If using air for decompression on surface, what adjustment should be made at treatment depth?

When conducting decompression using air on the surface, it's important to recognize that the atmospheric pressure at the treatment depth significantly alters the partial pressures of gases within the body. Decompression rules are typically based on the specific partial pressures experienced during ascent.

Multiplying subsequent stop times by 1.5 provides a means to adjust for the increased pressure at the treatment depth, which can benefit the diver's safety. This adjustment accounts for the fact that at greater depths, the body absorbs more nitrogen due to higher partial pressures, necessitating a longer time to safely surface without risk of decompression sickness.

This approach also aligns with the common practice of using a modified decompression schedule in hyperbaric oxygen treatments, ensuring that the diver remains safely within the physiological limits of gas off-gassing under varying pressure conditions. Thus, by applying these additional stop times at the treatment depth, the chances of successful decompression are improved while minimizing the risk of complications associated with rapid ascent.