EAJ (Environment Agency of Japan) is now investigating the release of hydrocarbon vapors into the atmosphere. It is anticipated that broad legislation will soon be enacted to limit this source of pollution. Some local self-governing bodies have already been regulating facilities discharging hydrocarbon vapors, such as storage tanks, transfer facilities, gas stations, etc.From an above point of view, here represent how these regulations stand, how hydrocarbon vapors release in all the petroleum industry, what preventive measuesr are effective, and what hydrocarbon recovery equipments are on the market.