Question 149Safety & Environmental - 1st Asst/Chief

The correct answer is B) paralyze your breathing system. High concentrations of hydrogen sulfide gas are most dangerous because they can paralyze the respiratory system, leading to rapid unconsciousness and respiratory arrest. This is due to the gas' ability to disrupt the normal functioning of the body's oxygen utilization process, effectively shutting down the breathing mechanism. The other options are incorrect as they do not accurately represent the primary danger of high hydrogen sulfide concentrations, which is the risk of asphyxiation from respiratory paralysis.