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Although, mercury performs many useful functions, it is toxic to humans and wildlife and should be managed properly. When liquid (elemental) mercury is spilled, it forms beads or droplets that can accumulate in the tiniest places. These droplets can emit vapors into the air that we cannot see or smell. Breathing mercury vapors can be very dangerous, depending on how much mercury is in the air and how long you breathe the contaminated air. Entire families have been poisoned from mercury spills. Small children and pregnant women are at highest risk for mercury poisoning, but mercury poisoning can impact anyone.