Indium is used in electronics, mostly in flat screens as indium-tin oxide (ITO), but little is known of its toxicity and carcinogenicity to humans (Fowler, 2009). Indium concentrations in blood, plasma, and urine of the recycling workers were approximately twice as high as those of the office workers, and the concentrations seemed to increase with increasing concentrations in the inhalable fraction. Indium was the only metal in the inhalable fraction that was significantly higher for dismantling than for either the other two work task categories. This might be attributed to the fact that ITO is used as a thin film in different types of displays, mostly LCDs. Dismantling was also the only work category in which workers came in direct contact with different types of displays, both whole and shattered ones, when recycling the units. No such task-specific difference was seen for the exposure biomarkers; however, recycling workers had about twice as high In concentrations in all biomarkers compared to the office workers.