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.
The data is described by the Excel sheet tab names. For example, the first Sheet "Treatment designation" shows whether the sample came from a classroom that received the HEPA or Control...
data.gov
An official website of the GSA's Technology Transformation Services