Outdoor near-roadway, community and residential pollen, carbon dioxide and particulate matter measurements in the urban core of an agricultural region in central CA

► Weekday and study week mean CO2 and PM2.5 concentrations were higher near homes. ► Daily peak measures, however, were elevated at a central site near the freeway. ► Overnight/pre-dawn time period averages were elevated at a central site (SJVC). ► Residential pollen counts were lower than SJVC near agricultural tree production. ► Outdoor central site air quality alone insufficiently describes exposure in homes.