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.
Average indoor (IN) and outdoor (OUT) mass concentrations (μg/m3) of elemental carbon (EC), water-soluble organic carbon (WSOC), and water-insoluble organic carbon (WIOC) in the fine PM size fraction by site during the warm and cold phases. Error bars correspond to one standard deviation.
