抄録
Aphysical measurement, as well as chemical analysis, of air pollutants is one of the most important research to clarify the effects of the pollutants on the human body, especially on the respiratory organs.
In this paper, numbers and sizes of the acid mist particles in the ambient air were investigated at the four sites near industrial areas for one and half years, and the following results were obtained.
(1) The observed numbers of the acid mist particles were in the wide range from 0 to 26, 700/m3, depending on the sampling times and sites.
(2) The diurnal changes in the acid mist particle concentrations are classified into seven types of categolies. Among them, the most frequently observed type, mainly in autumn and winter, was that the observed values of particle numbers were high in the morning and the evening and lower in the daytime.
(3) The observed sizes of the acid mist particles were in the range from 1μEm to 8μm, depending on the sampling times and sites. In most cases, the considerable part of all particles was occupied by the smaller particles of about 1μm.
(4) The diurnal changes in the acid mist particles size distribution are classified into eight types of categolies. Among them, the most frequently observed type was that all of the particles were less than 2μm and the distribution rate was not changed.
(5) In summer, the observed values of the acid mist particle concentrations were high and the minor particles occupied the main part of the size distribution.
