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STUDY OF EVALUATION FOR INFLUENCE OF RAINFALL ON AIR POLLUTION DATA

Nowadays many types of damage by acid rain all over the world are reported. Concerned with the mechanism of the acid rain generation, the attempt to clarify the influence of the rainfall on the concentration of air pollution materials quantitatively was practiced. By Mann-Whitney's U test, it was practiced the significant test whether there was a significant difference of the concentration between rainy weather and non-rainy weather. The results are as follows;1) In rainy weather the SO2 concentration decreases 30-50 %, but in the case of NOX or CH4 there is no significant difference between both weathers.2) It is estimated that the decrease of the SO2 concentration is caused by the ascending current of the crowd generation.3) The rainfall in the night-time influences on the concentration more than in the day-time.