1. Regulations
  2. title 40
  3. chapter I-i5
  4. part 53
  5. subpart F
  6. appendix-i 2

- Table F-3 to Subpart F of Part 53—Critical Parameters of Idealized Ambient Particle Size Distributions

Idealized Distribution Fine Particle Mode Coarse Particle Mode PM 2.5/PM 10 Ratio FRM Sampler Expected Mass Conc. (µg/m 3) MMD (µm) Geo. Std. Dev. Conc. (µg/m 3) MMD (µm) Geo. Std. Dev. Conc. (µg/m 3) Coarse0.50212.010288.00.2713.814 “Typical”0.50233.310266.70.5534.284 Fine0.85285.015215.00.9478.539

AUTHORITY: Sec. 301(a) of the Clean Air Act (42 U.S.C. sec. 1857g(a)), as amended by sec. 15(c)(2) of Pub. L. 91-604, 84 Stat. 1713, unless otherwise noted.

SOURCE: 40 FR 7049, Feb. 18, 1975, unless otherwise noted.