Comprehensive aerosol measurements were carried out during winter (19 December 2014 to 13 January 2015) in Fresno (San Joaquin Valley) and summer (4 to 28 July 2015) in Fontana (Southern California Air Basin). The sampling site in Fresno, managed by University of California Davis, was located behind the UC extension building at 550 Shaw Ave. (36.810 N, 119.780 W). Residential buildings to the north, commercial complexes to the south, and the Yosemite Freeway to the west of sampling location allowed repeated daily measurements of both the residential wood burning and traffic emissions in Fresno. The sampling site in Fontana, managed by South Coast Air Quality Management District, was located behind the fire station at 14360 Arrow Highway (34.100 N, 117.490 W). Surrounded by the I-15 freeway to the west, I-10 freeway to the east, and an auto speedway to the south, the sampling location was primarily influenced by vehicular emissions.
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