Measurement of genotoxic air pollutant exposures in street vendors and school children in and near Bangkok

School children from two schools in Bangkok were exposed to total PAHs and benzene at levels of 6.70 ± 0.47 ng/m3 and 4.71 ± 0.25 ppb, respectively, higher than those to which children living outside the city were exposed (1.25 ± 0.24 ng/m3 total PAHs; 2.10 ± 0.16 ppb benzene). At the end of the school day, levels of urinary 1-OHP and t,t-MA were significantly higher (P < 0.001 and P < 0.01, respectively) in Bangkok school children (0.23 μmol/mol creatinine and 0.27 mg/g creatinine, respectively) than in school children from outside Bangkok (0.10 μmol/mol creatinine and 0.08 mg/g creatinine, respectively).