[Federal Register Volume 89, Number 32 (Thursday, February 15, 2024)]
[Notices]
[Pages 11831-11832]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2024-02935]


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ENVIRONMENTAL PROTECTION AGENCY

[EPA-HQ-OAR-2023-0642; FRL: 11720-01-OAR]


Notice of Opportunity To Comment on Proposed Update of PM2.5 Data 
From T640/T640X PM Mass Monitors

AGENCY: Environmental Protection Agency (EPA).

ACTION: Notice.

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SUMMARY: The Environmental Protection Agency (EPA) is requesting 
comment on its plan to retroactively apply the approved modification of 
the Federal Equivalent Method (FEM) designation for the Teledyne 
Advanced Pollution Instrumentation Model T640 particulate matter (PM) 
mass monitor including the 640X option (hereafter T640 and T640X) to 
all of the PM with a diameter 2.5 micrometers or smaller 
(PM2.5) concentration data from the T640 and

[[Page 11832]]

T640X monitors in the EPA's Air Quality System (AQS) that was reported 
prior to the modification. This update, which will be applied to the 
unmodified hourly PM2.5 concentration data in AQS using 
collocated ambient temperature when available, is expected to result in 
a much higher number of PM2.5 monitoring sites using the 
T640 and T640X FEM methods meeting the bias measurement quality 
objectives (MQOs). More details related to this update can be found in 
the document titled, ``Proposal to Update PM2.5 Data from 
T640/T640X PM Mass Monitors,'' located in the docket for this action 
and on the EPA's website at https://www.epa.gov/aqs/aqs-memos-monitoring-and-policy. Because of the importance of this air quality 
data for regulatory, scientific, and public use, the EPA is providing 
an opportunity for the public to comment on this update and the 
subsequent use of the updated data in regulatory and non-regulatory 
applications.

DATES: Comments must be received on or before March 15, 2024.

ADDRESSES: You may send comments, identified by Docket ID No. EPA-HQ-
OAR-2023-0642, by any of the following methods:
     Federal eRulemaking Portal: https://www.regulations.gov/ 
(our preferred method). Follow the online instructions for submitting 
comments.
     Email: [email protected]. Include Docket ID No. EPA-
HQ-OAR-2023-0642 in the subject line of the message.
     Mail: U.S. Environmental Protection Agency, EPA Docket 
Center, OAQPS Docket, Mail Code 28221T, 1200 Pennsylvania Avenue NW, 
Washington, DC 20460.
     Hand Delivery or Courier (by appointment only): EPA Docket 
Center, WJC West Building, Room 3334, 1301 Constitution Avenue NW, 
Washington, DC 20004. The Docket Center's hours of operations are 8:30 
a.m.-4:30 p.m., Monday-Friday (except Federal Holidays).
    Instructions: All submissions received must include the Docket ID 
No. for this rulemaking. Comments received may be posted without change 
to https://www.regulations.gov, including any personal information 
provided. For detailed instructions on sending comments and additional 
information on the rulemaking process, see the ``Public Participation'' 
heading of the SUPPLEMENTARY INFORMATION section of this document.

FOR FURTHER INFORMATION CONTACT: Brett Gantt, Office of Air Quality 
Planning and Standards, Air Quality Assessment Division, Air Quality 
Analysis Group (Mail Code: C304-04), Environmental Protection Agency, 
109 T.W. Alexander Drive, Research Triangle Park, NC 27711; telephone 
number: (919) 541-5274; email address [email protected].

SUPPLEMENTARY INFORMATION:

I. Proposed Data Correction

    For detailed information regarding the retroactive correction of 
air quality data and the use of corrected data, please see the document 
titled, ``Proposal to Update PM2.5 Data from T640/T640X PM 
Mass Monitors,'' located in the docket for this action and on the EPA's 
website at https://www.epa.gov/aqs/aqs-memos-monitoring-and-policy.
    The EPA seeks comment on this document, including the proposed 
timing for the data correction and how the EPA and other monitoring 
authorities may use the data once corrected. The EPA will consider 
comments received prior to making a final determination on the 
retroactive application of the approved modification to the FEM for the 
Teledyne T640/T640X monitoring data.

II. Public Participation

A. Written Comments

    Submit your comments, identified by Docket ID No. EPA-HQ-OAR-2023-
0642, at https://www.regulations.gov (our preferred method), or using 
one of the other methods identified in the ADDRESSES section. Once 
submitted, comments cannot be edited or removed from the docket. The 
EPA may publish any comment received to its public docket. Do not 
submit to the docket at https://www.regulations.gov any information you 
consider to be Confidential Business Information (CBI), Proprietary 
Business Information (PBI), or other information whose disclosure is 
restricted by statute. Multimedia submissions (audio, video, etc.) must 
be accompanied by a written comment. The written comment is considered 
the official comment and should include discussion of all points you 
wish to make. The 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). Please visit https://www.epa.gov/dockets/commenting-epa-dockets for additional submission methods; the 
full EPA public comment policy; information about CBI, PBI, or 
multimedia submissions; and general guidance on making effective 
comments.

Richard A. Wayland,
Director, Air Quality Assessment Division.
[FR Doc. 2024-02935 Filed 2-14-24; 8:45 am]
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