StacksVerified U.S. regulatory reference

40 CFR Part 53, Table F-3

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov
Idealized DistributionFine Particle ModeCoarse Particle ModePM 2.5/PM 10 RatioFRM Sampler Expected Mass Conc. (µg/m3)
MMD (µm)Geo. Std. Dev.Conc. (µg/m3)MMD (µm)Geo. Std. Dev. | Conc. (µg/m3)
Coarse0.521210 | 2 | 88 | 0.27 | 13.814
“Typical”0.5233.310 | 2 | 66.7 | 0.55 | 34.284
Fine0.8528515 | 2 | 15 | 0.94 | 78.539