Fig. 3.
Correlation between total PAHs and benzo[a]pyrene (BaP) and levoglucosan, respectively (a), and between total PAHs and syringaldehyde and acetosyringone (b), respectively
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.