Abstract
In a forest or near the waterfall, people feel refreshing or so good. Recently, a part of scientists, explained about this fact. As one theory, this matter may be caused by a minus ion. It is said that minus ion is made by garnet system ceramics as used jewel. Then if the Garnet is mixed with paint or wall materials, people will be able to be led in comfort. And we experiment ammonia, formaldehyde gas and nitrogen oxide gas adsorption characteristic of garnet system ceramics for we get to the bottom of the fact.
