This paper investigates the relation between an export processing zone and a pollution quota in a small country. The model suppose that the pollution target is implemented with a marketable permit system, and the government sets the quota to maximize domestic welfare. Then we show that, if an increase in real income reduces marginal external damage, the pollution quota is relieved by the formation of an export processing zone. However, if the marginal damage is augmented with an increase in the income, the optimal quota might be strengthened by the formation of the zone.