The influence of the titania photocatalyst particle of the nanometer region on the human
being and biology’s to be doubted. Removing the uneasiness will expand further uses for the
photocatalyst nanoparticle. Then, we attempted to examine the effect of several titania photocatalyst
nanoparticles to the artificial skin like the human body under the UV and visible light irradiation
conditions. The decomposition degree of the artificial skin was evaluated from the monitoring of
the amount of carbon dioxide generated from them by the titania photocatalyst nanoparticle activity.
Under the UV irradiation condition, it was almost found the carbon dioxide emergence from the
artificial skin by the activity of the titania photocatalyst nanoparticle. On the other hand, under
visible light condition it was mostly detected.