Abstract
NOx and voc emission have been reduced during past decade, however, the number of high Ox days has not decreased in Osaka area. In this study, we executed a series of numerical simulation of photochemical air pollution by using WRF/Chem under the typical mid-summer condition, and investigated the distribution of photochemical regime and characteristic of some photochemical indicators which can be used as a reference of regulation policy making. We also investigated the effect of current voc reduction policy. It was found that the most of Osaka area is VOC-sensitive, so the current voc reduction policy will be effective in reducing photochemical Ox in the area, however, environmental quality standard for Ox cannot be achieved solely by this regulation.
