Calculated respiratory exposure to indoor size-fractioned polycyclic aromatic hydrocarbons in an urban environment

► Particulate PAHs are predominantly distributed in accumulation mode particles. ► Volatilization and condensation are the main causes for the particle size distribution of PAHs. ► Accumulation mode particles contribute major respiratory deposition of PAHs. ► Inhalation of indoor particulate PAHs poses cancer risk, depending on specific assumptions.