A mortality study was carried out among workers employed in theArcelor and GTS Industries plants in Dunkerque. It was aimed atassessing the possible association between iron oxide exposuresand lung cancer risk. The cohort comprised 16,742 males and 959females. Among males, the observed mortality was lower thanexpected for all causes. No significant lung cancer excess was observedfor exposure to iron oxides and no dose-response relationshipwith intensity and duration of exposure.