Plume rises from four various scale plant were observed.
As the results of comparision with observed plume rises and calculated ones from various formula, it was obtained that Priestley's formula showed the features of observed plume rise.
Still for obtaining more agree ment with observed and calculated values, experimental plume rise equation based on Priestley's formula was obtained for neutral stability condition.
Z=AQu^-ξ
Where A is proportional constant, and Q the heat emission from stack, the function of heat emission ξgiven by ξ=1/4 (2m+3), where m is m=2.7Q^-0.6.

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Reactions between some hydrocarbons and nitrogen monoxide, pollutants in air, have been investigated in the ionization chamber of a mass spectrometer as ion-molecule reactions, A Nier type mass spectrometer with a 14-cm radius of curvature was used by rising the pressure in the ionization chamber to about 10^-2 mmHg.
A gas mixture of specified hydrocarbons and nitrogen monoxide was prepared in a gas reservoir of the sample introduction system. The hydrocarbons were methane, ethane, propane, ethylene and propyrene with purities higher than 99%. For the mixutre of methane and nitrogen monoxide, a new peak of m/e 45 was observed which did not appear in the single system of methane or nitrogen monoxide. And, at the same time, those peaks due to methane itself decreased. Similar results were obtained with the other mixtures. New peaks of m/e 59 for ethane, m/e 45, 59 for propane and m/e 59 for ethylene and propyrene became greater with the pressure of nitrogen monoxide.
These ions were formed probably by the reactions between fragment ions of hydrocarbons and nitrogen monoxdie, or vice versa, and these corresponded to CH₃NO⁺ for m/e 45 and C₂H₅NO⁺ for m/e 59.

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Polycyclic aromatic hydrocarbons associated with particulates in Osaka Air were determined by Gas Chromatogrphy. Samples were collected at four sites in Osaka City during the period of June 1968 to February 1969. Concentrations of sixteen polycyclic aromasic hydrocarbons in 59 samples were obtained.
According to the results of the determination, the annual average concentration of sixteen polycyclic aromatic hydrocarbons was 370-500μg/1000 m³ air, 1300-1600 μg/g particulates, and 3, 4-benzpysene was 30-60 μg/1000 m³ air, 100-180μg/g particulates.
In the urban air, seasonal difference was found in both the amount of polycyclic hydrocarbons and 3, 4-benzpyrene, and their concentrations in winter were about double what they were in summer.
In air pollution due to automobile exheust gas, remarkable annual variation was not found.
The Bap/B [ghi] P and Bap/Cor ratios are as follows:
Urban Air Bap/B [ghi] P=1.52-1.67
Automobile Exhaust Gas Bap/B [ghi] P=1.05
Urban Air Bap/Cor=5.80-6.48
Automobile Exhaust Gas Bap/Cor=3.15
These data are thought to be available as indicators to presume the sources of air pollution.

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