Individual exposure to total PAHs, urinary 1-OHPlevels, and DNA adduct levels measured in school chil- dren are summarized in Table 3. Individual exposure to total PAHs is 3.5-fold greater in Bangkok school chil- dren compared to Chonburi school children (P < 0.001). In all school children, afternoon urinary 1-OHPlevels, or levels the next morning, were not significantly different