Beginning in the 1930s, the city became known for the "Tacoma Aroma," a distinctive, acrid odor produced by pulp and paper manufacturing on the industrial tide flats. In the late 1990s, Simpson Tacoma Kraft reduced total sulfur emissions by 90%. This largely eliminated the problem; where once the odor was ever-present, it is now only noticeable occasionally downtown, primarily when the wind is coming from the east. The mill produces pulpwood and linerboard products; previously owned by St. Regis the mill was sold to RockTenn in 2014. The mill's name changed yet again in 2016 to WestRock.