Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

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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(Print or Type Responses)
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)
Executive Chariman
(Last)
(First)
(Middle)
C/O AIRGAS, INC., 259 N. RADNOR-CHESTER RD, STE. 100		 3. Date of Earliest Transaction (Month/Day/Year)
10/24/2012
(Street)

RADNOR, PA 19087		 4. If Amendment, Date 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
(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 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 07/16/2012   G V 109,784 (1) A (2) 7,121,139 (3) D  
Common Stock 10/24/2012   M   115,000 A $ 19.22 7,236,139 (3) D  
Common Stock 10/24/2012   M   115,000 A $ 21.15 7,351,139 (3) D  
Common Stock 10/24/2012   M   110,000 A $ 24.09 7,461,139 (3) D  
Common Stock 10/24/2012   M   100,000 A $ 36.17 7,561,139 (3) D  
Common Stock 10/24/2012   M   125,000 A $ 43.62 7,686,139 (3) D  
Common Stock 10/24/2012   M   125,000 A $ 60.84 7,811,139 (3) D  
Common Stock 10/24/2012   M   112,500 A $ 43.06 7,923,639 (3) D  
Common Stock 10/24/2012   M   55,000 A $ 62.23 7,978,639 (3) D  
Common Stock 10/24/2012   M   27,500 A $ 66.5 8,006,139 (3) D  
Common Stock 10/15/2012   G V 136,216 (4) D (2) 96,540 (5) I By trusts
Common Stock               48,583 (6) I By 401(k) plan
Common Stock               1,500 (7) I By immediate family

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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 Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: 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) $ 19.22 10/24/2012   M     115,000   (8) 05/12/2013 Common Stock 115,000 (2) 0 D  
Stock Option (Right to Buy) $ 21.15 10/24/2012   M     115,000   (9) 05/25/2014 Common Stock 115,000 (2) 0 D  
Stock Option (Right to Buy) $ 24.09 10/24/2012   M     110,000   (10) 05/24/2015 Common Stock 110,000 (2) 0 D  
Stock Option (Right to Buy) $ 36.17 10/24/2012   M     100,000   (11) 05/23/2014 Common Stock 100,000 (2) 0 D  
Stock Option (Right to Buy) $ 43.62 10/24/2012   M     125,000   (12) 05/08/2015 Common Stock 125,000 (2) 0 D  
Stock Option (Right to Buy) $ 60.84 10/24/2012   M     125,000   (13) 05/20/2016 Common Stock 125,000 (2) 0 D  
Stock Option (Right to Buy) $ 43.06 10/24/2012   M     112,500   (14) 05/19/2017 Common Stock 112,500 (2) 37,500 D  
Stock Option (Right to Buy) $ 62.23 10/24/2012   M     55,000   (15) 05/25/2018 Common Stock 55,000 (2) 55,000 D  
Stock Option (Right to Buy) $ 66.5 10/24/2012   M     27,500   (16) 05/17/2019 Common Stock 27,500 (2) 82,500 D  

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   Executive Chariman  
MCCAUSLAND BONNIE F
ERDENHEIM FARM
P.O. BOX 274
LAFAYETTE HILL, PA 19444		     X    

Signatures

 Robert H. Young, Jr., Attorney-in-Fact for Peter McCausland   10/26/2012
**Signature of Reporting Person Date
 Robert H. Young, Jr., Attorney-in-Fact for Bonnie F. McCausland   10/26/2012
**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) Represents shares of Airgas, Inc. common stock distributed to Peter McCausland and Bonnie McCausland (and held jointly) from two separate grantor retained annuity trusts (each, a "GRAT") of which Peter McCausland and Bonnie McCausland are co-trustees and either he or she is a beneficiary.
(2) Not applicable.
(3) Represents shares of Airgas, Inc. common stock, including shares issued upon the exercise of the stock options reported on Table II herein, jointly owned by Peter McCausland and Bonnie McCausland, except for 15,700 shares that are directly owned by Peter McCausland and indirectly owned by Bonnie McCausland.
(4) Represents shares of Airgas, Inc. common stock transfered as a gift from two separate GRATs of which Peter McCausland and Bonnie McCausland are co-trustees and either he or she is a beneficiary.
(5) Represents shares of Airgas, Inc. common stock held in two separate GRATs of which Peter McCausland and Bonnie McCausland are co-trustees and either he or she is a beneficiary.
(6) The information presented is as of 10/24/2012, the date of the latest available statement of Peter McCausland's holdings of Airgas, Inc. common stock in his 401(k) plan. Since 3/31/2012, the date of the statement relied upon for the amount reported on Peter McCausland's Form 5 dated 5/14/2012, a total of 418 shares of common stock have been acquired in Peter McCausland's 401(k) plan through transactions exempt under Section 16(b).
(7) Represents shares of Airgas, Inc. common stock owned directly by Bonnie McCausland and indirectly by Peter McCausland.
(8) These options became exercisable in 25% equal increments on each of 5/12/2004, 5/12/2005, 5/12/2006 and 5/12/2007.
(9) These options became exercisable in 25% equal increments on each of 5/25/2005, 5/25/2006, 5/25/2007 and 5/25/2008.
(10) These options became exercisable in 25% equal increments on each of 5/24/2006, 5/24/2007, 5/24/2008 and 5/24/2009.
(11) These options became exercisable in 25% equal increments on each of 5/23/2007, 5/23/2008, 5/23/2009 and 5/23/2010.
(12) These options became exercisable in 25% equal increments on each of 5/8/2008, 5/8/2009, 5/8/2010 and 5/8/2011.
(13) These options became exercisable in 25% equal increments on each of 5/20/2009, 5/20/2010, 5/20/2011 and 5/20/2012.
(14) These options became or will become exercisable, as applicable, in 25% equal increments on each of 5/19/2010, 5/19/2011, 5/19/2012 and 5/19/2013.
(15) These options became or will become exercisable, as applicable, in 25% equal increments on each of 5/25/2011, 5/25/2012, 5/25/2013 and 5/25/2014.
(16) These options became or will become exercisable, as applicable, in 25% equal increments on each of 5/17/2012, 5/17/2013, 5/17/2014 and 5/17/2015.

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