{"data":{"id":"us/40-cfr-table-f-3-to-subpart-f-of-part-53","jurisdiction":"us","citation":"40 CFR Table F-3 to Subpart F of Part 53","heading":"Table F-3 to Subpart F of Part 53—Critical Parameters of Idealized Ambient Particle Size Distributions","body":"Idealized Distribution Fine Particle Mode Coarse Particle Mode PM 2.5/PM 10 Ratio FRM Sampler Expected Mass Conc. (µg/m3)\nMMD (µm) Geo. Std. Dev. Conc. (µg/m3) MMD (µm) Geo. Std. Dev. Conc. (µg/m3)\nCoarse 0.50 2 12.0 10 2 88.0 0.27 13.814\n“Typical” 0.50 2 33.3 10 2 66.7 0.55 34.284\nFine 0.85 2 85.0 15 2 15.0 0.94 78.539","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 53—AMBIENT AIR MONITORING REFERENCE AND EQUIVALENT METHODS","Subpart F—Procedures for Testing Performance Characteristics of Class II Equivalent Methods for PM 2.5"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"58a1f5ddce9201ecbd12d63b62db842cc2fa15948a30e4709d5d7322809d8a45","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-table-f-2-to-subpart-f-of-part-53","next":"us/40-cfr-table-f-4-to-subpart-f-of-part-53"},"notice":"GroundRules: Original legal text. Not legal advice."}