Human are widely exposed to polycyclic aromatic hydrocarbon (PAHs), but existing evidence about exposure to urinary PAHs metabolites for pulmonary health in children and adolescents is limited. Our aim was to examine the effect of single and mixed exposure of urinary PAHs metabolites on lung function among children and adolescents. We included 1417 individuals aged 6-19 years from 3 survey cycles (2007-2008, 2009-2010, 2011-2012) of NHANES program. Multivariable linear regression model was conducted to examine the relationship between urinary PAHs metabolites and lung function index including FEV