The content of the anion in the air is the mark of ecological enviroment quality. A certain concentration of the air anions has the functions of healthcare and curing to the human. The air anion is the motivity of urging the people to return to the nature, the premise condition of establishing recuperation zone and developing ecotourism, the key of further developing scenic spots , the important content of planning tourism cities and towns. Therefore, it is the foundation of sustainable ...
