[NSI LOGO]


PRESS RELEASE

                                                     INVESTOR RELATIONS CONTACT:
                                                     CHESTER J. POPKOWSKI (CHET)
                                                          SENIOR VICE PRESIDENT,
                                          CHIEF FINANCIAL OFFICER, AND TREASURER
                                                                  (404) 853-1205
                                               WEB SITE: www.nationalservice.com

                                 APRIL 2, 2003

                                       NSI
                                       ---
                   NSI ANNOUNCES AGREEMENT TO BE ACQUIRED BY
               CALIFORNIA INVESTMENT FUND, LLC FOR $10.00 / SHARE

                         REPORTS SECOND QUARTER RESULTS
                                      ---

ATLANTA -- National Service Industries, Inc. (NYSE: NSI) today announced that it
has entered into a definitive merger agreement providing for the acquisition of
NSI by an affiliate of California Investment Fund, LLC, a private investment
firm based in San Diego, California. Pursuant to the agreement, each outstanding
share of NSI common stock will be converted into the right to receive $10.00 in
cash.

        The transaction originated with an unsolicited offer to NSI by
California Investment Fund, LLC. The Board of Directors of NSI has unanimously
approved and adopted the merger agreement. SunTrust Robinson Humphrey is serving
as financial advisor to NSI.

        The closing of the transaction is subject to the approval of the NSI
stockholders, the receipt of certain financing, and other customary conditions.
Commitment letters have been obtained with respect to all necessary financing in
connection with the transaction. The transaction is expected to close around
midyear in calendar year 2003. Prior to the closing of the transaction, NSI is
authorized under the terms of the merger agreement to receive and consider any
alternative third-party proposals with respect to the acquisition of NSI.

        NSI's businesses will continue to operate under the names National Linen
 Service and Atlantic Envelope Company, and no significant operational or
 management changes are expected at the business-unit level. Brock A. Hattox,
 Chairman and Chief Executive Officer of NSI, intends to make his previously
 announced retirement effective upon consummation of the transaction.

        "Given the highly competitive industries in which we compete and the
escalating costs of operating a public company of our relatively small size,
management and the board of directors believe strongly that this transaction
represents an excellent value for NSI stockholders," said Hattox, who became CEO
following the spin-off of NSI's lighting and specialty chemical businesses to
Acuity Brands, Inc. in December 2001. "It also continues the operations of NSI's
market-leading operating companies in ways that should be seamless for
employees, suppliers and customers."

                               2ND QUARTER RESULTS

        The Company also reported financial results today for the second quarter
 ended February 28,2003. Second quarter revenues totaled $121.4 million, down 8
 percent from last year's $132.0 million. Net loss for the quarter was $5.2
 million, or $0.49 per diluted share, compared to last year's break-even
 results.

        The decrease from last year's results is primarily attributable to lower
 direct mail and credit card solicitation envelope volumes, pricing pressures
 and lower volumes in the textile rental industry.

                             TEXTILE RENTAL SEGMENT

        Textile rental segment second quarter revenues of $76.1 million
 decreased 1.5 percent from last year's $77.3 million. The reduction in revenues
 is primarily attributable to the sale of the San Diego business in the first
 quarter and the discontinuance of a significant health care segment customer at
 the end of the fourth quarter last year. Additionally, volumes per customer
 continue to be impacted by soft economic conditions. Operating loss for the
 quarter was $1.5 million compared to last year's reported profit of $1.3
 million. Last year's results included approximately $700 thousand of net gains
 from a previously divested business and restructuring plans. The decrease in
 operating results for 2003 is largely due to lower revenues; increased employee
 benefits costs; one-time restructuring gains in 2002; and unfavorable results
 from several under-performing linen plants.

                                ENVELOPE SEGMENT

        The envelope segment second quarter revenues of $45.3 million represent
 a 17.2 percent decline from last year's $54.7 million and an operating loss of
 $2.1 million compared to last year's profit of $649 thousand. Operating results
 decreased largely as a result of the volume reduction.

                          CORPORATE AND INTEREST COSTS

        Corporate expenses were $4.0 million for the second quarter compared to
 last year's $1.9 million due primarily to costs associated with the previously
 announced retirement of the Company's chairman.

        For the Company's second fiscal quarter ended February 28, 2003, the
Company failed to comply with two financial covenants in the Company's $40.0
million unsecured credit facility, which resulted in an event of default under
the credit agreement. The covenants in question require the Company, as of the
end of each fiscal quarter, to maintain a minimum ratio of Income Available For
Fixed Charges to Fixed Charges for the preceding four consecutive fiscal
quarters and a minimum amount of Stockholders' Equity (as such terms are defined
in the credit agreement). On March 28, 2003, the lender agreed to waive the
event of default pursuant to an agreement that will require the Company to
obtain the lender's approval of any additional borrowings under the credit
facility. As of February 28, 2003 and the date of this release, there were $11.4
million of letters of credit issued under the credit facility, but no other
borrowings outstanding under the credit facility. The credit facility is
expected to be terminated upon consummation of the proposed merger.

        Additionally, during the quarter ended February 28, 2003, the Company
 engaged external consulting economists to review the Company's expected future
 asbestos claims liabilities. Based on information supplied by this study and
 management's knowledge and experience regarding its asbestos liabilities, the
 Company concluded that an increase in its accrued liabilities for asbestos
 related costs was necessary. The increase in the liabilities resulting from
 this review process was a minimum increase of $138.0 million to a maximum
 increase of $209.0 million. Management does not believe any amount in the range
 is more probable than any other. Therefore, as of February 28, 2003, the
 Company increased its liabilities for asbestos related costs by approximately
 $138.0 million, the low end of the range. The Company also believes it has
 adequate insurance coverage available to cover this increase in liabilities and
 therefore recorded an additional insurance recovery asset of $138.0 million.

        Management continues to monitor claims activity, credit worthiness of
 insurers, the status of lawsuits (including settlement initiatives),
 legislative developments and costs incurred in order to ascertain whether an
 adjustment to the existing accruals should be made to the extent that
 historical experience may differ significantly from the Company's underlying
 assumptions. As additional information becomes available, the Company will
 reassess its liability and revise estimates as appropriate.

        "Conditions in our markets worsened since we reported our first quarter
 results. Although Atlantic Envelope remains the preferred vendor for a number
 of large financial

services companies, volumes have dropped significantly due to consumer concerns
over elevated personal debt levels and the uncertainty of the general economy.
Business travel has not recovered from the pre-September 11th levels, placing
significant pricing pressure on the fine dining and lodging markets served by
National Linen Service. This pressure has limited the ability to increase prices
to offset the increased costs of labor, benefits, insurance and fuel. In
addition, the inclement weather experienced during the quarter only made our
challenges greater," said Hattox. "Given this difficult operating environment,
we are continuing to focus our resources on improving our selling efforts,
resizing our operations, implementing cost reductions and improving our
operating efficiency."

                               FIRST HALF RESULTS

        First half revenues of $241.5 million decreased 9.4 percent over the
 same period a year ago. Net loss for the first six months of the fiscal year
 was $7.1 million, or $0.68 per diluted share, compared to a net loss of $28.8
 million, or $2.80 per diluted share, in the first six months of 2002. Excluding
 the loss from discontinued operations of $7.5 million, or $0.73 per share, and
 the cumulative effect of a change in accounting principle for goodwill
 impairment of $17.6 million or $1.71 per share, loss from continuing operations
 for the first half of fiscal 2002 totaled $3.7 million, or $0.36 per diluted
 share.

        "In December, we estimated that, absent any further economic
 deterioration, NSI would incur losses in the first half and experience a
 profitable second half, resulting in estimated full-year net earnings of
 between break-even and $3.0 million," Hattox said. "As we begin the stronger
 half of our fiscal year we anticipate returning to profitability for the third
 and fourth quarters. However, given the uncertainty of the general economy,
 conditions are too cloudy at this time to affirm or continue to furnish
 full-year guidance."

                                 CONFERENCE CALL

        The Company will host a conference call on April 2, 2003 at 4:00 p.m. ET
 to discuss the transaction and the second quarter results. This call will be
 web cast live at the NSI website: www.nationalservice.com. A replay of the call
 will also be posted to this site within two hours of the completion of the
 conference call and will be archived on the site for three weeks.

                     INFORMATION ON THE SALE OF THE COMPANY

        NSI will file a copy of the definitive merger agreement with the
 Securities and Exchange Commission (SEC) as an exhibit to a Current Report on
 Form 8-K.

        In connection with NSI's solicitation of proxies with respect to its
 special meeting of stockholders concerning the proposed merger, NSI will file a
 proxy statement with the SEC and furnish NSI stockholders with a copy of the
 proxy statement. NSI stockholders will be able to obtain a free copy of the
 proxy statement (when available) and other relevant documents filed with the
 SEC from the SEC's website at www.sec.gov. NSI stockholders may also obtain a
 free copy of the proxy statement and other documents (when available) by
 directing a request by mail or telephone to National Service Industries, Inc.,
 1420 Peachtree Street, Atlanta, Georgia 30309, Attention: Investor Relations,
 Telephone: (404) 853-1228.

        AS IN ALL PROXY MATTERS, THE PROXY STATEMENT SHOULD BE READ CAREFULLY
 BEFORE MAKING A DECISION CONCERNING THE MERGER. NSI STOCKHOLDERS ARE URGED TO
 READ THE PROXY STATEMENT AND ANY OTHER RELEVANT DOCUMENTS RELATING TO THE
 PROPOSED MERGER WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT
 INFORMATION.

        NSI and its directors may be deemed to be "participants" in the
 solicitation of proxies from NSI stockholders in favor of the merger agreement.
 Information regarding the persons who may be considered "participants" in the
 solicitation of proxies will be set forth in the proxy statement when it is
 filed with the SEC. Information regarding certain of these persons is also set
 forth in the Schedule 14A filed by NSI on November 22, 2002 with the SEC.

                                      * * *

        National Service Industries, Inc., with fiscal year 2002 sales of $530
million, has two business segments -- textile rental and envelopes.

                                      * * *


        Certain information contained in this press release constitutes
forward-looking statements within the meaning of the Private Securities
Litigation Reform Act of 1995. Such forward-looking statements are inherently
uncertain and involve risks. Statements that are not historical facts, including
statements about management's estimates, beliefs and expectations, are
forward-looking statements. These statements include, among others, statements
regarding the expected timing of the closing of the merger transaction with
California Investment Fund, LLC and the outlook for the Company's future
operating and financial results. Forward-looking statements are only predictions
and are not guarantees of performance. These statements are based on
management's beliefs and assumptions, which in turn are based on currently
available information. Important assumptions relating to the forward-looking
statements include, among others, the timely satisfaction of the conditions set
forth in the Merger Agreement, including the receipt of all necessary financing
to complete

the Merger, assumptions regarding expected outcomes of pending litigation and
dispute resolution, the expected costs of pending and future asbestos claims,
the solvency of NSI's insurers and the resolution of allocation and coverage
issues with those insurers on a basis consistent with management's current
expectations, competitive conditions in the Company's businesses, the economic
effects of war and acts of terrorism, and general economic conditions. These
assumptions could prove inaccurate. Forward-looking statements also involve
risks and uncertainties, which could cause actual results to differ materially
from those contained in any forward-looking statement. Many of these factors are
beyond NSI's ability to control or predict. Such factors include, but are not
limited to, (a) delays in the receipt of necessary financing and third party and
governmental consents to complete the Merger, (b) unexpected developments or
outcomes in NSI's legal proceedings, (c) the risk of additional insolvencies
among NSI's insurance carriers or coverage disputes with carriers, and (d) the
risk of an increase or acceleration in the number of asbestos-related claims
filed against NSI. NSI does not undertake any obligation to publicly update or
revise any forward-looking statements because of new information, future events
or otherwise.

                                     * * *

NATIONAL SERVICE INDUSTRIES, INC.
Condensed Consolidated Balance Sheets (unaudited)
(amounts in thousands)




                                                                        FEBRUARY 28,  August 31,
                                                                            2003         2002
                                                                        ------------  ----------
                                                                                
ASSETS
Current Assets:

  Cash and Cash Equivalents                                               $  9,478     $ 20,969
  Receivables, net                                                          50,100       52,198
  Inventories and Linens in Service                                         66,736       67,843
  Insurance Receivable                                                      95,483       42,024
  Other Current Assets                                                      12,034        5,779
                                                                          --------     --------
    Total Current Assets                                                   233,831      188,813
                                                                          --------     --------

Property, Plan and Equipment, net                                          141,150      147,956
Insurance Receivable                                                       216,886      140,831
Other Assets                                                                41,247       41,498
                                                                          --------     --------

TOTAL ASSETS                                                              $633,114     $519,098
                                                                          ========     ========

LIABILITIES AND STOCKHOLDERS' EQUITY
Current Portion of Litigation Accrual                                     $ 82,849     $ 41,288
Other Current Liabilities                                                   57,496       64,548
Long-Term Debt and Capital Lease Obligations, Less Current Maturities          885          984
Deferred Income Taxes                                                       11,770        7,853
Litigation Accrual, less Current Portion                                   249,414      166,844
Other Long-Term Liabilities                                                 17,297       16,948
Stockholders' Equity                                                       213,403      220,633
                                                                          --------     --------
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY                                $633,114     $519,098
                                                                          ========     ========


Condensed Consolidated Cash Flows (unaudited)
(amounts in thousands)



                                                            SIX MONTHS ENDED
                                                       --------------------------
                                                       FEBRUARY 28,  February 28,
                                                           2003          2002
                                                       ------------  ------------
                                                               
CASH PROVIDED BY (USED FOR):

Operations-
  Net loss from continuing operations                    $ (7,083)     $ (3,689)
  Depreciation and amortization                            12,902        12,530
  Other operating activities                              (14,796)       (8,948)
  Net cash provided by discontinued operations                 --         6,935
                                                         --------      --------
    Cash (Used for) Provided by Operations                 (8,977)        6,828
                                                         --------      --------
Investing-
  Purchases of property, plant and equipment               (4,478)      (10,607)
  Sale of property, plant and equipment                       441           705
  Acquisitions                                               (356)          (60)
  Divestitures                                              4,784         1,062
  Other investing activities                                   --          (149)
                                                         --------      --------
    Cash Provided by (Used for) Investing Activities          391        (9,049)
                                                         --------      --------
Financing-
  Repayments of capital lease obligations                     (91)           --
  Repayments of long-term debt, net                        (2,077)        8,590
  Treasury stock transactions, net                            156           679
  Cash dividends                                             (893)       (7,048)
                                                         --------      --------
    Cash (Used for) Provided by Financing Activities       (2,905)        2,221
                                                         --------      --------

Net Change in Cash and Cash Equivalents                   (11,491)           --
Cash and Cash Equivalents at Beginning of Period           20,969            --
                                                         --------      --------
Cash and Cash Equivalents at End of Period               $  9,478           $--
                                                         ========      ========

Asbestos Claims Summary

                                                                   YEAR-TO-DATE
                                                             ----------------------
                                                               2003           2002
                                                             --------      --------
                                                                     
Open Claims Pending, August 31,                                35,300        35,000
  Served                                                       19,700         4,900
  Dismissed                                                    (3,500)      (11,300)
  Settled                                                     (12,300)       (2,800)
                                                             --------      --------
Open Claims Pending, February 28,                              39,200        25,800
  Claims settled but not yet finalized                         (9,700)       (2,800)
                                                             ========      ========
                                                               29,500        23,000
                                                             ========      ========

CCR claims settled but not yet finalized                        7,000         7,900
Year to date average resolution indemnity cost per claim     $  2,262      $    880
                                                             ========      ========


NATIONAL SERVICE INDUSTRIES, INC.
Summary of Operations (unaudited)
(amounts in thousands, except per-share data)




                                                         THREE MONTHS ENDED           SIX MONTHS ENDED
                                                     --------------------------  --------------------------
                                                     FEBRUARY 28,  FEBRUARY 28,  FEBRUARY 28,  FEBRUARY 28,
                                                        2003           2002         2003          2002
                                                     ------------  ------------  ------------  ------------
                                                                                   
Sales and Service Revenues:
  Textile rental                                      $  76,142     $  77,335     $ 152,234     $ 156,171
  Envelope                                               45,307        54,703        89,278       110,256
                                                      ---------     ---------     ---------     ---------
    Total Operating Revenues                            121,449       132,038       241,512       266,427
                                                      ---------     ---------     ---------     ---------

Operating Profit (Loss):
  Textile rental                                         (1,454)        1,342        (3,560)       (4,037)
  Envelope                                               (2,139)          649        (3,078)        2,803
                                                         (3,593)        1,991        (6,638)       (1,234)
  Corporate                                              (3,950)       (1,892)       (3,999)       (4,636)
  Interest expense, net                                      47           168            48           279
  Loss from continuing operations before
    taxes and cumulative effect of a change in
    accounting principle                                 (7,590)          (69)      (10,685)       (6,149)
  Income tax benefit                                     (2,431)          (28)       (3,602)       (2,460)
  Loss from continuing operations before
    cumulative effect of a change in accounting
    principle                                            (5,159)          (41)       (7,083)       (3,689)
Discontinued Operations:
  Income from discontinued operations, net of tax            --            --            --        11,534
  Costs associated with effecting spin-off, net of
    tax benefit                                              --            --            --       (19,069)
Cumulative effect of a change in accounting
  principle, net of tax benefit                              --            --            --       (17,602)
                                                      ---------     ---------     ---------     ---------
Net Loss                                                ($5,159)         ($41)      ($7,083)      ($8,826)
                                                      =========     =========     =========     =========

Basic and Diluted EPS:
Loss from continuing operations before
    cumulative effect of a change in accounting
    principle                                            ($0.49)       ($0.00)       ($0.68)       ($0.36)

Discontinued Operations:
  Income from discontinued operations, net of tax            --            --            --          1.12
  Costs associated with effecting spin-off, net of
    tax benefit                                              --            --            --         (1.85)
Cumulative effect of a change in accounting
  principle, net of tax benefit                              --            --            --         (1.71)
                                                      ---------     ---------     ---------     ---------
Net Loss                                                 ($0.49)       ($0.00)       ($0.68)       ($2.80)
                                                      =========     =========     =========     =========

Basic weighted-average shares outstanding
  during period                                          10,436        10,317        10,402        10,310
Diluted weighted-average shares outstanding
  during period                                          10,436        10,317        10,402        10,310
Dividends paid per share                              $    0.04     $    0.04     $    0.08     $    0.68
Actual shares outstanding end of period                   11,186        10,946