Fig. 1.
Average chemical composition of concentrated ambient coarse, fine, and quasi-ultrafine PM collected from Toronto (EC = elemental carbon, OM = organic mass, WS = water-soluble elements (anions, cations, amines, organic carbon (OC))).
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.