Urban and Regional Scale Air Pollution

Abstract

As advances in local emission control are made, the relative importance of background air pollution levels increases. Ship emissions in Osaka Bay were found to affect inland air quality relating to NO2 levels in Osaka City, while strong emissions of NOx and NMHC in developing regions on the Asian continent increased O3 levels in background air pollution in Japan. Emissions from metropolitan areas, on the other hand, can affect not only local but also global air quality. Transboundary air pollution, which impacts other cities, prefectures, and countries, should be considered in relation to recent local air pollution problems. These local and regional interactions should be taken into account for the future of air pollution control.