Fig. 6.
The impact of removal of lead from gasoline—a data linkage display (Pirkle et al. 1994)
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.