Figure 6.
Average concentration of NO on 12 September, 2018 from 10 a.m. to 6 p.m. at the regular pavement (blue) and photocatalytic pavement (red).
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.