Figure 1. Environmental Protection Agency Regulatory Monitor Coverage by Criteria Pollutant.
Spatial coverage of the US is shown for each monitor by criteria pollutant.
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.