Opinion for the Court filed PER CURIAM.
PER CURIAM:
This litigation embodies a challenge to the leasing by the General Services Administration (GSA) of the Great Plaza area of the Federal Triangle in Washington, D. C., for use as a parking facility for employees of federal agencies.1 Two grounds of attack are advanced. One is that the National Environmental Policy Act of 1969 (NEPA)2 requires an environmental impact statement (EIS) prior to leasing. The other is that GSA is violating the Public Buildings Amendments of 19723 by charging the [415] employee only a portion of the commercial parking rate and assessing the difference to the employee’s agency.
Appellants are the Committee for Auto Responsibility and the Metropolitan Washington Coalition for Clean Air,4 two organizations whose purposes include improvement of the quality of the environment, together with three individuals who live and attend school in the District of Columbia. The Great Plaza area is owned by the Federal Government, and since the 1930’s has been leased to parking management firms for periods of approximately four years.5 It is now leased to Parking Management, Inc., a private corporation, for a four-year term that began on May 15,1976.6 Under the current lease, nearly three-fourths of the parking spaces are reserved during business hours for the use of permit-holding federal employees. Since 1972, permits have been assigned only to employees who carpool.7
The District Court denied appellants’ request for declaratory and injunctive relief and dismissed their action.8 They now assert that procedural and substantive errors infected the proceedings before that court. GSA opposes their arguments and insists further that appellants lack standing. Perceiving no reversible error, we affirm.
I. STANDING
To possess standing to attack GSA’s failure to prepare an EIS, appellants must show that they have been “adversely affected” or “aggrieved” within the meaning of Section 10 of the Administrative Procedure Act (APA).9 That section confers standing only upon those to whom the challenged agency conduct has caused actual injury to an interest within the zone of interests protected by the statute allegedly violated.10 Section 10 calls additionally upon a party to allege an “injury that fairly can be traced to the challenged action of the defendant, and not injury that results from an independent action of some third party not before the court.” 11
A person suffering legal wrong because of agency action, or adversely affected or aggrieved by agency action within the meaning of a relevant statute, is entitled to judicial review thereof.
[416] We think appellants have satisfied standing requirements to charge violations of NEPA but not of the Public Buildings Amendments of 1972.12 Appellants claim that they or their members 13 live in or near the District of Columbia and regularly travel to educational, cultural and recreational facilities within the immediate vicinity of the Great Plaza. They assertedly are affected by noise, air pollution and congestion from vehicles utilizing the Great Plaza parking lot.14 Harm to health and conservational interests of parties seeking judicial review is enough to meet the injury-in-fact test for standing,15 and interests of those sorts are clearly within the zone of protection afforded by NEPA.16
Appellants have shown, moreover, that their injury can be traced to GSA’s [417] failure to prepare an EIS.17 Their complaint avers that had GSA done so, it would have had to assess the adverse environmental effects of leasing the Great Plaza area under an arrangement offering parking spaces to federal employees for fees less than commercial rates.18 In its EIS, GSA would also have had to consider alternatives to the leasing agreement,19 such as charging permit holders a commercial rate for parking, offering subsidies to those who use mass transit, or restricting the area to non-parking uses.20 Such an approach, according to appellants’ complaint, would have ensured that the use of the Great Plaza does not contribute unnecessarily to noise and air pollution in the surrounding area. These allegations are sufficient to confer standing upon appellants to challenge GSA’s omission of an EIS.
To litigate their remaining claim, it was incumbent upon appellants to show that they have been “adversely affected” by GSA’s alleged violations of the Public Buildings Amendments of 1972. While appellants have urged that their health and conservational values are similarly diminished by GSA’s failure to exact commercial parking rates from federal employees,21 it seems clear that these asserted losses fall well outside the zone safeguarded by the Amendments.22 The purpose of the Amendments is to provide the Government with an economical and efficient system for the procurement, utilization and disposal of property.23 Health and conseryational concerns, which indubitably underlie NEPA, are not among those that Congress arguably sought to accommodate by enactment of the Public Buildings Amendments of 1972. We hold that appellants do not have standing to challenge the asserted infringement of the Amendments.24
II. THE DISTRICT COURT’S PROCEDURES
Appellants charge the District Court with procedural error, stating that it did not treat GSA’s motion to dismiss as a [418] motion for summary judgment. They argue that whenever a federal trial court considers matters outside the pleadings in ruling on a motion to dismiss, the motion must be treated as one for summary judgment.25 Appellants also point to GSA’s failure to file its motion to dismiss at least ten days prior to what it says was a hearing thereon.26
We have no quarrel with appellants’ view of adjective law. But, contrary to appellants’ position,27 the session held by the District Court was devoted to appellants’ motion for a preliminary injunction and the merits of its case for a permanent injunction,28 matters previously consolidated for hearing.29 The court thus did not deal with GSA’s motion to dismiss, but rather examined the relief appellants sought, denied their request, and finding none other appropriate to grant, properly dismissed the complaint.30
Moreover, appellants have not alleged any prejudice resulting from the course taken by the District Court. All parties were given three weeks’ notice of the consolidation,[419] 31 and must have understood that the hearing on the preliminary and permanent injunctive relief was meant to be their final day in court.32 Appellants’ argument of reversible procedural error must be rejected.
III. THE LEASE AND MAJOR FEDERAL ACTION
The central issue on appeal is whether GSA’s decision to lease the Great Plaza area to a parking management firm was a major federal action significantly affecting the environment.33 GSA, in an “environmental analysis”34 prepared before it entered into the 1976 lease, found that “[t]he continued use of the Great Plaza Parking Lot will not degrade air quality from the present level, since the pollutants generated by the cars using the parking lot are already included in the present level.” 35 GSA concluded that “[t]he leasing of the Great Plaza Parking Lot to a parking management firm for a period of four years, is not considered to be a major Federal action which would significantly affect the quality of the human environment.”36 Appellants respond by contending that the approximately 1,800 vehicles utilizing the lot daily contribute pollutants that significantly degrade local air quality.37 Since “GSA’s [parking] program continues to harm the [420] environment,” appellants maintain, an EIS must be prepared even though the leasing arrangement is a continuing project.38
An agency commencing federal action has the initial and primary responsibility for ascertaining whether an EIS is required 39 An initial agency determination on this matter is judicially vulnerable only when the agency has abused its discretion or has acted arbitrarily.40 This standard of review notwithstanding, a court is obligated to make sure that the agency took a “hard look” at the environmental consequences of its decision.41
In the instant case, we cannot say that GSA acted unreasonably in con-eluding that its decision to lease the Great Plaza area to a parking management firm was not major federal action significantly affecting the environment. We are informed that GSA ascertains the parking needs at each federal building and project on a case-by-case basis,42 and that if GSA determines that an EIS must be developed in any specific instance, the parking plans for that project will be considered in the EIS.43 An agency decision to consider jointly the environmental consequences of a federal project and its adjacent parking facility is not an unreasonable interpretation of the NEPA mandate.44
The duty to prepare an EIS normally is triggered when there is a proposal [421] to change the status quo.45 GSA has clearly shown in the information provided in its environmental analysis 46 that current leasing of the Great Plaza area to a parking management firm does not alter the status quo ante.47 Without a change in parking policy concerning the Great Plaza area there is no proposal for major federal action significantly affecting the environment.48
To compel GSA to formulate an EIS under these circumstances would trivialize NEPA’s EIS requirement and diminish its utility in providing useful environmental analysis for major federal actions that truly affect the environment. NEPA’s call for an EIS is governed by the rule of reason,49 and that rule was not transgressed by GSA’s failure to prepare an EIS prior to leasing the Great Plaza area to a parking management firm in 1976.
IV. THE PUBLIC BUILDINGS AMENDMENT OF 1972
As we have stated, appellants also charge that the GSA parking program at Great Plaza violates Section 490(j) of the Public Buildings Amendments of 197250 by allocating parking fees between federal employees and their respective agencies.51 Appellants argue that the full fee should be paid by employees because, they say, as “users” of the parking spaces they must pay appropriate commercial charges to comply with Section 490(j).52 We have held that appellants lack standing to challenge violations of this legislation.53 We now add, alternatively, that there is no merit in their contentions.
GSA disagrees with appellants’ reading of Section 490(j), and its interpretation is entitled to great weight in a review[422] ing court.54 The deference owed an agency’s construction of a statute it administers is heightened when, as in this case, the agency was actively involved in the drafting and adoption of the statutory language.55
GSA’s implementation of Section 490(j) means that each agency is required to pay GSA the prevailing commercial rate for space utilized by that agency’s employees, and each employee is obligated to pay the parking management firm a fee which reflects the cost of management and operation of his space.56 Such an approach is a reasonable interpretation of Section 490(j), particularly in light of its legislative history, which reveals that the congressional purpose pervading passage of the Public Buildings Amendments of 1972 was to make government agencies accountable for the space they utilize and to prevent agencies from demanding space in excess of their needs.57
[423] We find no merit in appellants’ allegations that GSA, in leasing the Great Plaza area to a parking management firm, violated either NEPA or the Public Buildings Amendments of 1972. The judgment of the District Court is accordingly
Affirmed.
[t]o declare a national policy which will encourage productive and enjoyable harmony between man and his environment; to promote efforts which will prevent or eliminate damage to the environment and biosphere and stimulate the health and welfare of man; to enrich the understanding of the ecological systems and natural resources important to the Nation; and to establish a Council on Environmental Quality.
42 U.S.C. § 4321 (1976). NEPA ordains that all agencies of the Federal Government shall
. include in every recommendation or report on proposals for legislation and other major Federal actions significantly affecting the quality of the human environment, a detailed statement by the responsible official on—
(i) the environmental impact of the proposed action,
(ii) any adverse environmental effects which cannot be avoided should the proposal be implemented,
(iii) alternatives to the proposed action,
(iv) the relationship between local short-term uses of man’s environment and the maintenance and enhancement of long-term productivity, and
(v) any irreversible and irretrievable commitments of resources which would be involved in the proposed action should it be implemented.
42 U.S.C. § 4332(2)(C) (1976).
It is the intent of the Congress in enacting this legislation to provide for the Government an economical and efficient system for (a) the procurement and supply of personal property and nonpersonal services . .; (b) the utilization of available property; (c) the disposal of surplus property; and (d) records management.
40 U.S.C. § 471 (1976).
Section 4 of the Public Buildings Amendments of 1972, 40 U.S.C. § 490(j), (k) (1976), added two new subsections to the 1949 Act. Only subsection (j) bears on the instant litigation, and it states:
The Administrator is authorized and directed to charge anyone furnished services, space, quarters, maintenance, repair, or other facilities (hereinafter referred to as space and services), at rates to be determined by the Administrator from time to time and provided for in regulations issued by him. Such rates and charges shall approximate commercial charges for comparable space and services.
[415] 40 U.S.C. § 490(j) (1976).
The prerequisites to associational standing are clearly met in this litigation. Committee for Auto Responsibility and Metropolitan Washington Coalition for Clean Air allege that health and conservational values of their members have been impaired by GSA’s failure to prepare an EIS. See notes 14-16 infra and accompanying text. These values to members are interests germane to the objectives of both organizations. See note 4 supra. The declaratory and injunctive relief sought by these two organizations does not require individualized proof, and can be properly resolved in a group context.
Aesthetic and environmental well-being, like economic well-being, are important ingredients of the quality of life in our society, and the fact that particular environmental interests are shared by the many rather than the few does not make them less deserving of legal protection through the judicial process.
Sierra Club v. Morton (Mineral King), supra note 10, 405 U.S. at 734, 92 S.Ct. at 1366, 31 L.Ed.2d at 643.
it is the continuing responsibility of the Federal Government to use all practicable means, . . . [to] assure for all Americans safe, healthful, productive, and aesthetically, and culturally pleasing surroundings [and] attain the widest range of beneficial uses of the environment without degradation, risk to health or safety, or other undesirable and unintended consequences
42 U.S.C. § 4331(b)(2), (3) (1976).
Plaintiffs ask for an injunction against the assignment and the effectiveness of the assignment of the parking places of the Great Plaza lot. Those issues are moot since both the assignment and the effectiveness of the assignment have been accomplished.
They also ask that all parking in the lot be enjoined. As our papers point out, there is no legal basis for doing so.
Tr. at 10, App. for Appellants at 13.
Appellants’ reliance on Fed.R.Civ.P. 12(b), therefore, is misplaced since the applicability of the rule is triggered only when a court considers a party’s motion to dismiss and reaches a decision thereon. See Carter v. Stanton, 405 U.S. 669, 92 S.Ct. 1232, 31 L.Ed.2d 569 (1972), cited by appellants, where the Court remanded the case because the trial court, at a preliminary hearing on a motion to dismiss, received matters outside of the pleadings.
There will be a continuation of the temporary adverse impacts relative to the operation of the Parking Lot. These impacts will last as long as the site is used as a parking lot; and are primarily a continuation of pollutants contributed to air quality by the vehicles using the parking lot and a continuation of the congestion on surrounding streets contributed to the vehicles using the parking lot.
Environmental Analysis, App. 24.
Appellants urge, in the alternative, that even if operation of the Great Plaza parking lot is not major federal action, then the “federal parking program as a whole” must be action of that character, since the cumulative effect of all federal parking lots will have a significant impact on the environment. Brief for Appellants at 17. The record, however, does not support appellants’ claim that GSA has a national or areawide parking plan, and that is a matter beyond the range of judicial notice. Such a plan would be a necessary predicate for NEPA’s requirement of an E1S. See Kleppe v. Sierra Club, 427 U.S. 390, 96 S.Ct. 2718, 49 L.Ed.2d 576 (1976), where the Court held that a regional EIS on coal-related operations is not required if a regional plan or program does not exist. The Court stated that
respondents’ desire for a regional environmental impact statement cannot be met for practical reasons. In the absence of a proposal for a regional plan of development, there is nothing that could be the subject of the analysis envisioned by the statute for an impact statement.
Id. at 401, 96 S.Ct. at 2726, 49 L.Ed.2d at 585. Moreover, even if a national or areawide parking program did exist, appellants have failed to show federal “action” taken with respect to that program. See note 2 supra.
The determination of the region, if any, with respect to which a comprehensive statement is necessary requires the weighing of a number of relevant factors, including the extent of the interrelationship among proposed actions and practical considerations of feasibility. Resolving these issues requires a high level of technical expertise and is properly left to the informed discretion of the responsible federal agencies. . . . Absent a showing of arbitrary action, we must assume that the agencies have exercised this discretion appropriately.
Kleppe v. Sierra Club, supra note 37, 427 U.S. at 412, 96 S.Ct. at 2731, 49 L.Ed.2d at 591 (citation omitted). See also Vermont Yankee Nuclear Power Corp. v. National Resources Defense Council, 435 U.S. 519, 554-555, 98 S.Ct. 1197, 1217, 55 L.Ed.2d 460, 486 (1978); Calvert Cliffs Coordinating Comm. v. United States Atomic Energy Comm’n, 146 U.S.App.D.C. 33, 39, 449 F.2d 1109, 1115 (1971); Hanly v. Kieindienst, 471 F.2d 823, 828-829 (2d Cir. 1972), cert. denied, 412 U.S. 980, 93 S.Ct. 2290, 36 L.Ed.2d 974 (1973); Nucleus of Chicago Home Owners Ass’n v. Lynn, 524 F.2d 225, 229-230 (7th Cir. 1975), cert. denied, 424 U.S. 967, 96 S.Ct. 1462, 47 L.Ed.2d 734 (1976); Robinson v. Kneble, supra note 16, 550 F.2d at 427.
The Administrator of General Services has congressional authorization to maintain and operate governmental buildings, and to exact payment for the' utilization of services and space by other federal agencies:
Whenever and to the extent that the Administrator has been or hereafter may be authorized by any provision of law other than this subsection to maintain, operate, and protect- any building, property, or grounds situated in or outside the District of Columbia, including the construction, repair, preservation, demolition, furnishing, and equipment thereof, he is authorized in the discharge of the duties so conferred upon him
to obtain payments, through advances or otherwise, for services, space, quarters, maintenance, repair, or other facilities furnished, on a reimbursable basis, to any other Federal agency . . . and to credit such payments to the applicable appropriation of the General Services Administration.
40 U.S.C. § 490(a) (1976).
GSA was actively involved in framing language for the Public Buildings Amendments of 1972. On August 4, 1971, GSA submitted to the Speaker of the House a draft of legislation proposing amendment of two statutes — the Public Buildings Act of 1959 and the Federal Property and Administrative Services Act of 1949 — to
require using agencies to budget and pay for the use of space and related services and to authorize the General Services Administration, subject to conventional Congressional and Executive controls, to finance its public buildings operations from the receipts arising therefrom.
Requiring all agencies to finance the cost of the space they occupy is consistent with the performance budgeting concept under which total program costs are reflected in the cost accounts of the program agency .
Section 4 would authorize the Administrator to establish such charges for the property management services provided other agencies. This would be accomplished by adding a new subsection (j)(l) to section 210 of the Property Act which concerns the operation of buildings and related activities.
H.R.Rep.No.989, 92d Cong., 2d Sess. 11-13 (1972); reprinted in [1972] U.S.Code Cong. & Admin.News, pp. 2370, 2375.
H.R. 10488, as reported, would require Government departments and agencies to [423] pay user charges for the space they occupy in GSA-operated buildings. Such user charges would be deposited into the buildings fund. .
When the fund proposed in the bill is implemented, each agency would have to budget for its space needs, just as it now budgets for its personnel, travel, and other administrative costs. This would promote more efficient, more economical use of space by Government agencies. . . . Making
agencies accountable for the space they use should result in more efficient space utilization by agencies.
H.R.Rep.No.989, 92d Cong., 2d Sess. 7-8 (1972), reprinted in [1972] U.S.Code Cong. & Admin.News, pp. 2372-2373. Similar language was found in the Senate report:
Last, it is apparent to the committee that, at least in part, the government’s current space problem may be attributed to a misallocation of existing office space among the Federal agencies. The G.S.A. presently bears the budgetary responsibility for the cost of the office space occupied by most of the Executive branch. Since the departments and agencies themselves are not assessed in their individual budgets for the value of the space which they occupy, they have little incentive to conserve. Instead, the tendency is for agencies to request from G.S.A. more space than they legitimately need, and then to hoard it. Aside from the fact that an accurate performance budget is defeated unless agencies are held accountable for all of their costs, the diseconomies of the present arrangement are clear.
S.Rep.No.412, 92d Cong., 1st Sess. 4 (1971).