This one-hundred-and-third volume of the IARC Monographs contains evaluations of the carcinogenic hazard to humans of bitumens and bitumen emissions, and of some N- and S-heterocyclic polycyclic aromatic hydrocarbons (referred to as azaarenes and thiaarenes, respectively). This volume is the fourth in a series of IARC Monographs volumes evaluating exposures related to air pollution. Indeed, the IARC Monographs Advisory Group that met...