<報文>光化学スモッグ多発時期における自動車排気ガス汚染レベルの推計 : 1970〜80年代にかけての炭化水素汚染の変化についての統計的考察

概要

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Since 1970 many works were continued about the photochemical smog phenomenon. However, the question on the serious sickness has not been resolved completely. The authors attempted for the problem to examine statistically a large number of the analytical data of hydrocarbons in the air in 1971～72 and in 1983. As a results of this, it was found that the distribution of the concentrations of hydrocarbons which were original pollutants to the smog was very different between the above two periods. That is, the previous average concentration was 2 times as high as that of the present, and the previous distribution curve, as logarithmic normal type, was more broadened than that of the present. Then, it was supposed that the exceedingly high concentrations of hydrocarbons occurred in the beginning of 1970. If the toxic derivatives over ppm were formed from hydrocarbons in the air, it would be possible that the serious sickness had happened with a certain probability. This theory is a conclusion led based on 2300 data of air samples.