Severe level of photochemical oxidants (O_x) over the western coast of Japan during autumn after typhoon passing.

A recent report on Japanese local photochemical production found a decreasing trend in the 3-year average of the annual 99 th percentile of the daily maximum 8-h concentration (a new index for evaluating O x ), especially over the Kanto region (e.g., Tokyo) 12 , and this result suggested that transboundary O x pollution has an important effect over Japan.

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