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.
Graph of PCB Aroclors for Investigating Polychlorinated Biphenyl (PCB) Concentrations and Loads in Albuquerque Stormwater Channels project, USGS - New Mexico Water Science Center
Public Domain.
