FORM 5 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Form 3 Holdings Reported Form 4 Transactions Reported

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ANNUAL STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * MCCAUSLAND PETER 2. Issuer Name and Ticker or Trading Symbol AIRGAS INC [ARG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director __X__ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chairman of the Board and CEO (Last) (First) (Middle) C/O AIRGAS, INC., 259 N. RADNOR-CHESTER RD., STE. 100 3. Statement for Issuer's Fiscal Year Ended (Month/Day/Year) 03/31/2006 (Street) RADNOR, PA 19087 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Reporting (check applicable line) ___ Form Filed by One Reporting Person _X_ Form Filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned at end of Issuer's Fiscal Year (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Amount (A) or (D) Price Common Stock 06/17/2004   G 15,009 D $ (1) 7,239,457 (2) D   Common Stock 09/20/2005   G 12,723 D $ (1) 7,239,457 (2) (3) D   Common Stock 12/08/2005   G 42,856 D $ (1) 7,196,601 (2) D   Common Stock 01/11/2006   G 8,966 D $ (1) 7,147,635 (2) (4) D   Common Stock             41,500 (5) I Immediate Family Common Stock             42,314 (6) I 401(k) Plan

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SEC 2270 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned at End of Issuer's Fiscal Year (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
MCCAUSLAND PETER C/O AIRGAS, INC. 259 N. RADNOR-CHESTER RD., STE. 100 RADNOR, PA 19087	  X	  X	  Chairman of the Board and CEO	Â
MCCAUSLAND BONNIE F C/O AIRGAS, INC. 259 N. RADNOR-CHESTER RD. RADNOR, PA 19087	Â	  X	Â	Â

Signatures

Dean A. Bertolino, Attorney-in-Fact for Peter McCausland		05/11/2006
**Signature of Reporting Person		Date
Dean A. Bertolino, Attorney-in-Fact for Bonnie F. McCausland		05/11/2006
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Not applicable.
(2)	Includes 15,700 shares owned directly by Peter McCausland and indirectly by Bonnie F. McCausland.
(3)	The 12,723 shares of Airgas, Inc. common stock that are the subject of this gift by the Peter McCausland have been reflected as disposed of by the reporting person under column 5 of the reporting person's Form 4 filed on September 22, 2005.
(4)	Does not include 40,000 shares of Airgas, Inc. common stock transferred by Peter McCausland to his spouse, Bonnie McCausland, on December 15, 2005.
(5)	Includes 41,500 shares owned directly by Bonnie F. McCausland and indirectly by Peter McCausland.
(6)	The information presented is as of March 31, 2006, the date of the latest available statement of the reporting person's holdings of Airgas, Inc. common stock in his 401(k) plan. Since September 13, 2005, the date relied upon for the amount reported on Peter McCausland's Form 4 dated September 22, 2005, a total of 495 shares have been acquired in transactions exempt from Section 16(b) by Rule 19b-3(c).

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