Abstract
In order to prove the effect of the air pollution on the respiratory organs or the inhabitants in the industrial city, this report surveyed the concentration of the suspended fine dust in doors and out of doors at several districts in Kawasaki city and at the same time the pneumoconisis examination was made for the inhabitants in the factory districts, where the concentration of dust in the air showed comparatively high percentage.
The following result obtained:
1) The concentration of the suspended dust in the air on the streets of the factory districts showed average 500 particles per cubic centimeter (c.c.) a year and in some places, that stood 800-1000 particules per c.c., that is the allowable limit of the harmfull affairs. In such districts the concentration of the suspenbed dust in doors differed little from the dust concentration on the street and showed higher percentage than the hyginical allowance. In comparison with the fact that the percentage of ashes in the falling dust was about 50 percent in the residenral districts, that was high 70 percent in these factory districts. As to the quantity of dust, the inhabitants in the factory district were exposed to the several times as many as the inhabitants in residental districts.
2) The 47 percent of the people who had lived more than for ten years in the factory districts, but who had never worked at the dusty affairs, had the symptons of pnemoconiosis, even they were not so serious. The rate of the attack with pneumoconiosis in the places where the suspended dust in the air stood 500-600 particles per c.c. was about 1.5 times as many as the rate of the attack in the places that had 400-500 particles per c.c.
