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.
Chemical concentrations in the chamber air (ng m−3) for different sets of experiments (a) styrene, (b) 2-methyl 2-cyclopenten-1-one, (c) naphthalene, (d) triacetin and (e) nicotine. For experiment #1, #9, and #10, cigarette butts were taken out at 25.4 h, 28.4 h, and 27.6 h, respectively
