No abstract

No abstract

No abstract

No abstract

Measurements were made of sulfate and other inorganic materials in fog and cloud water in 1963. It was found that in cumulus clouds above Mt. Norikura, sulfate was in the form of ammonium sulfate and sulfuric acid. In upslope fog at Shiobara, and in stratus cloud which covered Mt. Tsukuba, sulfate was supposed to be combined with some metals in addition to ammonium ions, During the periods of September 1962 to February 1963, and of July to December 1966, separate samplings of large and giant particles were made in Tokyo by means of a high volume cascade impactor. It was found that the weight ratio of SO4'`/SO2 was above 0.12 at relative humidity above 55%, wind velocity below 4 m/sec and visibility below 5 km, It seems that atmospheric humidity is an important factor for the atmospheric oxidation of SO2. The relationship of the amounts of sulfate and ammonium was also studied. These studies indicate that various weather and environmental conditions affect the atmospheric oxidation of SO2. The atmospheric concentration of hydrogen ion contained in aerosol was usually below 3 x 10-2 pg/m3 except on October 26, 1966, when the atmospheric concentration of hydrogen in large particles was 1.7 to 7.5 g/m3 in heavy smog.