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Map of two sampling locations (a). The University of Texas Health Science Center at Houston (UTHealth) School of Public Health (coordinates 29.7065807, −95.401509) was selected as an urban background sampling site (i.e., high-SES community site) (b). An ambient air monitoring site (coordinates 29.734154, −95.257583) maintained by the Houston Health Department Bureau of Pollution Control and Prevention was chosen as a low-SES community sampling site (CSS) (c)
