Vaisala Oyj Boulder/Helsinki, July 24, 2008 - Vaisala, a global leader in environmental and industrial measurement, has been selected by the Cleantech Group(TM), LLC to join its prestigious Cleantech Index (CTIUS) of public clean technology companies. CTIUS is a stock market index intended to reflect the surging global demand for cleantech products and services.

Cleantech products are defined as knowledge-based products and services that add economic value by reducing cost, raising productivity and/or product performance while reducing resource consumption and their negative impact on the environment and public health. The Cleantech Index is comprised of stocks of publicly traded companies worldwide that are leaders in cleantech innovation and commercial deployment across a broad range of industry sectors: from alternative energy and energy efficiency to advanced materials, clean air & water, ecofriendly agriculture/nutrition, clean manufacturing, and more.

Only 76 companies globally have qualified for the Index so far, of them approximately half are non-US based. Vaisala now joins this elite group that must meet 18 screening criteria just to be shortlisted for selection - including profitability, growth, environmental impact, industry leadership, intellectual property, strategy, management quality, liquidity, and more.

There are several investment funds that track the Cleantech Index, such the PowerShares Cleantech ETF (PZD) and the KSM Cleantech ETF in Israel (KSMCTIUS).

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Further information: Helena Marjaranta, Communications Director, tel. +358 9 8949 2832, helena.marjaranta (a) vaisala.com (Helsinki, Finland)

Cleantech Index: http://www.cleantechindex.com/

Vaisala is a global leader in environmental and industrial measurement, providing services, products and solutions for meteorology, environmental sciences, aviation, traffic and industry. Built on science-based innovation, advanced technology and over 70 years of experience, Vaisala is committed to providing a better quality of life through environmental measurement. Headquartered in Finland, Vaisala employs over 1100 professionals and is listed on the Nordic Exchange, Helsinki. www.vaisala.com

Vaisala Oyj

http://www.vaisala.com

ISIN: FI0009900682

Stock Identifier: XHEL.VAI

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