Substantial environmental investments have been competed at the Tornio stainless steel plant, as a result of which the plant’s emissions will be significantly reduced, even though steel production will more than double. The most recent environmental investments are the construction of a new dust filter unit at melt shop 1 and the closure of smelter roof openings. Similarly, a new dust filter unit, representing the latest technology, has been completed at the hot rolling mill. The total cost of these investments was EUR 22 million. During the last four years, over EUR 100 million has been spent on improving environmental protection in connection with the expansion of the Tornio stainless steel plant. The introduction of the new particle cleaners means that the Tornio stainless steel plant’s most significant emissions to air, i.e. particles, will be cut to around half of present levels, despite a doubling of steel production.