Washington Mills AS is operating according to emission limits for SO2 and dust given by KLIF (Climate and Pollution Agency) in 2005. Reduced SO2-emission has been achieved by using low sulphur petroleum coke, while the dust limits have been reached by changed operational routines. The dust emissions are measured continously, enabling us to do further improvements. Equipment for measuring Suspended Matter to water is also a continous operating process. Long term air quality measurements in the neighbouring area show that the respirable dust and SO2 levels have been reduced substantially since 1998. The levels are well below the environmental norms in EU both concerning average and maximum values.