40 CFR Part 53, Table F-3
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Idealized Distribution | Fine Particle Mode | Coarse Particle Mode | PM 2.5/PM 10 Ratio | FRM Sampler Expected Mass Conc. (µg/m3) |
|---|---|---|---|---|
| MMD (µm) | Geo. Std. Dev. | Conc. (µg/m3) | MMD (µm) | Geo. Std. Dev. | Conc. (µg/m3) |
| Coarse | 0.5 | 2 | 12 | 10 | 2 | 88 | 0.27 | 13.814 |
| “Typical” | 0.5 | 2 | 33.3 | 10 | 2 | 66.7 | 0.55 | 34.284 |
| Fine | 0.85 | 2 | 85 | 15 | 2 | 15 | 0.94 | 78.539 |