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.
Collection efficiency by size of the impaction stage. Open symbols represent SMPS data; closed symbols represent APS data. Particle diameter is the mobility equivalent diameter. APS particle size intervals were converted to mobility equivalent diameter following Peters et al.(21)
