Abstract
Based on two case studies, the process of large-scale transport of a polluted air mass northward of Tokyo is described. Comparison of oxidant concentrations with meteorological data reveals that the polluted air mass produced along the coastal area of Tokyo is transported about 200km by a low-level jet whose core is located around the 950mb level. The stable layer formed between the 800mb and 900mb levels also plays an important role in this process.
