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Chromium is a metal; uses include stainless steel, leather tanning, and wood treatment. There are three principal forms; of these, hexavalent chromium (chromium VI) is of greatest concern.

Chromium
Image via Wikimedia Commons.

The International Agency for Research on Cancer has determined that hexavalent chromium is carcinogenic to humans, especially lung cancer resulting from worker exposure to hexavalent chromium vapors.