Airgas Included on 2010 Fortune 500 List

RADNOR, PA – April 15, 2010 -Airgas, Inc. (NYSE: ARG) today announced that it has been included on the 2010 FORTUNE 500 list. The FORTUNE 500 list is an annual ranking of all U.S. companies by revenue. The full list and related stories appear in the May 3 issue of FORTUNE, available on newsstands Monday, April 19, and now at fortune.com/500.

“Making the FORTUNE 500 list for the first time is a clear affirmation of our growth strategies, and a result of the hard work and dedication of our 14,000 Airgas associates,” said Airgas Chairman and CEO Peter McCausland.

Airgas was started in 1982 and generated $3 million of revenue in its first year. Since then, it has grown into a $4 billion company through organic growth and approximately 400 acquisitions. From the time of its initial public offering in December 1986, Airgas’ total shareholder return has exceeded 4,400%, or more than 18% compounded annually.

About Airgas, Inc.

Airgas, Inc. (NYSE: ARG), through its subsidiaries, is one of the nation's leading suppliers of industrial, medical and specialty gases, and hardgoods, such as welding equipment and related products. Airgas is a leading U.S. producer of atmospheric gases with 16 air separation plants, a leading producer of carbon dioxide, dry ice, and nitrous oxide, one of the largest U.S. suppliers of safety products, and a leading U.S. supplier of refrigerants, ammonia products, and process chemicals. Approximately 17,000 associates work in more than 1,100 locations, including branches, retail stores, gas fill plants, specialty gas labs, production facilities and distribution centers. Airgas also markets its products and services through e-Business, catalog and telesales channels. Its national scale and strong local presence offer a competitive edge to its diversified customer base. For more information, please visit www.airgas.com.

Investor Contact:

Joseph Marczely 610-263-8277

Media Contact:

Sarah Boxler 610-263-8260