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.
Maps (a) of the number of minimum CLs exceeded through time, and (b) temporal plot of the total area of CMAQ grid cells with 0–6 exceedances. The gray dashed line shows the area of the contiguous United States for which there is no CL (“null”).
