Abstract
As the study of air pollution progressed, the aim of research moved from pollutant concentration measurements in highly contaminated areas (e.g., emission sources and their vicinity) to long-range transportation and its wide-area influence. Presently, air pollution in Japan is measured by monitoring stations distributed around the country. This type of monitoring is based on point sampling, and it is difficult to grasp the general features of the region in question from it. In order to obtain these features, temporally and spatially continuous measurement for a wide area is required. Remote monitoring methods meet this requirement, and provide new information on the atmosphere, as well as the two-dimensional distribution of pollutants near the ground. In Japan, populated areas are separated by mountain ranges, and the long-range transportation of urban plumes from Tokyo to its suburbs [1], for example, in the scale of 50 to 100 km, indicates the desired detection range of the remote monitoring.
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