Hydrogen sulfide occurs naturally and is also produced by human activities. Just a few breaths of air containing high levels of hydrogen sulfide gas can cause death. Lower, longer-term exposure can cause eye irritation, headache, and fatigue. For more on hydrogen sulfide, go to the ATSDR website at http://www.atsdr.cdc.gov/tfacts114.html#bookmark01 . This is clipped from the 1973 Bureau of Mines film, Breathe and Live: Ventilation in Metal and Nonmetal Mines (21 minutes).
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