The trend of concentrations of some pollutants (total particulate, polycyclic aromatic hydrocarbons (PAH), benzo(a)pyrene (BaP), chromium, nickel, lead, vanadium) in the urban air of Turin for the years 1986-87-88 was studied. The air was sampled daily by glass fiber's filters; a ponderal determination of total particulate was made; PAH was dosed by gas-chromatography and by mass spectrometry, metals was determined by atomic absorption spectrometry. These are the values of the three years mean concentration: total particulate 156.3 micrograms/mc, PAH 27.2 ng/mc, B(a)P 2.16 ng/mc, Cr 28.6 ng/mc, Ni 40.5 ng/mc, Pb 1.37 micrograms/mc, V 55.2 ng/mc. Finally, we try to calculate the conjectural carcinogenic effect of the B(a)P for the residents of Turin.