{"abstract":"This rule consists of three parts. First, the Environmental Protection Agency (EPA) is adopting minimum maintenance intervals for replenishment of consumable chemical reductant (commonly known as diesel exhaust fluid, or DEF) in connection with the use of selective catalytic reduction (SCR) technologies. Second, EPA is adopting provisions allowing manufacturers of nonroad engines to give operators the means to obtain short-term relief from emission controls while operating in emergency situations, such as those where operation of a nonroad engine or equipment is needed to protect human life, and where obtaining short-term relief from emission controls enables such operation. Third, EPA is adopting minor revisions to the direct final rule for emergency vehicles that became effective August 7, 2012, in response to comments received on the parallel Notice of Proposed Rulemaking.","action":"Final rule.","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/2014/08/08/2014-18738.html","cfr_references":[{"chapter":null,"citation_url":null,"part":86,"title":40},{"chapter":null,"citation_url":null,"part":1039,"title":40}],"citation":"79 FR 46356","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This rule is effective on September 8, 2014.","disposition_notes":null,"docket_ids":["EPA-HQ-OAR-2011-1032","FRL-9914-63-OAR"],"dockets":[],"document_number":"2014-18738","effective_on":"2014-09-08","end_page":46375,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2014/08/08/2014-18738.xml","html_url":"https://www.federalregister.gov/documents/2014/08/08/2014-18738/emergency-vehicle-rule-scr-maintenance-and-regulatory-flexibility-for-nonroad-equipment","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2014-18738?publication_date=2014-08-08","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2014-08-08/2014-18738/mods.xml","not_received_for_publication":null,"page_length":20,"page_views":{"count":5734,"last_updated":"2026-07-25 22:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2014-08-08/pdf/2014-18738.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2014-18738.pdf?1407415720","publication_date":"2014-08-08","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2014/08/08/2014-18738.txt","regulation_id_number_info":{"2060-AR46":{"issue":"201404","html_url":"https://www.federalregister.gov/regulations/2060-AR46/heavy-duty-highway-program-revisions-for-emergency-vehicles-and-scr-maintenance","title":"Heavy-Duty Highway Program: Revisions for Emergency Vehicles and SCR Maintenance","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=201404&RIN=2060-AR46&operation=OPERATION_EXPORT_XML","priority_category":"Substantive, Nonsignificant"}},"regulation_id_numbers":["2060-AR46"],"regulations_dot_gov_info":{"supporting_documents":[{"title":"Email from VW to USEPA","document_id":"EPA-HQ-OAR-2011-1032-0065"},{"title":"Matt Spears Memorandum re External Meetings 07 30 2014","document_id":"EPA-HQ-OAR-2011-1032-0064"},{"title":"Docket Memo from William Charmley","document_id":"EPA-HQ-OAR-2011-1032-0063"},{"title":"Summary and Analysis of Comments [EPA-420-R-14-001]","document_id":"EPA-HQ-OAR-2011-1032-0062"},{"title":"Integer Monitor Issue 21 April 2013","document_id":"EPA-HQ-OAR-2011-1032-0061"},{"title":"Integer information on DEF","document_id":"EPA-HQ-OAR-2011-1032-0060"},{"title":"Emergency vehicle discussion with GSA","document_id":"EPA-HQ-OAR-2011-1032-0059"},{"title":"Email on Revised Definitions of Emergency Vehicle and Emergency Equipment","document_id":"EPA-HQ-OAR-2011-1032-0058"},{"title":"Email on Cummins-powered airport emergency vehicles","document_id":"EPA-HQ-OAR-2011-1032-0057"},{"title":"Email from Forest Service on Fire Dozers","document_id":"EPA-HQ-OAR-2011-1032-0056"}],"comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=EPA-HQ-OAR-2011-1032","supporting_documents_count":44,"docket_id":"EPA-HQ-OAR-2011-1032","regulation_id_number":"2060-AR54","title":"Heavy-Duty Highway Program: Revisions for Emergency Vehicles and SCR Maintenance","checked_regulationsdotgov_at":"2014-08-28T06:00:12Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":46356,"subtype":null,"title":"Emergency Vehicle Rule-SCR Maintenance and Regulatory Flexibility for Nonroad Equipment","toc_doc":"SCR Maintenance and Regulatory Flexibility for Nonroad Equipment","toc_subject":"Emergency Vehicles:","topics":["Administrative practice and procedure","Air pollution control","Confidential business information","Environmental protection","Imports","Labeling","Motor vehicle pollution","Penalties","Reporting and recordkeeping requirements","Warranties"],"type":"Rule","volume":79}