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.
Example of a map of Goddard Earth Observing System Composition Forecast forecasted PM2.5 as seen on the CDC Tracking Network's publicly available Data Explorer. On this day, 6 June 2023, heavy smoke from Canadian wildfires impacted major population centers in the eastern U.S.
