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.
Correlations of monitor-level daily PM time series calculated between pairs of PM2.5 or PM10 − 2.5 monitoring locations in the same county and plotted versus the distance between monitor pair. For PM2.5, we used all available monitors without restricting to those with a collocated PM10 monitor.
