SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* MCCAUSLAND PETER (Last) (First) (Middle) C/O AIRGAS, INC. 259 N. RADNOR-CHESTER ROAD, SUITE 100 (Street) RADNOR PA 19087 (City) (State) (Zip)	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
	3. Date of Earliest Transaction (Month/Day/Year) 05/16/2005
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

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 Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/16/2005		M		7,736	A	$13.32	8,267,189(1)	D
Common Stock	05/16/2005		M		64,264	A	$13.32	235,340(2)	I	Trust FBO Children
Common Stock	05/16/2005		M		72,000	A	$17.31	307,340(2)	I	Trust FBO Children
Common Stock	05/03/2005		J		374,356(3)	D	(4)	1,500(5)	I	Immediate Family
Common Stock								41,704(6)	I	401(k) Plan

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 Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (Right to Buy)	$13.32	05/16/2005		M			7,736	(7)	05/22/2005	Common Stock	7,736	(4)	0	D
Stock Option (Right to Buy)	$13.32	05/16/2005		M			64,264	(7)	05/22/2005	Common Stock	64,264	(4)	0	I	Trust FBO Children
Stock Option (Right to Buy)	$17.31	05/16/2005		M			72,000	(7)	05/22/2005	Common Stock	72,000	(4)	0	I	Trust FBO Children

1. Name and Address of Reporting Person* MCCAUSLAND PETER (Last) (First) (Middle) C/O AIRGAS, INC. 259 N. RADNOR-CHESTER ROAD, SUITE 100 (Street) RADNOR PA 19087 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer X Director X 10% Owner X Officer (give title below) Other (specify below) Chairman of the Board and CEO

1. Name and Address of Reporting Person* MCCAUSLAND BONNIE F (Last) (First) (Middle) C/O AIRGAS, INC. 259 N. RADNOR-CHESTER ROAD, SUITE 100 (Street) RADNOR PA 19087 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. Includes 15,700 shares owned directly by Peter McCausland and indirectly by Bonnie F. McCausland.

2. Represents shares held in a trust for the benefit of the Reporting Persons' children.

3. These shares of Arigas, Inc. common stock are held by the Reporting Persons' children in two separate trusts where each child is the settlor, beneficiary and a trustee of his or her respective trust. Neither of the Reporting Persons is a trustee of either trust. On May 3, 2005, each trust was amended to eliminate each child's power to vote, dispose of or direct the disposition of the shares held in trust. Each of the Reporting Persons disclaims beneficial ownership of these securities and this report shall not be deemed to be an admission that either of them is the beneficial owner of such securities.

4. Not applicable.

5. Includes 1,500 shares owned directly by Bonnie F. McCausland and indirectly by Peter McCausland.

6. The information presented is as of 4/8/2005, the date of the latest available statement of the reporting person's holdings of Airgas, Inc. common stock in his 401(k) plan. Since 2/9/2005, the date relied upon for the amount reported on the reporting person's February 15, 2005 Form 4, a total of 512 shares have been acquired in transactions exempt from Section 16(b) by Rule 16b-3(c).

7. These options are fully exercisable.

Remarks:

	Todd R. Craun, Attorney-in-Fact for Peter McCausland	05/18/2005
	Todd R. Craun, Attorney-in-Fact for Bonnie F. McCausland	05/18/2005
	** Signature of Reporting Person	Date
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