A four week repeated measures personal air pollution exposure study was conducted in the city of Ostrava, Czech Republic, during October and November 1995. Personal exposure monitoring with 30 participants was conducted to determine the relationship between individual air particulate exposures and subsequent biomarkers of exposure and dose to DNA (not reported here). The 24 hour exposure periods for each individual were divided into day time at the central work site (KHS-Ostrava) and night time (e.g., at home) away from the central work site. Each individual was repeatedly monitored one day per week for four weeks. Individual blood and urine specimens, along with a 24 hour activity log, were collected in addition to fine ambient air particulate matter during each sampling period. Stationary indoor and outdoor monitoring of fine ambient air particulate matter at the central site was also conducted. Outdoor ambient monitoring at several sites across the city of Ostrava was conducted simultaneously.