The success of air pollution policy implementation depends on the achievement of air pollution policy goal and the attainment of air pollution policy intention. In general in the United States, the air pollution policy implementation has varied over time mainly due to the legal factor. It also has been influenced by the pressure of Congress on Administration and Administration’s demand toward the Congress. In the implementation process, the Court played a major role. Meanwhile, in Korea the role of Administration has been greater than that of Congress. The government has used regulation policy as a key tool and regarded result as a more important aspect than cause.