In which situation is nitrogen (N) testing required?

Testing for nitrogen (N) is required in situations where nitrogen is emitted from rock strata because this particular environmental condition poses a potential risk to workers. Nitrogen can accumulate in certain geological formations and may lead to hazardous situations if it displaces oxygen, creating an asphyxiation risk in confined spaces or poorly ventilated areas. Understanding the levels of nitrogen present helps ensure that safety measures are in place to protect workers from these hazards.

For the other situations, while methane presence is significant, testing nitrogen in that context is not inherently necessary since it focuses on methane safety. After a fire incident, the focus would typically be on testing for carbon monoxide or other combustion byproducts rather than nitrogen specifically. Lastly, conducting tests solely during training exercises does not correlate with the need for safety measures and monitoring in practical, real-world scenarios where nitrogen emissions might pose a risk.