Figure 3.
The device bag for the GPS and mobile sensors. (a) The portable devices are packed into a device bag; (b) air pollution sensors and noise sensors are placed in the two external mesh pockets on the two sides of the bag.
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.