What is a primary danger associated with nitrogen in enclosed spaces?

The primary danger associated with nitrogen in enclosed spaces is asphyxiation. This occurs because nitrogen displaces oxygen in the air, and when oxygen levels drop below what is necessary for human life, it can lead to suffocation. In environments where nitrogen is used, the risk increases especially in confined spaces where ventilation may be limited. Workers can run the danger of unconsciousness and even death due to the lack of available oxygen, which is critical for survival.

While other options might involve health risks, such as increased breathing rate or the potential for severe lung damage due to lack of oxygen, asphyxiation is the most direct and immediate threat posed by an atmosphere that is too rich in nitrogen and lacks sufficient oxygen for breathing.