Figure 2.
Interpolation map of mercury concentrations in four media in Shanghai, (a) soil, (b) foliar dust, (c) camphor tree leaves, and (d) dust. R: rural area (R1–R9); S: suburban industrial area (S1–S9); U: urban area (U1–U14).
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.