What operational change decreases the risk of asphyxiation related to cryogens?

Increasing ventilation is the operational change that effectively decreases the risk of asphyxiation related to cryogens. Cryogens, such as liquid nitrogen and helium, can displace oxygen in the air when they vaporize. If there is inadequate ventilation, the concentration of oxygen in the environment can drop to dangerous levels, leading to asphyxiation. By increasing ventilation, you ensure that any spilled cryogens can quickly dissipate and that fresh air is circulated, helping to maintain safe oxygen levels in the space.

This approach is particularly important in confined spaces where cryogen use occurs since the risk of oxygen displacement from boiling or vaporizing cryogens is heightened in enclosed environments. Increased airflow helps prevent the accumulation of gases that can lead to asphyxiation hazards.

While the other options may contribute to overall safety or manage cryogen usage, they do not directly address the critical issue of oxygen displacement in the immediate environment. For example, using less cryogen may reduce the volume of gas released but does not guarantee sufficient ventilation in the area. Reducing ambient temperature and decreasing pressure might alter the state of the cryogen but do not provide a direct method for preventing asphyxiation caused by oxygen deficiency.