RESUMEN
To determine the indoor iron Oxide [FeO] concentrations in two production lines 630 and 650 and compare them with REL- NIOSH. National Institute for Occupational Safety and Hygiene [NIOSH] No 550 is used for the determination of FeO concentrations in Beam Rolling Mills Factory. The total size sample was 80 for indoor FeO in each production Line 630 and 650 respectively. Samples [FeO] were collected using Low volume sampling pump operated at flow rate of 2 L/min-1 on membrane fitters with pore size 0.5 micrometer and 27mm diameter. CTA 3000 Atomic Absorption Spectrophotometer was used. There is a significant difference between mean FeO concentrations in Lines 650, 630 and NIOSH [5 mg/m3] [Pc 0.05]. It is not a serious health problem for workers. 100% Mean value of Iron oxide concentrations i.e., 20 stations in production Lines 650 and 630 are at a safe level