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.
Participant estimates of A. year-prior average fine particulate matter (PM2.5) and B. major roadway proximity exposure, by study site. MN indicates St Paul, Minnesota; NC, Winston-Salem, North Carolina; MD, Baltimore, Maryland; NY, New York, New York; IL, Chicago, Illinois; and CA, Los Angeles, California .
