RESEARCH ON THE HYGIENIC STANDARD FOR NEGATIVE IONIN AMBIENT AIR OF RESIDENIAL AREAS
Xu Ye Lin at al. (Anhui Epidemic prevention station. Hefei 230061)
According to data of 1366 mornitorings of negative ion concentration of residential areas in nine provinces and municipalities means, stardard deviations (SD) and stardard errors (SE) were concluded from diagram analysis with normal curve fitting of frequency distribution, Then, one-sided test was made to get low limit of 80%confidence range (u=0.842) based on these, one suggested stardard value was given, 320/cm3. The resarch shows that the geometric mean (GM) of one-rod coefficient (q) (n+/n-) is 1.31 and comment index (CI)0.24. Thus q value and CI value may be used as one of reference indicators for appraising air clearness.
【CateGory Index】： R122