Oxygen Bars: Do they reduce health damage due to pollution

Oxygen Bars are supposed to improve health and well-being. Oxygen bars started spreading in nineties in Japan, California & Britain. In trade fairs, health clubs and airports.. Now these are opening in France. These are being marketed as anti- stress, anti-fatigue, and anti-depression help. One of such bar has been opened in a beauty institute..The health inspectors are trying to determine the merits and demerits. Of sniffing O2. Some experts are of the opinion that the the effect is more psychological than technical.
The oxygen bars offer the sniffers up to
95 %
of oxygen compared to 21% of atmospheric oxygen in the cities due to severe pollution.