The development of fluegas desulfurization technologies picked up momentum in the late 1960s. The process can be carried out using both wet and dry systems. In 1967, trial runs of a dry system were conducted in Yokkaichi.Full-scale introduction of a desulfurizationfacility, however, did not take place until the late 1970s when a high-efficiency wet system was commercialized. This system played a vital role in helping companies cope with restrictions on theTotal Pollutant Load Control,thus contributing to a reduction in sulfur oxides (SOx) emissions.