Thirty two daily indoor and outdoor samples at sixteen nursery schools in Ha Noi were taken from March to April 2018. 15 individual PAHs were analyzed by GC/MS. Mutagenic potential (MP) and carcinogenic potential (CP) were used to evaluate carcinogenic and mutagenic risk contribution. The average concentrations were μg/m3 for indoor air and μg/m 3 for outdoor one, which exceeded WHO Air quality guideline (2004) for ambient air. The mean concentrations of indoor and outdoor 15PAHs were ng/m3 and ng/m3 , respectively. There was a good correlation between indoors and outdoors for both and PAHs. Indoor MEQ 7PAHs was ng/m3 , whilst outdoor MEQ 7PAHs was ng/m3 . The mean level of indoor TEQ 15PAH was ng/m3 , whereas the outdoor TEQ 15PAH was ng/m3 . Dibenz(a,h)anthracene (DahA) and benzo(a)pyrene (BaP) were the most contributors among indoor and outdoor PAHs to the carcinogenicity and mutagenity. | pahs in the indoor and outdoor air of nursery schools in Ha Noi Viet Nam and health implication
