{"abstract":"Notice is hereby given that the Environmental Protection Agency (EPA) has designated one new equivalent method for measuring SO<INF>2</INF>, one new reference method for measuring NO<INF>2</INF>, one new equivalent method for measuring concentrations of PM<INF>2.5</INF>, and one new equivalent method for measuring PM<INF>10-2.5</INF> in ambient air.","action":"Notice of the designation of three new equivalent methods and one new reference method for monitoring ambient air quality.","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/2025/09/05/2025-17079.html","cfr_references":[],"citation":"90 FR 42965","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":null,"disposition_notes":null,"docket_ids":["FRL-12714-01-ORD"],"dockets":[{"supporting_documents":[{"title":"Adequacy Status of the Cleveland/Akron, Ohio and the Columbus, Ohio Submitted 8-Hour Ozone Redesignation and Maintenance Plans for Transportation Conformity Purposes","document_id":"EPA_FRDOC_0001-6733"},{"title":"DELETE","document_id":"EPA_FRDOC_0001-6642"},{"title":"Agency Information Collection Activities; 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