Abstract
In this paper, the present author studied quantitatively the atmospheric impurities in the central part of Tokyo during April, 1939-March, 1940.
The outer air was sucked by the water-pump through the fine glass filters making sufficiently fine bubbling in distilled water. Chloride, sulphuric acid, ammonia and nitrite contained in the atmosphere were chemically estimated in water through which the air-bubbles had been passed.
The chief results obtained are as follows:-
ξChloride. 1. The yearly average; 7.68γ/m3 as Cl.
2. There was a negative correlation between the chloride content and the humidity of the atmosphere.
ξSO2(and H2SO4)-Sulphur. 1. The yearly average; 22.20γ/m3.
2. Sulphuric acid content was lamer in winter than in summer.
ξAmmoniacal Nitrogen. 1. The yearly average; 14.92γ/m3.
2. In the annual variation a maximum occurred in June and a minimum in January. There was a parallelism between the yearly variation of ammonia and the air temperature.
ξNitrite Nitrogen. 1. The yearly average; 2.68γ/m3.
2. The annual variation of nitrite was quite similar to that of sulphuric acid.
