Southwest Regional Mine Rescue Field Exam
Taken from the 2019 Southwest Regional Mine Rescue Contest held in Ruidoso, New Mexico

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Question 2 of 30

2.  An elevated concentration of nitrogen in mine air can be harmful because:

Choices:
  1. it can lower the oxygen content of the air
  2. it is highly explosive
  3. it is highly toxic
  4. all of the above

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