Ambient measurements of PM 10 levels in Taiwan over East Asia have shown unusual decreases for the 1994-2002 period. To assess these downward trends of PM 10 , we develop methods for calculating climatologies of PM 10 and airstreams, and a new method for quantifying airstreams and their associated impacts on PM 10 and PM 10 -influencing factors. These methods were verified against anomalously low PM 10 levels during the 1998 ENSO, and anomalously high PM 10 levels during spring 2000. Calculations show the…
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