In this present work, the diel cycles of atmospheric particulate n-alkanes, polycyclic aromatic hydrocarbon (PAHs) and highly-polar organic components (HPOCs) were determined at the industrial, urban and forested sites located in Bouira province, 80 km south-East from Algiers city area. Toxic PAHs were monitored inside some industrial factories in order to evaluate the impact of indoor air pollution to the workers' health.