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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1. Name and Address of Reporting Person * Stark Ronald J   2. Issuer Name and Ticker or Trading Symbol AIRGAS INC [ARG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Senior VP - Sales/Marketing (Last) (First) (Middle) C/O AIRGAS, INC., 259 N. RADNOR-CHESTER RD, STE. 100 3. Date of Earliest Transaction (Month/Day/Year) 05/31/2013 (Street) RADNOR, PA 19087 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ 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 05/31/2013   M   1,800 A $ 43.62 7,171 (1) (2) (3) D   Common Stock 05/31/2013   M   8,250 A $ 43.06 15,421 (1) (2) (3) D   Common Stock 05/31/2013   S   10,050 D $ 103.49 (4) 5,371 (1) (2) (3) D

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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)

$ 43.62

05/31/2013

M

1,800

(5)

05/08/2015

Common Stock

1,800

(6)

0

D

Stock Option (Right to Buy)

$ 43.06

05/31/2013

M

8,250

(7)

05/19/2017

Common Stock

8,250

(6)

4,550

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Stark Ronald J C/O AIRGAS, INC. 259 N. RADNOR-CHESTER RD, STE. 100 RADNOR, PA 19087			Senior VP - Sales/Marketing

Signatures

Robert H. Young, Jr., Attorney-in-Fact for Ronald J. Stark		06/04/2013
**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)	Includes 749 shares of Airgas, Inc. common stock acquired pursuant to Airgas Inc.'s Employee Stock Purchase Plan ("ESPP") as of 05/31/2013, the date of the latest available statement of the reporting person's ESPP holdings. Since 12/10/2012, the date of the statement relied upon for the amount reported on the reporting person's 12/12/2012 Form 3, a total of 181 ESPP shares have been acquired in transactions exempt from Section 16(b).
(2)	On 12/24/2012, the reporting person transferred 1,165 shares of Airgas, Inc. common stock from his ESPP account to a brokerage account owned by him.
(3)	On 01/28/2013, the reporting person transferred 182 shares of Airgas, Inc. common stock from his ESPP account to a brokerage account owned by him.
(4)	This price represents the average selling price (within a range of $103.00-$103.72) of the shares of common stock of Airgas, Inc. sold by the reporting person, as provided by the reporting person's broker.
(5)	Options became exercisable in 25% equal increments on each of 5/08/2008, 5/8/2009, 5/8/2010 and 5/8/2011.
(6)	Not applicable.
(7)	Options became exercisable in 25% equal increments on each of 5/19/2010, 5/19/2011, 5/19/2012 and 5/19/2013.

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