Region |
Content ( anion integer /cm3) |
Relationship |
Forest waterfall area |
10000-50000 |
To have the nature to convalesce the strength |
Mountain seashore |
50000-100000 |
To have the function of sterilization and reduce disease to infect |
Suburb field |
5000-50000 |
To enhance people¡¯s body immunity and have the antibacterial strength |
City Park |
1000-2000 |
To maintain basic needs of health |
Afforests Area of Streets |
100-200 |
To induce the physiological barrier edge |
Metropolis housing seal area |
40-50 |
To induce the physiological barrier, like the headache, insomnia and neurasthenia, or tired allergic disease. |
Closed air conditional room |
0-25 |
To initiate air conditioning sickness |