Lafarge Cement UK says it has met an environmental improvement target seven years ahead of schedule. The company, which operates the Westbury works, has cut emissions of dust per tonne of cement made at its factories to less than 30 percent of the levels recorded in 1990.
Lafarge had set until 2013 to achieve the target, but announced the success in its annual environmental statement.
National environment manager Danny Lawrence said: "Continually improving all aspects of our environmental performance is a key priority. "We have achieved the cut in dust emissions through a combination of investing over £20m in new filtering systems and consistent, dedicated work by our employees."