, what compounds shall be treated as VOC for regulatory purposes. EPAs longstanding policy is that compounds of carbon with negligible reactivity need not be regulated to reduce ozone and should be exempted from the regulatory definition of VOC. See 42 FR 35314 July 8, 1977, 70 FR 54046 Sept. 13, 2005.
EPA uses the reactivity of ethane as the threshold for determining whether a
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compound makes a negligible contribution to tropospheric ozone formation. Compounds that are less reactive than, or equally reactive to, ethane under certain assumed conditions may be deemed negligibly reactive and, therefore, suitable for exemption by EPA from the regulatory definition of VOC. EPA lists compounds it has determined to be negligibly reactive, and thus excluded from the regulatory definition of VOC, in 40 CFR
51.100s.
On November 28, 2018, EPA added cis-1,1,1,4,4,4-hexafluorobut-2-ene also known as HFO1336mzz-Z; Chemical Abstract Service CAS RN 692499, a hydrofluoroolefin, to the list of compounds excluded from the regulatory definition of VOC because it makes a negligible contribution to ground-level ozone formation. See 83
FR 61127.
II. The Illinois Submittal On October 20, 2020, the Illinois Environmental Protection Agency IEPA submitted amendments to 35 IAC
211.7150 Volatile Organic Material VOM or Volatile Organic Compound VOC for approval as revisions to the Illinois SIP. Illinois SIP currently includes a definition of VOM at 35 IAC
211.7150. See 81 FR 95475 Dec. 28, 2016. Subsection a of 35 IAC 211.7150
includes a list of compounds excluded from the regulatory definition of VOC, which reflect some of the compounds EPA has excluded in 40 CFR 51.100s, on the basis that they make a negligible contribution to tropospheric ozone formation.
The proposed SIP revision updates the compounds excluded from the definition of VOM to conform to EPAs recent exemption of a chemical compound from regulations of ozone precursors. Specifically, the SIP revision excludes Z-1,1,1,4,4,4-hexafluorobut2-ene from the definition of VOM or VOC at 35 IAC 211.7150. Illinois uses the International Union of Pure and Applied Chemistry IUPAC preferred name of Z-1,1,1,4,4,4-hexafluorobut-2ene instead of cis-1,1,1,4,4,4hexafluorobut-2-ene when addressing the compound. These changes do not interfere with the Federal listing of excluded compounds, and provide more specific chemical composition, structural, and isomeric identification information. Illinois also lists the compound by its other identifiers: HFO
1336mzzZ and CAS No. 692499.
The Illinois Pollution Control Board IPCB held a public hearing on the proposed SIP revision on July 16, 2020.
IPCB received three comments at the public hearing that resulted in no
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