{"abstract":"This NPRM proposes to make several revisions to EPA's mobile source emission programs and test procedures. EPA believes that each of these is minor and non-controversial in nature. Most of the proposed changes arise from the results of the collaborative test program and related technical work we conducted for the highway heavy-duty diesel in-use testing program. Most noteworthy here is the proposal to adopt a particulate matter measurement allowance for use with portable emission measurement systems. Related to this are two provisions to align the in-use program timing requirements with completion of the program as required in current regulations and the incorporation of revisions to a few technical requirements in the testing regulations based on information learned in this and one other test program. Finally, the NPRM proposes to modify a few transitional flexibilities for locomotive, recreational marine, and Tier 4 nonroad engines and incorporates a handful of minor corrections.","action":"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/2010/11/08/2010-27894.html","cfr_references":[{"chapter":null,"citation_url":null,"part":86,"title":40},{"chapter":null,"citation_url":null,"part":1033,"title":40},{"chapter":null,"citation_url":null,"part":1039,"title":40},{"chapter":null,"citation_url":null,"part":1042,"title":40},{"chapter":null,"citation_url":null,"part":1045,"title":40},{"chapter":null,"citation_url":null,"part":1054,"title":40},{"chapter":null,"citation_url":null,"part":1065,"title":40}],"citation":"75 FR 68575","comment_url":null,"comments_close_on":"2010-12-08","correction_of":null,"corrections":[],"dates":"Written comments must be received by December 8, 2010. Request for a public hearing must be received by November 23, 2010. If we receive a request for a public hearing, we will publish information related to the timing and location of the hearing and the timing of a new deadline for public comments.","disposition_notes":null,"docket_ids":["EPA-HQ-OAR-2010-0142","FRL-9220-7"],"dockets":[],"document_number":"2010-27894","effective_on":null,"end_page":68582,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2010/11/08/2010-27894.xml","html_url":"https://www.federalregister.gov/documents/2010/11/08/2010-27894/revisions-to-in-use-testing-for-heavy-duty-diesel-engines-and-vehicles-emissions-measurement-and","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2010-27894?publication_date=2010-11-08","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2010-11-08/2010-27894/mods.xml","not_received_for_publication":null,"page_length":8,"page_views":{"count":351,"last_updated":"2026-04-04 18:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2010-11-08/pdf/2010-27894.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"2010-11-08","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2010/11/08/2010-27894.txt","regulation_id_number_info":{"2060-AO69":{"issue":"200710","html_url":"https://www.federalregister.gov/regulations/2060-AO69/in-use-testing-for-heavy-duty-diesel-engines-and-vehicles","title":"In-Use Testing for Heavy-Duty Diesel Engines and Vehicles","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=200710&RIN=2060-AO69&operation=OPERATION_EXPORT_XML","priority_category":"Substantive, Nonsignificant"}},"regulation_id_numbers":["2060-AO69"],"regulations_dot_gov_info":{"checked_regulationsdotgov_at":"2010-12-05T17:33:50Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":68575,"subtype":null,"title":"Revisions To In-Use Testing for Heavy-Duty Diesel Engines and Vehicles; Emissions Measurement and Instrumentation; Not-to-Exceed Emission Standards; and Technical Amendments for Off-Highway Engines","toc_doc":"Emissions Measurement and Instrumentation; Not-to-Exceed Emission Standards; etc.","toc_subject":"Revisions to In-Use Testing for Heavy-Duty Diesel Engines and Vehicles:","topics":["Administrative practice and procedure","Air pollution control","Confidential business information","Environmental protection","Imports","Incorporation by reference","Labeling","Motor vehicle pollution","Penalties","Railroads","Reporting and recordkeeping requirements","Research","Vessels","Warranties"],"type":"Proposed Rule","volume":75}