<a href="https://en.wikipedia.org/wiki/Canadian_Space_Agency" class="extiw" title="en:Canadian Space Agency">Canadian Space Agency</a> astronaut <a href="https://en.wikipedia.org/wiki/Chris_Hadfield" class="extiw" title="en:Chris Hadfield">Chris Hadfield</a> is fitted with oxygen sensors prior to EVA during <a href="https://en.wikipedia.org/wiki/STS-100" class="extiw" title="en:STS-100">STS-100</a> mission in April 2001.
NASA
<a rel="nofollow" class="external free" href="http://www.canadiangeographic.ca/magazine/dec10/images/space_station3.jpg">http://www.canadiangeographic.ca/magazine/dec10/images/space_station3.jpg</a>