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 the variation in TVOC concentration in a conventional house, and the moving averages. Three golden crosses, points I–III are apparent. However, cross points I and II are only small fluctuations, and the concentration did not increase after these points.
