Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Breathing zone number concentrations by seam responsibility
| Group | Worker ID | GM (particles cm−3) | GSD | Duncan Grouping Levels* |
|---|---|---|---|---|
| Long | 4, 5, 9 | 383,000 | 1.48 | A, B |
| Middle | 6, 7 | 688,000 | 1.24 | A |
| Short | 2, 8 | 192,000 | 1.44 | B |
| Mixture | 1, 3, | 245,000 | 1.03 | B |
Means with the same letter are not statistically different.
