Detection of local structure of yellow sand

The air pollution is the serious situation in East Asia. It is detected remarkably by the observations of suspended particulate matters. Yellow sand was observed conventionally in the district. On recent years, the yellow sand interacts with industrial waste gas and becomes polluted dust and goes over the border. We observed the yellow sand by using digital dust meters, and found that the yellow sand had local structures whose width was 6-75 km. This is narrower than that of a common sense. Passage times of the maximum parts of the peaks are less than 30 min. The maximum values are about 200 [mug/m³]. The yellow sand interacts with the vapor. The interactions are estimated by neural network analysis using optical SPM observations and meteorological measurements. We estimated some yellow sand peaks and showed different characters of each peaks.