The atmospheric corrosion rates of several metals depend on the concentration of air pollutants. This phenomenon was applyed to estimate the concentration of air pollutants at three zones in Hyogo Prefec. The corrosion rate of the metal was represented as the reflectances of the metal by red and blue lights (RR and RB).
The relations between the reflectance as RR_Ag, RB_Ag, RB_Zn and these population probavility were found of approximately logarithmic normal distribution. In 3 zones, the correlation coefficient between RR_Ag and RB_Ag was found to be larger than that between RR_Cu and RB_Cu, but the other correlation coefficients between two reflectances of RR_Ag, RB_Ag, RR_Cu and RB_Cu differed from the each other in relation to zoes. The correlation coefficients in 2 zones between RB_Ag and RB_zn were found to be larger than the other's between two reflectances of RR_Ag, RB_Ag, RR_Zn and RB_Zn.

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In paper I, an atmospheric corrosion of metals as Ag, Cu, Zn, etc. was studied by the reflectance of red light or blue light.
The phenomenon that the break point of elongation of rubber depend on an atmospheric corrosion of metals or atmospheric pollution is applied to in this work. The ratio of the break point of elongation of exposed rubber to the break point of elongation of unexposed rubber was calculated for all samples at 3 zones. The relative coefficient between this ratio and each reflectance of metals was calculated by each zone. The phenomena that this ratio depended on RR_Cu (reflectance of copper to red light) and RB_Zn (reflectance of zinc to blue light) were found out.
From these phenomena, we could deduce that an atmospheric pollutant induced these phenomena was oxidant or oxygen because Cu₂O holds 630 mμ resonance and ZnO holds 390 mμ resonance.

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In summer, 1975, the influence of photochemical air pollution to the health was investigated in students in Saitama Prefecture. On July 15th, high concentration of oxidant (0.33 ppm at FUJIMI) was marked over the south region of the Prefecture, northern suburbs of Tokyo metropolitan area.
At “M” Junior high school in the city of OMIYA, 83% of the students complained of various subjective symptoms. Many of the symptoms were those due to mucosal irritation, such as eye irritation (60.1%), stifling (48.6%), sore throat (46.8%) or coughing (33.9%). General symptoms, such as fatigue (21.8%), headache (17.4%), nausea (4.2%) were also noted.
Many of the students of the third grade, playing volley-ball outdoors in the morning, complained these symptoms already between 10 and 12 o'clock, when oxidant concentration was still low (0.1-0.2 ppm of oxidant concentration at the public office of OMIYA city, 2 km from the school). However, majority of the students of the first and the second grade, many of them taking lessons in the room, complained of symptoms between 13 and 14 o'clock, when oxidant concentration was maximum (0.2-0.23 ppm).
It is suggested that the difference of the time when subjective symptoms occurred in the two groups is attributed to the effects of outdoor exercise.

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The analysis and the modeling of photochemical reaction mechanism in the atmosphere are useful for the following objects.(1) The estimation of the levels for oxidants, NO_X, PAN, and others.(2) The reasonable control to the sources.(3) The finding out of injurious chemical species.
The detail model for the reaction mechanism may be useful for the third object, and the more simplified model may be useful for the prediction of concentration for O₃ and a few other species in the atmosphere.
The basic reaction model was identified on the basis of the C₃H₆-NO_X reaction system. The more simplified three models were derived from the basic reaction model. The basic reaction model is organized from 14 chemical species, 3 final products, and 29 chemical reactions. The most simplified model is organized from 10 chemical reactions and one additional modified reaction term. The model consists of 7 chemical species and 3 final products.
The experimental results by Spindt and Altshuller et al. were employed to the estimation of several parameters in those models. The field photochemical reaction is too complex in order that the atmosphere includes many chemical species. Therefore, the most simplified model was adopted to the field chamber experimental results to make free from the error accumulated by uncertain factors contained in a complex model, even if it were built. The physical and chemical effects of sulfur compounds and aerosols are excluded from consideration of reaction mechanism.

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During the summer of 1975, effects of photochemical oxidants and other factors on health of schoolchildren and students were investigated in Saitama Prefecture, northern suburbs of Tokyo metropolitan area. The levels of each air pollutant and meteorological foctor were divided to 4, 5, 6 or 8 ranks and ratios of ones who had acute complaints to person days were compared with each other.
Oxidant concentration most closely related to the ratio. The incidences stepwise increased from 0.02% to 0.3%, 3% in accordance with the elevation of oxidants levels (-0.07 ppm, 0.12-0.19 ppm, 0.20 ppm-). The levels of SO₂, NO₂, SPM and visibility related to the incidences to some extent. When SO₂, NO₂ and SPM levels exceeded 0.07 ppm, 0.10 ppm and 0.2 mg/m³ respectively and visibility lowered 3 km in this region, the incidences clearly increased. High temperature and discomfort index, however, were not always connected with high incidences. In addition, the weather of days when high incidences were found was slightly cloudy, and in rainy or clear days such results were not at all seen.

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There are no large sources in Karatsu area except Karatsu steam power station, which consists of three units and has 1031 MW total output. Ninety nine per cent of oil consumption in Karatsu City is only occupied by the station. Consequently, the atmospheric pollution in the area shows a typical pattern brought about by a single large source. This report summarizes analysis of SO₂ pollution chiefly in the area in relation to the power station, and describes the administrative control against the station according to the analysis.
The purposes of the control are to lower average SO₂ concentration in the area as a whole, and to restrain short time high concentration in local area.
The means for the former is to reduce SO_X emission from the power station year by year with reduction of sulfur content in fuel oil or with stack gas sulfur removal systems. Since April 1976, the upper limitation of SO_X emission is up to 924 Nm³/hr which are equivalent to 0.6% fuel sulfur content. From September 1973 to August 1975 the annual average ambient SO₂ concentrations were 0.012 ppm and 6 hours in this period were in excess of hourly air quality standard for SO₂ at 11 monitoring stations in the area. The means for the latter is to guide the power station to change the fuel to low sulfur oil containing 0.5% or less sulfur under the following conditions. Namely, with every monitoring station when wind velocity at Shiyakusho station in City Hall, which is representative for wind in the air monitoring system, is 2.9 m/s or less, and with the stations situated within a semicircular of 90° in leeward of the power station when wind velocity is 3.0 m/s or above, condition 1: when SO₂ concentration of 0.051 ppm or above continues during 2 hours at any of those monitoring stations, condition 2: 0.051 ppm or above at 2 or more stations at the same time, condition 3: 0.071 ppm or above at any station.
As a result, the occurence of ambient SO₂ concentration of 0.051 ppm or above was 5.5 hours per month after the guidance compared with 11.7 hours per month before.

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