OSAKA — A 12-year air pollution suit was finally resolved Friday as residents of Amagasaki, Hyogo Prefecture, and the central government and an expressway operator formally settled the case at the Osaka High Court after the state pledged to take specific steps to reduce harmful vehicle emissions.

It is the first air pollution case in Japan in which the state has promised to implement concrete measures to reduce emissions of harmful substances. Earlier agreements in similar cases only urged the government to make efforts to reduce air pollution.

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