{"abstract":"Through this supplemental notice of proposed rulemaking (\"supplemental proposal\" or \"SNPRM\"), the Environmental Protection Agency (EPA) is seeking public comment on the Agency's additional and clarified technical rationale related to the proposed approval of Tennessee's February 26, 2020, state implementation plan (SIP) revisions requesting the removal of Tennessee's motor vehicle inspection and maintenance (I/M) program requirements for Davidson, Sumner, Rutherford, Williamson, and Wilson Counties in Tennessee (also known as the Middle Tennessee Area) and Hamilton County (also known as the Chattanooga Area), from the federally-approved SIP. Specifically, EPA proposes to affirm that the Hamilton County and Middle Tennessee areas would continue to attain and maintain the national ambient air quality standards (NAAQS or standards) after removal of the I/M program, and to rely on an emissions inventory comparison to inform its determination that both areas would continue to attain and maintain the ozone and carbon monoxide (CO) NAAQS. EPA is further proposing to conclude that the removal of the I/M program will not interfere with other states' ability to attain and maintain the 2008 ozone NAAQS under the good neighbor provision of the Clean Air Act (CAA or Act) and providing additional information related to that conclusion. EPA is now taking comment on the use of this comparison and additional information in this supplemental proposal.","action":"Supplemental notice of proposed rulemaking.","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/2021/04/22/2021-08320.html","cfr_references":[{"chapter":null,"citation_url":null,"part":52,"title":40}],"citation":"86 FR 21248","comment_url":null,"comments_close_on":"2021-05-24","correction_of":null,"corrections":[],"dates":"Written comments must be received on or before May 24, 2021.","disposition_notes":null,"docket_ids":["EPA-R04-OAR-2019-0618 and EPA-R04-OAR-2019-0619","FRL-10022-87-Region 4"],"dockets":[{"supporting_documents":[{"title":"Opus Letter to EPA Requesting a Meeting","document_id":"EPA-R04-OAR-2019-0618-0183"},{"title":"TN_IM Meeting with Opus_Letter Final -1","document_id":"EPA-R04-OAR-2019-0618-0182"},{"title":"Figure 1 - TN IM Final","document_id":"EPA-R04-OAR-2019-0618-0181"},{"title":"ozone_design_values_contributions_proposed_revised_csapr_update (2023 Modeling Results)","document_id":"EPA-R04-OAR-2019-0618-0172"},{"title":"MOVES modeling note for FR","document_id":"EPA-R04-OAR-2019-0618-0170"},{"title":"APC MMC Memo to MWO RE 2030 Onroad Emissions Estimates for Board","document_id":"EPA-R04-OAR-2019-0618-0169"},{"title":"TN IM Memo Final signed 1-14-21","document_id":"EPA-R04-OAR-2019-0618-0168"},{"title":"State-of-the-Air_2018-Report (002)","document_id":"EPA-R04-OAR-2019-0618-0167"},{"title":"sota-2019-full","document_id":"EPA-R04-OAR-2019-0618-0165"},{"title":"IM_Removal_Final_110(l)_Middle_TN_2-26-2020_0","document_id":"EPA-R04-OAR-2019-0618-0164"}],"agency_name":"EPA","documents":[{"comment_count":8,"comment_start_date":"2021-04-22","updated_at":"2023-02-28T20:28:11.275-05:00","comment_url":"https://www.regulations.gov/commenton/EPA-R04-OAR-2019-0618-0171","allow_late_comments":null,"id":"EPA-R04-OAR-2019-0618-0171","comment_end_date":"2021-05-25","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":12,"id":"EPA-R04-OAR-2019-0618","title":"TN; Middle TN I/M removal 110(l)"}],"document_number":"2021-08320","effective_on":null,"end_page":21254,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2021/04/22/2021-08320.xml","html_url":"https://www.federalregister.gov/documents/2021/04/22/2021-08320/air-plan-approval-tn-removal-of-vehicle-im-program-middle-tennessee-area-and-hamilton-county","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2021-08320?publication_date=2021-04-22","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2021-04-22/2021-08320/mods.xml","not_received_for_publication":null,"page_length":7,"page_views":{"count":771,"last_updated":"2026-04-04 18:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2021-04-22/pdf/2021-08320.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2021-08320.pdf?1619009129","publication_date":"2021-04-22","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2021/04/22/2021-08320.txt","regulation_id_number_info":{},"regulation_id_numbers":[],"regulations_dot_gov_info":{"supporting_documents":[{"title":"Opus Letter to EPA Requesting a Meeting","document_id":"EPA-R04-OAR-2019-0618-0183"},{"title":"TN_IM Meeting with Opus_Letter Final -1","document_id":"EPA-R04-OAR-2019-0618-0182"},{"title":"Figure 1 - TN IM Final","document_id":"EPA-R04-OAR-2019-0618-0181"},{"title":"ozone_design_values_contributions_proposed_revised_csapr_update (2023 Modeling Results)","document_id":"EPA-R04-OAR-2019-0618-0172"},{"title":"MOVES modeling note for FR","document_id":"EPA-R04-OAR-2019-0618-0170"},{"title":"APC MMC Memo to MWO RE 2030 Onroad Emissions Estimates for Board","document_id":"EPA-R04-OAR-2019-0618-0169"},{"title":"TN IM Memo Final signed 1-14-21","document_id":"EPA-R04-OAR-2019-0618-0168"},{"title":"State-of-the-Air_2018-Report (002)","document_id":"EPA-R04-OAR-2019-0618-0167"},{"title":"sota-2019-full","document_id":"EPA-R04-OAR-2019-0618-0165"},{"title":"IM_Removal_Final_110(l)_Middle_TN_2-26-2020_0","document_id":"EPA-R04-OAR-2019-0618-0164"}],"comments_count":8,"agency_id":"EPA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=EPA-R04-OAR-2019-0618","supporting_documents_count":12,"docket_id":"EPA-R04-OAR-2019-0618","document_id":"EPA-R04-OAR-2019-0618-0171","regulation_id_number":null,"title":"TN; Middle TN I/M removal 110(l)","checked_regulationsdotgov_at":"2023-03-01T01:28:09Z"},"regulations_dot_gov_url":null,"significant":null,"signing_date":null,"start_page":21248,"subtype":null,"title":"Air Plan Approval; TN; Removal of Vehicle I/M Program; Middle Tennessee Area and Hamilton County","toc_doc":"Tennessee; Removal of Vehicle I/M Program; Middle Tennessee Area and Hamilton County","toc_subject":"Air Quality State Implementation Plans; Approvals and Promulgations:\n","topics":["Air pollution control","Carbon monoxide","Environmental protection","Incorporation by reference","Intergovernmental relations","Lead","Nitrogen dioxide","Ozone","Particulate matter","Reporting and recordkeeping requirements","Sulfur oxides","Volatile organic compounds"],"type":"Proposed Rule","volume":86}