Ahlstrom's Barcelona plant, which manufactures products for advanced and transportation filtration businesses, has suffered from continued weakening demand in Southern Europe. Some 30 employees will be affected, starting from the second half of 2012.The plant, part of the Filtration business area, is one of the Ahlstrom's smallest production units. The plant has a saturator and a converter unit for materials used in transportation and advanced filtration applications.The measures taken by Ahlstrom to improve the efficiency at the plant have unfortunately not proved sufficient.