A running automobile emits exhaust gas and saises a cloud of dust particles from a road. The aim of this paper is to estimate the horizontal and vartical distributions of the exhaust gas and the amount of dust particles around the straight road on which an automobile runs making an angle of θ degrees with wind direction. Calculation is made by an electric computer applying O. G. Sutton's equation and his atmospheric stability-parameters to the next two cases. The one is the caseof an arbitrary angle of θand for example, θ is assumed to be 70°. The other is a particular case when wind blows parallel to the road (θ=0). Moreover, in the case of θ=0, the result of the calculation is compared with observed values of dust falls about horizontal and vertical distribution.

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An indirect method involving the combined use of 2-aminoperimidine and dinitrosulfonazo III was studied for the determination of sulfate ion in rainwater.
The advantages obtained with the proposed method are as follows.
This method was found to be 50 times as sensitive as the widely used barium chloranilate method which has been. The lower limits of determination was 0.2 ppm for rainwater.
The calibration curve obtained by the present method was linear for the range of 0 to 20 ppm, showing a satisfactory reproducibility as evidenced by the coefficient of variation of 3% found for repeated experiments.
No noticeable interference by foreign ions at concentrations of 10 to 20ppm was observed, and the color stability was satisfactory.
The sulfate ion concentrations in rainwater were found to be 3.4 to 17 ppm by the present method, showing a good agreement with the results obtained by the nephelometric method using barium chloride, one of the conventional methods for determining sulfate ion.

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Investigations made to establish a method for determining hexavalent and total chromium in the environmental atmosphere have led to the following conclusions.
1) A loss of hexavalent chromium was observed when a high-volume air sampler was employed to collect chromium in air. It was concluded, therefore, that the use of a high-volume air sampler permitted the determination of total chromium, but not that of hexavalent chromium.
2) The most suitable means for collecting the hexavalent chromium in the environmental atmosphere was an impinger, and the best collecting solution was found to be a mixed solution made up from an APDC solution, an acetate buffer (pH 4) and an EDTA solution.
3) The environmental atmosphere was analyzed for hexavalent and total chromium by the present method, and the ratio of the hexavalent to the total chromium concentration was found to be within the range of 30 to 50%.

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The triethanolamine-filter paper can be used for the measurement of not only nitrogen dioxide but also sulfur dioxide and formaldehyde in the atmosphere.
The test paper is a filter paper that is soaked in 20% triethanolamine solution and dried at room temperature.
The test paper is exposed in the atmosphere for one or two days in a plastic cell.
After the exposure, it is extracted with water, and nitrogen dioxide, sulfur dioxide and formaldehyde in the extracted solution are measured by diazotizing method, p-rosaniline method and 4-amino-3-hydrazino-5-mercapto-1, 2, 4-triazol method (AHMT method), respectivery.

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Atmospheric constituents of trace gases (SO₂, NO₂, HNO₃, NH₃, HCl) and aerosols (SO₄^2-, NO₃^-, NH₄⁺, Cl^-) were measured at Mt. Tsukuba, Mt. Teruishi and Ohira. Their vertical distributions were also measured.
Aerosol components were collected on cellulose nitrate filters impregnated with various reagents. The concentrations of constituents were colorimetrically determined.
It was found that higher concentrations of oxidants and higher air temperature promoted the formation from SO₂, NO₂ and NH₃ to SO₄^2-, HNO₃ and NH₄⁺ respectively. Most of SO₄^2-and NH₄⁺ formed (NH₄) ₂ SO₄ in aerosols. The vertical distributions of primary pollutants.decreased with increasing height, while the concentrations of secondary pollutants were uniform or had peaks at several hundred meters above the ground.

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In Japan the A. S. T. M. syringe method has been widely used as a means of measuring odor concentration. This method, however, has several disadvantages, such as adsorption of odors on the syringe surface and small capacity of syringe.
Thus, in order to eliminate the disadvantages in the method, the syringe was replaced by th plastic bag (the volume is 3 liters), and the preconceived idea of the panel was removed by adopting the triangle method.
The volumetric error of the bag was at most several percent as a result of our experiments, and the diffusion rate of sample gas in the bag was less than 1 minute.
Measured results of this method were 410-1, 700 odor concentration at the printing (gravure), 31, 000 at the fishmeal plant, 97-310 at the boiler (city gas, kerosene), 4, 100 at the boiler (heavy oil C) and so no. The results were in approximate agreement with the damaged condition.

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Measurements of coarse (>2μm) and fine (≤2μm) particles concentrations in the aerosols of Nagoya urban area were made, and the natural burden to aerosols in urban air was described.
The arithmetic mean concentration of coarse particles except in spring was about 25μg/m³, which was in good agreement with the global background aerosol concentration in Japan. In spring, the yellow sand dust were transported from the Ordos and Gobi deserts, so that the concentration of coarse particles increased to 45μg/m³. The results of the arithmetic mean and coefficient of variation of coarse and fine particles concentrations indicated that the origin of coarse particles in urban air was not an anthropogenic source. From the concentration ratio of coarse particles to total aerosols, it was estimated that the environmental impact from natural sources was 35 to 40% of the total aerosols in the Nagoya urban area, and especially in spring was 50%.

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