{"abstract":"The Environmental Protection Agency (EPA) is retroactively applying 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 concentration data for PM with a diameter 2.5 micrometers or smaller (PM<INF>2.5</INF>) from the T640 and T640X monitors in the EPA's Air Quality System (AQS) that was reported prior to the modification. The EPA processed the unmodified hourly PM<INF>2.5</INF> concentration data in AQS using collocated or paired ambient temperature when available.","action":"Notice.","agencies":[{"raw_name":"ENVIRONMENTAL PROTECTION AGENCY","name":"Environmental Protection Agency","id":145,"url":"https://www.federalregister.gov/agencies/environmental-protection-agency","json_url":"https://www.federalregister.gov/api/v1/agencies/145","parent_id":null,"slug":"environmental-protection-agency"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2024/05/16/2024-10750.html","cfr_references":[],"citation":"89 FR 42874","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"Updated data will be available in AQS by May 13, 2024. Although not required, the EPA recommends that air agencies review the updated data by May 28, 2024, and contact their EPA Regional office with any questions.","disposition_notes":null,"docket_ids":["EPA-HQ-OAR-2023-0642","FRL: 11720-02-OAR"],"dockets":[{"supporting_documents":[{"title":"Quick Reference Guide to T640/T640X Data","document_id":"EPA-HQ-OAR-2023-0642-0034"},{"title":"Supplemental Information on the EPA’s Update of PM2.5 Data from T640/T640X PM Mass Monitors (May 2024)","document_id":"EPA-HQ-OAR-2023-0642-0033"},{"title":"Summary of and Responses to Public Comments on the EPA’s Plan to Update PM2.5 Data from T640/T640X PM Mass Monitors","document_id":"EPA-HQ-OAR-2023-0642-0032"},{"title":"TAPI Alignment Factor CBI Release","document_id":"EPA-HQ-OAR-2023-0642-0030"},{"title":"Development of an FRM alignment factor for the Teledyne API T640 and T640x particulate matter monitors","document_id":"EPA-HQ-OAR-2023-0642-0029"},{"title":"Approval of four Modification Requests for the T640-T640x PM FEM monitors","document_id":"EPA-HQ-OAR-2023-0642-0028"},{"title":"Teledyne Data Update NOA Supporting Documentation 2024","document_id":"EPA-HQ-OAR-2023-0642-0002"}],"agency_name":"EPA","documents":[{"comment_count":null,"comment_start_date":null,"updated_at":"2024-05-16T09:57:00.361-04:00","comment_url":"https://www.regulations.gov/commenton/EPA-HQ-OAR-2023-0642-0031","allow_late_comments":null,"id":"EPA-HQ-OAR-2023-0642-0031","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":7,"id":"EPA-HQ-OAR-2023-0642","title":"Update of PM2.5 Data for the T640/T640X PM Mass Monitors"}],"document_number":"2024-10750","effective_on":null,"end_page":42874,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2024/05/16/2024-10750.xml","html_url":"https://www.federalregister.gov/documents/2024/05/16/2024-10750/update-of-pm25-data-from-t640t640x-pm-mass-monitors","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2024-10750?publication_date=2024-05-16","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2024-05-16/2024-10750/mods.xml","not_received_for_publication":null,"page_length":1,"page_views":{"count":472,"last_updated":"2026-05-19 22:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2024-05-16/pdf/2024-10750.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2024-10750.pdf?1715777129","publication_date":"2024-05-16","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2024/05/16/2024-10750.txt","regulation_id_number_info":{},"regulation_id_numbers":[],"regulations_dot_gov_info":{"supporting_documents":[{"title":"Quick Reference Guide to T640/T640X Data","document_id":"EPA-HQ-OAR-2023-0642-0034"},{"title":"Supplemental Information on the EPA’s Update of PM2.5 Data from T640/T640X PM Mass Monitors (May 2024)","document_id":"EPA-HQ-OAR-2023-0642-0033"},{"title":"Summary of and Responses to Public Comments on the EPA’s Plan to Update PM2.5 Data from T640/T640X PM Mass Monitors","document_id":"EPA-HQ-OAR-2023-0642-0032"},{"title":"TAPI Alignment Factor CBI Release","document_id":"EPA-HQ-OAR-2023-0642-0030"},{"title":"Development of an FRM alignment factor for the Teledyne API T640 and T640x particulate matter monitors","document_id":"EPA-HQ-OAR-2023-0642-0029"},{"title":"Approval of four Modification Requests for the T640-T640x PM FEM monitors","document_id":"EPA-HQ-OAR-2023-0642-0028"},{"title":"Teledyne Data Update NOA Supporting Documentation 2024","document_id":"EPA-HQ-OAR-2023-0642-0002"}],"comments_count":0,"agency_id":"EPA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=EPA-HQ-OAR-2023-0642","supporting_documents_count":7,"docket_id":"EPA-HQ-OAR-2023-0642","document_id":"EPA-HQ-OAR-2023-0642-0031","regulation_id_number":null,"title":"Update of PM2.5 Data for the T640/T640X PM Mass Monitors","checked_regulationsdotgov_at":"2024-05-17T12:00:11Z"},"regulations_dot_gov_url":null,"significant":null,"signing_date":null,"start_page":42874,"subtype":null,"title":"Update of PM2.5 Data From T640/T640X PM Mass Monitors","toc_doc":"Update of PM2.5 Data from T640/T640X PM Mass Monitors","toc_subject":null,"topics":[],"type":"Notice","volume":89}