Ahlstrom Corporation STOCK EXCHANGE RELEASE 22.04.2010 at 10.30 Ahlstrom Corporation will publish its interim report for January-March 2010 on Thursday, April 29, 2010 approximately at 12 a.m. Finnish time. Ahlstrom's President & CEO Jan Lång and CFO Seppo Parvi will present the 2010 first quarter results in Finnish at a press and analyst conference in Helsinki on April 29, 2010, at 2:00 p.m. Finnish time. The conference will take place at Event Arena Bank, address Unioninkatu 20, 2(nd) floor. The name of the meeting room will be displayed on the display board in the lobby. In addition, a conference call for analysts and investors will be held in English on April 29, 2010, at 4:00 p.m. Finnish time. To participate in the teleconference, please dial +358 (0)9 2319 4345 in Finland or +44 (0)20 7136 2051 in UK a few minutes before the conference begins. The confirmation code is 8978241. The event can also be viewed as a live audio webcast at www.ahlstrom.com. Registration is required. It is possible to participate in the Q & A session via teleconference or online. An on-demand audio webcast of the conference will be available on Ahlstrom's website for twelve months after the call. The presentation material will be available at www.ahlstrom.com > Investors > Reports and presentations > 2010 after the interim report has been published. Ahlstrom Corporation Niina Suhonen Vice President, Corporate Communications For further information, please contact: Heli-Kirsti Airisniemi Financial Communications Manager, tel. +358 10 888 4731 Distribution: NASDAQ OMX Helsinki Main media www.ahlstrom.com <http://www.ahlstrom.com_/> Ahlstrom in brief Ahlstrom is a global leader in the development, manufacture and marketing of high performance nonwovens and specialty papers. Ahlstrom's products are used in a large variety of everyday applications, such as filters, wipes, flooring, labels, and tapes. Based upon its unique fiber expertise and innovative approach, the company has a strong market position in several business areas in which it operates. Ahlstrom's 5,800 employees serve customers via sales offices and production facilities in more than 20 countries on six continents. In 2009, Ahlstrom's net sales amounted to EUR 1.6 billion. Ahlstrom's share is quoted on the NASDAQ OMX Helsinki. The company website is at www.ahlstrom.com. [HUG#1406711]