X0202 4 2008-03-10 0000804212 AIRGAS INC ARG 0000908893 MCCAUSLAND PETER C/O AIRGAS, INC. 259 N. RADNOR-CHESTER RD, STE. 100 RADNOR PA 19087 1 1 1 0 Chariman, President and CEO Common Stock 2007-06-15 5 G 0 350000 D 6901910 D Common Stock 2007-08-07 5 G 0 7549 D 6894361 D Common Stock 2007-12-11 5 G 0 18729 D 6875632 D Common Stock 2008-01-31 5 G 0 7114 D 6868518 D Common Stock 2008-03-10 4 M 0 130000 15.94 A 6998518 D Common Stock 250000 I By Trusts Common Stock 41500 I By immediate family Common Stock 43707 I By 401(k) plan Stock Option (Right to Buy) 15.94 2008-03-10 4 M 0 130000 A 2008-05-14 Common Stock 130000 0 D Includes 250,000 shares transferred on 6/15/2007 to two separate grantor retained annuity trusts of which Peter McCausland is a co-trustee and either he or his spouse is a beneficiary. Not applicable. Includes 15,700 shares owned directly by Peter McCausland and indirectly by his spouse. Represents 250,000 shares held in two separate grantor retained annuity trusts of which Peter McCausland is a co-trustee and either he or his spouse is a beneficiary. Represents 41,500 shares owned directly by his spouse and indirectly by Peter McCausland. The information presented is as of 03/07/2008, the date of the latest available statement of the reporting person's holdings of Airgas, Inc. common stock in his 401(k) plan. Since May 3, 2007, the date of the statement relied upon for the amount reported on the reporting person's Form 4 dated May 7, 2007, a total of 510 shares of common stock have been acquired in the reporting person's 401(k) plan through transactions exempt under Section 16(b). These options became exercisable in 25% equal increments on each of 5/14/1999, 5/14/2000, 5/14/2001 and 5/14/2002. Robert H. Young, Jr., Attorney-in-Fact for Peter McCausland 2008-03-12