EPA project officer: Joann Rice. "May 2019." PB2019-100927 "EPA 454/R-19-005." "STI Final Report, STI-915313-6843"--Colophon. "Prepared by Sonoma Technology, Inc."--Colophon. "November 12, 2018"--Colophon. Includes bibliographical references (page 27)

"As part of an EPA project to evaluate the feasibility of the Sunset Semi-Continuous Organic and Elemental Carbon (OC/EC) monitor, EPA sponsored the deployment of this monitor by local air quality agencies at Chicago, Illinois; Houston, Texas; Las Vegas, Nevada; St. Louis, Missouri; Rubidoux, California; and Washington, D.C. Sunset monitors were collocated with existing 24-hr measurements of OC and EC via filter sampling as part of the Chemical Speciation Network (CSN); at Houston, St. Louis, and Washington, they were also collocated with Aethalometer instruments, which measure black carbon (BC). Sunset data were compared to CSN and Aethalometer data to assess whether the Sunset monitors could be deployed in lieu of making filter measurements at routine monitoring stations. In addition, two Sunset monitors were collocated at EPA OAQPS' on-site monitoring station to assess detection limits and precision via injections of known sucrose standards."--Page 1