Figure 3.
Scatter plots of PSD and mobile observations for NOx in Los Angeles (a) and Baltimore (b), and for NO2 in Los Angeles (c), at the collocated 43 sampling sites
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.