Airgas, Inc. (NYSE: ARG) announced today that Executive Chairman Peter McCausland has sold a total of 1.2 million shares of Airgas common stock in a privately-negotiated overnight block trade. McCausland sold the shares in connection with personal financial planning matters, including tax planning and the repayment of debt incurred to exercise a significant number of Airgas stock options in recent years and hold the resulting shares. Following the sale, McCausland’s beneficial ownership of Airgas’ common stock was approximately 7 million shares. 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. More than 15,000 employees work in approximately 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 eBusiness, 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.