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.
Percentage dust deposition in the respiratory tract according to particle diameter. The major alveolar impact is that of particles 1–3 µm diameter. Submicron particles are of negligible mass. T, total dust deposition; C, deposition on the ciliated epithelium; A, alveolar deposition.
