Main symptoms of hydrogen toxicity (See <a href="https://en.wikipedia.org/wiki/Hydrogen#Safety_and_precautions" class="extiw" title="wikipedia:Hydrogen">Wikipedia:Hydrogen#Safety and precautions</a>. 
<p>References:
</p>
<ul><li><a rel="nofollow" class="external text" href="http://www.lenntech.com/Periodic-chart-elements/H-en.htm">Lenntech: Health effects of hydrogen - Environmental effects of hydrogen</a> Received on 11 February, 2009</li></ul>
Model: Mikael Häggström. To discuss image, please see <a href="//commons.wikimedia.org/wiki/Template_talk:H%C3%A4ggstr%C3%B6m_diagrams" class="mw-redirect" title="Template talk:Häggström diagrams">Template talk:Häggström diagrams</a>
<a href="https://en.wikipedia.org/wiki/User:Mikael_H%C3%A4ggstr%C3%B6m" class="extiw" title="en:User:Mikael Häggström">Mikael Häggström</a>
2009-02-11
See above. All used images are in public domain.