Abstract
The evaluation of the impact of contamination in breathing air intended for hyperbaric purposes is essential both for practical and theoretical reasons. The quality of breathing air and the breathing mixes obtained on its basis is of crucial importance with regard to divers’ safety in the course of underwater works. The existing contaminants, as well as substandard quality gases have an adverse impact on divers’ health and life, both in terms of the physiological impact on the body, and fire hazards in hyperbaric complexes. In the process of breathing air production we deal with a few sources of potential contaminants stemming from technical measures. The human body is also responsible for the release of contaminants in hyperbaric conditions. The article presents the above issues and provides insight into existing threats.