cf. This Journal II 15 (1937) 529.
The quantities of the atmospheric impurities in central Tõkyõ have been chemically estimated since the last spring. The results are as follows.
max. min.
SO₂(and H₂SO₄)-Sulphur 8.8γ/m³ 0.1/γm³
Ammoniacal nitrogen 47.8 3.0
nitrite nitrogen 16.8 1.6
chloride 100.3 trace.
The seasonal variations of each components are also briefly discussed.