Fig. 2.
(a) Sensor package design used to test the PPD20V sensor during the Atlanta roadside testing (b) and (c) Shinyei particle sensor comparison box used during Hyderabad, India, and Atlanta rooftop testing.
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.