Information on the relative contributions of various types of hydrocarbon pollution sources is required by pollution control strategists.
Factor analysis was applied to hydrocarbons pollution which was reported in our emvironmental survey in the SAKAI littoral industrial and suburban area. As a result, four common factors were obtained from 20 variable data. These were; automobilies, two large factories in the SAKAI littoral industrial area and a photochemical factor. Further, a statistical estimation of the relative contributions of various types of hydrocarbon pollution sources was obtained from the results of the factor analysis.

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A gas chromatographic method is presented for the determination of C₂ to C₁₁ hydrocarbons in ambient air. The method detected 78 indivisual peaks in chromatograms of ambient air which represented well over 200 paraffinic, olefinic, and aromatic hydrocarbons.
Factor analysis was applied to olefinic and aromatic hydrocarbons pollution. As a result, two common factors were obtained from 24 variable data. These were; photochemistry and a scale factor. Further, a statistical estimation of the photochemistry was obtained from the results of the factor analysis. Consequently, the statistical estimation was found to agree well with the reactivities of hydrocarbons in nitric oxide photooxidation as reported by William A. Glasson.

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The transportation process of nitrogen dioxide in the atmosphere can not be simulated only by a general diffusion model, because of the chemical activity of nitrogen dioxide.
The great part of nitrogen oxides (NOx) emitted in the atmosphere is nitric oxide originally. Nitric oxide and ozone react mainly, to convert nitric oxide to nitrogen dioxide rapidly in the atmosphere.
In this study, a simple empirical formula to estimate nitrogen dioxide concentration was proposed, where nitrogen oxides, emission intensity, and background ozone concentration were used as independent variables. It is assumed that the background concentrations of nitric oxide, nitrogen dioxide, and ozone are uniform, and those are in chemical equilibrium in the atmosphere.
The procedure of model identification is as follows.(i) To get the numerical solution for several conditions of the diffusion equation which contains reaction terms.(ii) To identify several empirical formulas which hold to a good approximation for the numerical solution.(iii) To examine the characteristics of those formulas.

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Advanced slide type analytical calculator for stack gas analysis has been developed. Calculations on stack gas analysis can be made by this calculator. Calculate items are flue gas quantity which is calculated from the fuel consumption and oxygen content, pollutants emission (SO_x, NO_x) in flue gas, concentration of pollutants in fule gas, effective stack height, exchange of concentration between ppm and mg/Nm3, correction of concentration of pollutants, moisture content in flue gas, etc.

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