At the same time as stack heights were being raised, measures to deal directly with soot and dustwere also being implemented, and devices such as electrostatic dust collectors gradually became popular.
Further, Japan's first flue gasdenitrationfacilityfor removing nitrogen oxides(NOx) from soot and smoke was installed in Yokkaichi in 1975 and was later adopted by other companies.
In 1987, the use of Liquefied Natural Gas(LNG), which contains almost no sulfur,was begun at large-scale urban facilities. Since then, its use has spread far and wide across Japan.