Based on the results of the NIOSH quantitative risk assessment [Park et al. 2004], NIOSH recommends that airborne exposure to all Cr(VI) compounds be limited to a concentration of 0.2 µg Cr(VI)/m3 for an 8-hr TWA exposure, during a 40-hr workweek. The REL is intended to reduce workers’ risk of lung cancer associated with occupational exposure to Cr(VI) compounds over a 45-year working lifetime. It is expected that reducing airborne workplace exposures to Cr(VI) will also reduce the nonmalignant respiratory effects of Cr(VI) compounds, including irritated, ulcerated, or perforated nasal septa and other potential adverse health effects. Because of the residual risk of lung cancer at the REL, NIOSH recommends that continued efforts be made to reduce exposures to Cr(VI) compounds below the REL.