The influence of negative air ions on driver’s mental stress and fatigue was investigated in this study. Two kinds of driving-task loading, produced by a simple driving simulator, were conducted under negative air ions.
Although there was no difference in sensory evaluation between the negative ion condition and the control condition, the level of adrenaline in the urine was lower under the negative ion condition than that under the control condition.
Misses in detecting the lighted LEDs were decreased under the negative ion condition. These results show that negative air ions can improve fatigue and cognition performance of the drivers.