Sierra Club v. Larson

                UNITED STATES COURT OF APPEALS
                    FOR THE FIRST CIRCUIT
                                         

No. 92-2227

                     SIERRA CLUB, ET AL.,

                   Plaintiffs, Appellants,

                              v.

                  THOMAS D. LARSON, ET AL.,

                    Defendants, Appellees.

                                        

No. 92-2323

                     SIERRA CLUB, ET AL.,

                   Plaintiffs, Appellants,

                              v.

                  THOMAS D. LARSON, ET AL.,

                    Defendants, Appellees.

                                          

        APPEALS FROM THE UNITED STATES DISTRICT COURT

              FOR THE DISTRICT OF MASSACHUSETTS

       [Hon. Edward F. Harrington, U.S. District Judge]
                                                      

                                         

No. 92-2282

                     SIERRA CLUB, ET AL.,

                         Petitioners,

                              v.

                     JULIE BELAGA, ETC.,

                         Respondent.

                                         

               PETITION FOR REVIEW OF AN ORDER

            OF THE ENVIRONMENTAL PROTECTION AGENCY

                                         

                            Before

                    Boudin, Circuit Judge,
                                         
               Campbell, Senior Circuit Judge,
                                             
                  and Stahl, Circuit Judge.
                                          

                                         

Thomas  B. Bracken  with  whom Bracken  & Baram  was on  brief for
                                               
appellants.
George B.  Henderson, II, Assistant  United States Attorney,  with
                        
whom  Myles  E.  Flint,  Acting Assistant  Attorney  General,  A. John
                                                                  
Pappalardo,  United States  Attorney,  Robert L.  Klarquist, Attorney,
                                                       
Department  of  Justice,  Michael   Kenyon,  Attorney,  United  States
                                      
Environmental Protection Agency, Judith Tracy, Attorney, United States
                                         
Environmental Protection Agency and Irwin Schroeder, Attorney, Federal
                                               
Highway  Administration,   were  on  joint  brief   of  appellees  and
respondent, for federal appellees.
William  L. Pardee,  Assistant Attorney  General, Commonwealth  of
                  
Massachusetts,   with  whom   Scott  Harshbarger,   Attorney  General,
                                            
Commonwealth  of Massachusetts, was  on joint  brief of  appellees and
respondent, for state appellees.

                                         

                        August 6, 1993
                                         

     BOUDIN, Circuit Judge.   In this  case, the Sierra  Club
                          

appeals  from the judgment of the district court declining to

enjoin construction of the central artery/third harbor tunnel

project in Boston.  It also petitions to review the action of

the Environmental Protection Agency in approving an amendment

to  Massachusetts  state  regulations  that  bears  upon  the

project.   We affirm the district court and deny the petition

for review.

              I. THE FACTS AND PRIOR PROCEEDINGS

     Massachusetts, through its  Department of Public  Works,

has  begun construction  of a  mammoth project  that includes

rebuilding a  major segment of  Interstate Route 93  that now

runs on a  viaduct through  downtown Boston and  is known  as

"the central artery."  When the central artery/tunnel project

is  completed some  years  from now,  the highway  segment in

question will be widened, sunk below ground level, and mostly

covered.  It  will connect  at the  north with  a new  bridge

across the Charles River and at the south with a newly  built

third  harbor  tunnel  running  from South  Boston  to  Logan

Airport in East Boston.

     The depressed and covered portion of the new highway and

the  tunnel will  be  ventilated by  ducts  and fans  in  six

buildings located  on the highway  route and near  the tunnel

portals.   Vast amounts of air will be drawn into the covered

highway  and tunnel, and the mixture of air and motor vehicle

                             -3-

emissions will be  pumped up  through the  six buildings  and

exhausted  through stacks ranging  from 90 to  225 feet high.

Studies  indicate  that  the  project  will  reduce   traffic

congestion,  increase  average speeds,  and  reduce area-wide

carbon monoxide and hydrocarbon emissions.

     The  Sierra  Club,  a  non-profit  environmental  group,

believes that whatever the  area-wide effects of the project,

it will create new "hot spots" of pollution in certain of the

neighborhoods near  to the six ventilation buildings.  In its

view, pollution  control equipment,  in the nature  of after-

burners,  should be  installed in the  ventilation buildings.

The federal and  state governments, which have  filed a joint

brief in this case, deny that any dangerous hot spots will be

created,  pointing  to  studies  conducted  as  part  of  the

project's environmental review.  They also assert that after-

burner  technology  is  not   feasible  because  of  the  low

concentration of pollutants in the vented air.

     In  March  1991,  the Sierra  Club  and  certain  of its

members  who  live  in the  vicinity  of  the central  artery

brought  suit in district court against a collection of state

and  federal  officials associated  with  the  project.   The

gravamen of the  suit was  the Sierra Club's  claim that  the

ventilation buildings  planned  for the  project comprised  a

"major stationary  source" of air  pollution as that  term is

used in the  Clean Air Act,  42 U.S.C.    7401, et seq.,  and
                                                       

                             -4-

counterpart Massachusetts regulations,  310 C.M.R.   7.00  et
                                                             

seq.   It is common ground that, if the ventilation buildings
   

were so classified,  then the project would  require a permit

or permits from Massachusetts that have not been secured.  To

frame this issue entails a brief description of the statute.

     The Clean  Air Act  enacted a complex  statutory regime,

several times amended, to  control and mitigate air pollution

in  the  United States.   Broadly  speaking,  Title I  of the

statute  regulates stationary sources  of pollution and Title

II regulates mobile sources, most importantly motor vehicles.

For  specified pollutants, national air quality standards are

promulgated  by  EPA.    42  U.S.C.     7409.    Whether  new

construction of polluting facilities is permitted in an area,

and what  kind of controls  are required, depends  on whether

the area is below  or above the standard for  each pollutant.

Part C,  42 U.S.C.     7470-7492,  governs permits where  the

standard  has  been attained;  Part  D  applies to  so-called

nonattainment areas.  Id.    7501-7515. 
                        

     In  either  event, the  construction  of  a "major"  new

stationary source--normally, one emitting 100 or more tons of

pollutant  each  year,  see 42  U.S.C.     7602(j)--generally
                           

requires  a permit.  42 U.S.C.     7475(a), 7502(c)(5).1   In

                    

     1The definition  of "major stationary source" in section
7602(j) directly governs permits under part  D where the same
phrase is  used in  section 7502(c)(5)'s  permit requirement.
Part  C  requires  permits  for  specified  "major   emitting
facilities," in  areas already  in compliance  with pollution

                             -5-

the case of  Boston, some  of the pollutants  that will  flow

through  the proposed ventilation  buildings currently exceed

national standards so  that new major sources  are subject to

the more stringent class of limitations; other pollutants are

below the standards and less stringent limitations apply.  By

way of example, the Boston area exceeds the national standard

for  carbon  monoxide, and  to  secure a  permit  the highway

proponents would have to show that a  major stationary source

can achieve  the "lowest  achievable emission rate"  for that

pollutant.  42 U.S.C.   7503(a)(2).

     The  Clean Air Act  allocates different responsibilities

to the EPA  on the one hand  and to the states on  the other.

Each  state  is  directed to  adopt  and  submit  to EPA  for

approval a state implementation  plan to achieve and maintain

the  national standards  established  by EPA.    42 U.S.C.   

7410(a).  See also  id.    7471, 7502.  If the state fails to
                      

adopt  an  approvable  plan,   the  EPA  must  adopt  federal

regulations   for   the  area.      42   U.S.C.      7410(c).

Massachusetts  has an  approved  state  implementation  plan.

Under  the Clean Air Act,  "citizen" suits may  be brought to

enjoin  a project that requires  a permit under  Parts C or D

but has not obtained one.  42 U.S.C.   7604(a)(3).

                    

standards, 42 U.S.C.    7475, 7479,  but--with qualifications
not  here  relevant--the  statute instructs  that  the  terms
"major stationary  source" and "major  emitting facility"  be
used interchangeably.  42 U.S.C.   7602(j).

                             -6-

     In  this case, in April 1991 the Sierra Club and certain

of  its  members  sought  a  preliminary  injunction  against

construction of the  central artery and tunnel  project.  The

request was  denied on July 30, 1991.   After transfer of the

case to  another judge,  the district court  received further

briefing  and argument.    On September  16, 1992,  the court

granted  summary   judgment  in   favor  of   the  government

defendants, state and  federal, holding that the  ventilation

buildings did not comprise stationary sources subject to pre-

construction permit  requirements.   The Sierra Club  and its

named members appealed.

     Shortly before the lawsuit, the Massachusetts Department

of  Environmental   Protection  submitted   to  the   EPA  on

January 30, 1991, a new regulation--regulation 7.38, codified

as  310  C.M.R.     7.38--as  a  proposed  amendment  to  the

Massachusetts  state  implementation plan.    This regulation

seeks  to classify  tunnel  ventilation systems  as "indirect

sources" under the Clean  Air Act.   In the early 1970s,  the

EPA  had begun  to  require that  state implementation  plans

regulate  such  facilities  as  parking  lots,  highways  and

garages that  do not  emit pollutants themselves  but attract

numbers of polluting vehicles.  Congress responded in 1977 by

barring the EPA from regulation of what were called "indirect

                             -7-

sources."  42 U.S.C.   7410(a)(5)(B).2   However, Congress at

the same time gave  the states permission, if they  so chose,

to regulate such indirect sources themselves as part of their

state implementation plans.  Id.    7410(a)(5)(A), (C).  
                               

     Massachusetts, exercising this option through regulation

7.38,    proposed   to  regulate  roadway/tunnel  ventilation

systems   as  indirect   sources.      The  regime   involves

certification   by  the  builder   that  specified  pollution

standards will  be met,  and the Department  of Environmental

Protection may  accept, conditionally approve,  or reject the

certification after  notice and  hearing.   Monitoring  after

construction and  periodical renewal  of the certificate  are

required.  The  new regulation also  states that the  systems

are not  subject to the pre-construction  permitting required

for  various  stationary sources  under regulation  7.02, 310

C.M.R.   7.02.

     The Sierra Club opposed  the approval of regulation 7.38

when Massachusetts submitted it to the EPA as an amendment to

the state implementation plan.   The Sierra Club  argued that

the  effect would  be indirectly  to  relieve the  project at

issue  in this  case of  the more  stringent pre-construction

                    

     2To the  extent that a  highway or other  major indirect
source  is federally  assisted, the  EPA retains  some direct
regulatory authority,  see 42 U.S.C.    7410(a)(5)(B); but no
                          
claim has  been made  that  the project  in this  case is  in
violation of any requirements laid down by the EPA under this
reservation.

                             -8-

approval required of major stationary sources under the Clean

Air  Act  and the  Massachusetts  regulations  that apply  to

stationary  sources.   After  notice  and  receipt of  public

comments, the EPA on October 8, 1992, published notice of its

approval,  57 Fed. Reg. 46310  (1992).  The  Sierra Club then

petitioned  for review  of  the EPA's  action  in this  court

pursuant to 42 U.S.C.   7607(b)(1).

     Because of the  overlapping issues  and common  subject,

this  court  consolidated  the  two appeals  taken  from  the

district court judgment with the proceeding for direct review

of  the EPA  action.   In this  opinion, we  address first  a

jurisdictional  objection raised  by the  federal defendants,

then statutory issues posed by the appeals from the  district

court,  and  finally  the  additional  issues  posed  by  the

Massachusetts regulations  and by the petition  to review the

EPA's action approving regulation 7.38.

                       II. JURISDICTION

     The   federal  defendants  renew  in  this  court  their

argument,  not passed  upon  below, that  the district  court

"lacked jurisdiction" over the  complaint against the federal

defendants.  The  "citizen suits" provision of  the Clean Air

Act permits private suits in three defined classes of  cases.

As  already  noted,  it  explicitly permits  a  private  suit

against  anyone   who  "proposes  to   construct"  any  major

stationary  source without a permit required by parts C or D.

                             -9-

42 U.S.C.    7604(a)(3).   The federal  defendants deny  that

they  are proposing to construct  the project or  any part of

it; in other  words, they argue that if anyone  is subject to

suitunder subsection(a)(3), itis onlyMassachusetts officials.

     The  statute  also  permits  such  citizen  suits  where

emission standards or limitations  are exceeded, or where the

EPA  Administrator has failed to perform an act or duty under

the Clean  Air Act "which  is not  discretionary . .  ."   42

U.S.C.     7604(a)(1),  (2).   As  to  these categories,  the

federal  defendants argue  that  any violations  of  emission

standards or  limitations would  be those of  the state,  and

that the  EPA Administrator  cannot be  sued for  violating a

non-discretionary duty since enforcement by the Administrator

is inherently a discretionary matter.

     The  Sierra  Club,  responds, unpersuasively,  that  any

jurisdictional objection  has been  waived by the  failure of

the federal defendants to cross appeal.3   More usefully, the

Sierra Club urges that  the Administrator did violate a  non-

discretionary duty by  failing to take  action to enjoin  the

project,  and   that  in   any  event  the   Federal  Highway

Administration  is so  closely  involved in  the funding  and

planning of this project as to  be effectively a party to its

                    

     3The  jurisdictional  objection  could be  viewed  as an
alternative  ground   for   sustaining  the   denial  of   an
injunction,  dispensing with any need for a cross appeal.  In
any  event, courts  are  expected to  "notice" jurisdictional
objections even if no one has raised them.

                             -10-

construction.  However, like the government brief, the Sierra

Club's  brief is  silent  as to  what practical  implications

these questions have in  this case where no one  has disputed

that   Massachusetts  defendants   can   be   enjoined   from

construction if a permit is required.

     Absent some  showing that  the jurisdictional  issue has

practical importance in  this case, we decline to address it.

Since  the Massachusetts  officials are  subject to  suit for

constructing the project without a permit, the merits must be

reached in  any event.   And since we  resolve the merits  in

their  favor,  the jurisdictional  issue  as  to the  federal

defendants is pretty  close to moot, affecting  only the form

of the  dismissal as to them.   There is  ample precedent for

by-passing jurisdictional objections when  the court can more

easily dismiss on the  merits.  E.g., Norton v.  Mathews, 427
                                                        

U.S. 524, 532 (1976). 

                  III. THE STATUTORY ISSUES

     The  merits  of  the  appeals from  the  district  court

judgment  turn principally  on  a narrow  point of  statutory

construction, namely, whether the ventilation  buildings that

will vent the underground  highway and harbor tunnel comprise

a "stationary source or sources" within the meaning the Clean

Air Act.  If so labeled, a permit is required; apparently the

amount  of pollutant needed to qualify as a "major" source is

not  at issue.    Easily stated,  the  issue is  less  easily

                             -11-

resolved: there is little by way  of statutory definition, no

useful  judicial precedent or  legislative history offered to

us, and a reasonable possibility that Congress never gave any

thought  to  the  idiosyncracy  posed  by  these  ventilation

buildings.  

     Starting as one normally does with language, parts C and

D, which contain the pre-construction permit requirements for

major stationary sources, originally contained  no definition

of  stationary  source.   Instead  part  D  defines  a "major

stationary  source" as  "any  stationary facility  or source"

emitting the  specified quantity  of pollutant.   Part C,  by

cross-reference  (see  note  1,   above),  adopts  the   same

language.    Part  A, concerned  with  so-called  performance

standards, other than air quality standards, did use the term

"stationary  source" in 42 U.S.C.   7411, defining it as "any

building, structure, facility, or installation which emits or

may  emit any air pollutant."  42 U.S.C.    7411(a)(3).  That

definition,  however,  was  adopted  "for  purposes  of  this

section," i.e., section 7411.4  
              

                    

     4The obscurity  of the  relationship between the  part A
definition just  quoted and the "major  stationary source" in
parts C and D was the subject of comment by the Supreme Court
in Chevron U.S.A., Inc. v. Natural Resources Defense Council,
                                                             
Inc., 467 U.S. 837,  859-860 (1984).  Yet  another definition
    
of stationary  source appears  in, and is  apparently limited
to, a provision  of part A concerned with  accidental release
of hazardous substances.  See 42 U.S.C.   7412(r)(2)(C).
                             

                             -12-

     Thus far the breadth of the  language appears helpful to

the Sierra Club position, since linguistically  a ventilation

system  with a stack could be called a "facility," a "source"

or even a "building."  The table tilted back the other way in

1977  when Congress  amended  the Clean  Air  Act to  exclude

"indirect   sources"  from   mandatory   coverage  in   state

implementation  plans.    42  U.S.C.     7410(a)(5)(A).    An

indirect source is defined in the statute as

     a facility, building, structure, installation, real
     property, road,  or highway which attracts,  or may
     attract, mobile  sources of pollution.   Such  term
     includes parking  lots, parking garages,  and other
     facilities subject to any measure for management of
     parking supply  . . . .

42 U.S.C.   7410(a)(5)(C).  Asserting that auto makers should

bear  the  brunt  of  reducing  tailpipe  emissions, Congress

imposed the limitations already  described on the EPA efforts

to regulate the magnets for vehicles rather than the vehicles

themselves.  See  H.R. Rep.  No. 294, 95th  Cong., 1st  Sess.
                

219-227 (1977).

     Although indirect sources are not in terms excluded from

the definition of stationary sources--the former provision is

cast instead as  a limitation on EPA authority--the effect of

the amendment  is  to treat  indirect sources  as a  separate

category of sources subject to a different legal regime.  The

states  may  still  "choose[]"  to  regulate  them  in  state

implementation  plans, 42  U.S.C.     7410(a)(5)(i), but  the

decision whether and how  to regulate is left largely  to the

                             -13-

states.   Our best reading  of the statute is  that, at least

after 1977,  an indirect  source is  not to be  treated as  a

stationary  source under Parts C  and D.   Cf. South Terminal
                                                             

Corp. v. EPA,  504 F.2d  646, 669 (1st  Cir. 1974)  ("parking
            

structures, which themselves emit  no pollutants but  instead

only  attract   vehicles  which   emit  pollution,   are  not

stationary sources").

     Assuming that a stationary source and an indirect source

are  exclusive  categories,  the difficult  question  remains

whether ventilation  buildings should be  assimilated to  the

former or to the latter.   It is a question that dictionaries

cannot answer.   The terms  are technical rather  than common

ones,  and they  were developed against  the background  of a

complex statute  with  interlocking provisions  and  specific

goals.  Nor does  legislative history furnish any clue  as to

Congress' intent  for  ventilation buildings.   Perhaps  this

small corner  among possible applications of  the statute was

simply overlooked.

     Similarly,  it  is difficult  to  derive  any clear  cut

answer  from analogy or policy.5  A covered highway or tunnel

                    

     5The Sierra Club urges that the definition of stationary
source is analogous to the  definition of "point source",  33
U.S.C.    1362(14), in the Clean Water Act and that we should
regard  the  related  caselaw  as precedent.    See  National
                                                             
Wildlife v. Gorsuch, 693 F.2d  156, 173-174 (D.C. Cir. 1982).
                   
We find little help from a different term used in a different
statutory scheme.  Nor  do we think that it  matters whether,
as the  Sierra Club  asserts, pollution tests  or projections
done by  engineers for  the ventilation  systems are akin  to

                             -14-

with  a ventilation system is akin to an uncovered highway or

open  sided  garage--clearly,  indirect sources--in  multiple

senses: in each instance the  facility or space attracts more

cars, pollution in the vicinity may be greatly increased, and

the initial source  of the pollution is  the cars themselves.

On the other hand, the possibility exists (no information has

been  provided to  us  on the  point)  that the  large  scale

ventilation systems  may  be more  potent than  a highway  or

garage  in  concentrating  and  expelling  pollutants   in  a

specific area; and  on this  ground, if no  other, one  might

distinguish between  them and  a facility that  is ordinarily

ventilated without  mechanical aid.  Thus  the analogy hardly

dispels all doubt.

     Two other  arguments pressed by  the parties seem  to us

inconclusive.   The Sierra Club points us to a new provision,

added  to  Title  I in  1990  without  limitation  as to  its

application,  which for  the  first time  defines  stationary

source as meaning "generally  any source of an air  pollutant

except those  emissions resulting  directly from an  internal

combustion  engine  for  transportation purposes  or  from  a

nonroad engine or nonroad vehicle  as defined in section 7550

.  . . ."  42 U.S.C.   7602(z).  The Sierra Club stresses the

word   "directly,"  arguing  that   the  emissions  from  the

                    

those  done for  stationary sources;  presumably, they  would
also be similar if the system vented a large garage, which is
unquestionably an indirect source.

                             -15-

ventilation shaft do not fit the  "except" clause because the

auto emissions  are emitted first ("directly,"  in the Sierra

Club's  view) into the air  of the covered  highway or tunnel

andonly thengatheredbyfansand spewedoutthroughtheventilators.

     The government brief offers its  own parsing of this new

language, but  both sides'  arguments about what  is "direct"

and  what  is an  "indirect" emission  have  the flavor  of a

Medieval dispute in theology.   The reality is that  Congress

framed  this new  subsection  (z) to  deal  with an  entirely

different problem,  namely, to include  within the stationary

source definition mobile sources  of pollution, like ships in

port and  portable asphalt  concrete plants,  so far  as they

emit pollutants as part of their stationary activities, e.g.,
                                                             

by leaking fuel at dockside  (in contrast to engine emissions

that   occur  when  the  ship  or  plant  travels  to  a  new

destination).   S. Rep. No.  228, 101st Cong.,  1st Sess. 376

(1990).  In other words,  Congress was not addressing  tunnel

ventilation when it drew up this new provision.

     Conversely,  we  are  doubtful  about  the  government's

argument   based  upon   the   structure   of  the   statute.

Admittedly,  Congress did  establish  two different  regimes:

that  in Title  I,  with  which  we are  concerned,  governed

stationary  sources;  that  in   Title  II  created  a  quite

different regime, part of which is familiar to anyone who has

a  car  inspected, to  regulate  vehicle emissions  directly.

                             -16-

This  symmetry could  suggest  that  tailpipe  pollution--the

source of the pollutants at issue here--was not meant to fall

within Title I at all.  The difficulty is that Congress might

not have minded two layers of control, and contrivances  like

the "indirect  source" provision in  Title I blur  the notion

that auto pollution is exclusively a Title II problem.

     In the end,  we think the balance is  tipped here by the

explicit administrative interpretation  of the Clean Air  Act

adopted  by the EPA.  In approving the addition of regulation

7.38  to Massachusetts'  state  implementation plan,  the EPA

stated:

     Tunnel ventilation  systems, which do  not generate
     their  own  emissions  but  rather   simply  funnel
     emissions from mobile  sources, are not  stationary
     sources  within the meaning of the Clean Air Act.  

57 Fed. Reg. 46310, 46311 (1992).  The Supreme Court has told

us that in  construing a statute the courts should ordinarily

show  a  measure  of  deference to  the  agency  charged with

administering the  statute.6  The  case most often  cited for

that  precept   is  Chevron,   which  involved  a   different
                           

application of  the very  same "stationary  source" provision

that is now before us.

                    

     6See Environmental Protection Agency v. National Crushed
                                                             
Stone Ass'n, 449 U.S. 64, 83 (1980); Chevron, U.S.A., Inc. v.
                                                          
Natural Resources Defense Council, Inc., 467 U.S. 837 (1984);
                                       
United  States v. City of  Fulton, 475 U.S.  657, 666 (1986);
                                 
National Labor Relations Board v. Food and Commercial Workers
                                                             
Union, 484 U.S. 112, 123 (1987).
     

                             -17-

     The Chevron doctrine has been the subject of much debate
                

and,  in subsequent  decisions,  the Supreme  Court may  have

softened its  impact somewhat and  in some situations.   See,
                                                             

e.g., INS v. Cardoza-Fonseca,  480 U.S. 421, 448 (1987).   To
                            

be  sure,  the  courts  have   the  last  word  on  statutory

interpretation--the  question  is one  of  the  weight to  be
                                                      

accorded to agency views--and often the statute's language or

history  leaves no latitude for  the agency.   In other cases

the  issue  of  interpretation  may  be  so  central  to  the

operation  of  the statute  that,  whether  or not  Congress'

meaning  is clear, it  is improbable that  Congress meant for

the courts to  defer to the agency.  We do not think these or

other qualifications on Chevron deflect its impact here.
                               

     On the contrary, this statute  is ambiguous on the issue
                                      

before us,  at least when  the words "stationary  source" are

read  together with  the  "indirect source"  proviso and  the

structural  juxtaposition  of  Titles  I   and  II.       The

application of the stationary and indirect source language to

tunnel  ventilation is  not the  heart of  the statute  but a

fringe  issue on which  Congress did not  clearly express its

intent.   The  Clean  Air Act  is  an immensely  complex  and

technical statute  more familiar to EPA than  to anyone else,

and  the   task  of   making  its  parts   function  together

harmoniously is entrusted to many actors but above all to the

EPA.  

                             -18-

     In sum this is a case in which Chevron  and deference to
                                           

the agency  are  not make-weights  or  subsidiary  arguments.

Rather,  in  this  fairly  debatable  case,  where  statutory

language  is  ambiguous, legislative  history  is silent  and

policies  and analogies can be and have been mustered on both

sides,  we  think  that  the EPA's  unqualified  and  precise

reading  is  decisive.     It  is  unnecessary  to  calibrate

perfectly  the weight to be accorded to  the agency view in a

case of this species:  once "considerable" weight is accorded

to EPA's reading  of the  statute, see Chevron,  467 U.S.  at
                                              

844, it is enough to tip a set of scales otherwise so closely

balanced.

      IV. THE MASSACHUSETTS REGULATIONS AND EPA APPROVAL

     Our concern  with the district  court case is  not quite

over.   Even if Congress  did not  designate the  ventilation

facilities  in   this   case  as   stationary  sources,   the

possibility  remains that  Massachusetts  has adopted  in its

state implementation plan--and then  sought to ignore for its

own construction project--pertinent  legal restrictions  that

can be implemented through a  suit under the Clean Air Act.  

Of  course, not every state-law restriction on a project is a

matter of federal  concern, but a  state restriction that  is

part of a federally  approved state implementation plan under

the  Clean  Air Act  may at  least  in some  circumstances be

                             -19-

within the purview of a citizens suit under 42 U.S.C.   7604.

     At  one point  in its  brief, the  Sierra Club  seems to

argue  that whatever  Congress may  have meant  by stationary

source,  Massachusetts  in  its  general  permit  requirement

regulation  7.02,  310  C.M.R.     7.02,  has  required  pre-

construction approval of a  class of facilities that includes

the ventilation  buildings  in this  case.   One  version  of

regulation  7.02   has  been  approved  by  EPA  as  part  of

Massachusetts'   state   implementation   plan.      Although

Massachusetts has  adopted a later version  not yet approved,
                                               

we will  assume arguendo that the  original, approved version
                        

of the regulation still exists as a matter of federal law and

that a violation of this version  might well be remedied by a

citizen suit under the federal statute.7

     The difficulty  with the Sierra Club's  argument, as the

government brief points out, is  that this regulation on  its

face applies  to a short  list of specific  facilities (e.g.,
                                                            

chemical products manufacturing plants)  that do not  include

highways,  tunnels or  associated ventilation  systems.   The

                    

     7The  Sierra  Club  also  argues that  the  more  recent
version of regulation 7.02 applies to the project (or  would,
if not invalidly qualified  by regulation 7.38); but we  need
not  decide whether  the  more general  language  of the  new
version could embrace highway and tunnel ventilation systems.
The  new  version  does  not  reflect  a  federally  approved
requirement, nor do we think that it casts any light upon, or
represents an exercise of authority under, the older version.

                             -20-

regulation  also applies  to  "such other  facilities as  the

[state]   Department   [of   Environmental  Protection]   may

require,"  but  that  state  agency  has  not  required  pre-

construction review of  the ventilation buildings  under this

version of the regulation.  The most that the Sierra Club can

extract  from the  affidavit  submitted by  the  head of  the

agency is that his  agency wobbled over  the issue of how  to

regulate the ventilators at issue  in this case, and  finally

decided to propose the  "indirect source" regime now embodied

in regulation 7.38.  

     Regulation 7.38  which  now governs  tunnel  ventilation

systems says  that they are  not subject to  regulation 7.02.

We think that this exclusion seeks to remove ambiguity and is

very weak  evidence that the  new version of  regulation 7.02

would otherwise cover such systems, and no evidence at all of

the meaning of  the old version.   Nor do  we agree with  the

Sierra  Club that its reading of old regulation 7.02 is borne

out by Town of Brookline v. Commissioner of the Department of
                                                             

Environmental Quality  Engineering, 387 Mass. 372, 439 N.E.2d
                                  

372 (1982).  That case involved the application of regulation

7.02  to   a  diesel  fuel-powered  facility   (in  fact,  an

electrical generating station), which is listed as a facility

automatically covered by old regulation 7.02.

     To  construe   the  old  version   of  regulation   7.02

definitively is  a daunting  task, for  it was complex,  ill-

                             -21-

structured, and apparently confusing even to the state agency

that administered it.  But the Sierra Club's argument depends

upon a showing by it that  the old regulation 7.02 did govern

highway and tunnel ventilation systems.  Such systems do  not

fall within the list of  specifically named facilities in the

regulation.   Similarly, the Sierra  Club has not  shown that

the state agency ever extended that version of the regulation

to such systems under the "may require" clause.

     This  brings us to the attack on regulation 7.38 that is

the subject of  Sierra Club's  direct review  petition.   One

might  at first wonder why  the Sierra Club  is interested in

overthrowing a  regulation which, if less  stringent than the

pre-construction  permit  requirement  for  major  stationary

sources,  is  at least  a sizable  step  in the  direction of

regulating ventilation  systems, a  step that the  state need

not  take at all if--as  the EPA has  ruled--such systems are

not  stationary  sources  but  merely  adjuncts  to  indirect

sources.    Indeed,  the   EPA's  notice  approving  the  new

regulation  notes  that   the  Conservation  Law   Foundation

endorsed it.  57 Fed. Reg. 46310, 46311 (1992).

     The answer  is that  the Sierra Club,  with considerable

imagination, has constructed the following argument: the 1990

amendments to  the Clean Air  Act contained a  savings clause

that  sought to  forbid  states from  softening pre-amendment

"control requirement[s]"  in areas that had  not attained the

                             -22-

national air quality  standard for a  pollutant, 42 U.S.C.   

7515;  the Boston area has admittedly not met these standards

for certain pollutants; and  therefore (says the Sierra Club)

regulation 7.38 is in violation of the savings clause because

it substitutes  as to  tunnel ventilation systems  the softer

regime of  the new regulation  7.38 for  the more  stringent,

previously applicable regime of regulation 7.02.

     We will assume without  deciding that the savings clause

would prevent  the weakening of a  state implementation plan.

But even so  we do not  read the savings  clause to refer  to

anything  other than  an effective, federally  approved state

implementation plan.8  It is  the older version of regulation

7.02  which alone was federally  approved at the  time of the

1990 Clean  Air Act Amendments.   And, as  already explained,

the Sierra  Club has failed  to establish that  the pertinent

older version of regulation 7.02 did apply to covered highway

or tunnel ventilation systems.  Accordingly, regulation  7.38

                    

     8As Senator Chafee explained in the floor debate on this
provision:

          "The  savings  provision was  intended to
          ensure  that there  is no  backsliding on
          the   implementation   of   adopted   and
          currently feasible measures that  EPA has
          approved    as    part    of   a    State
          implementation plan in  the past, or that
          EPA has  added to State plans  on its own
          initiative or pursuant  to a court  order
          or settlement."

136 Cong. Rec. S17,237 (daily ed., October 26, 1990).

                             -23-

does  not  weaken a  federally approved  state implementation

plan but rather strengthens  it by extending a new  regime to

such  ventilation  systems   where  previously  no  federally

approved regime applied at all.  

     We are  left with two  further arguments in  relation to

regulation  7.38.  First, it is  claimed that regulation 7.38

is  invalid because, according to  the Sierra Club, the state

was  required  by  M.G.L. ch.  111,     142A,  to obtain  the

approval of  the Governor of Massachusetts  and the Executive

Council  but did  not  do so.    This argument  was  made, it

appears,  on the premise  that regulation 7.38  was needed by

the government defendants in order  to remove a bar otherwise

presented by regulation 7.02.   As we have seen,  the premise

is mistaken, and invalidating  regulation 7.38 would probably

free the ventilation  systems from any federally  enforceable

regulation.

     Nevertheless,   the    issue   of   governor-and-council

approval,  although irrelevant  to the injunction  action, is

raised by the Sierra Club's petition to review EPA's approval

of the new regulation.  Since the direct review statute has a

time limit  on petitions, 42  U.S.C.   7607(b)(1),  we cannot

properly defer decision on the validity of regulation 7.38 to

some future point.  Indeed,  EPA in approving the regulation,

noted  that Massachusetts'  Secretary  of State  had attested

that  the regulation  was  properly adopted,  and EPA  itself

                             -24-

ruled  that the  Massachusetts  Department  of  Environmental

Protection  had authority "to  adopt such regulations without

approval  by  the Governor  and Council."    57 Fed.  Reg. at

46312.

     It is difficult for anyone  but a Massachusetts court to

pronounce  with  certainty  on  this  issue.    But when  the

regulation  is attested  by  the state  secretary as  validly

adopted and its procedural validity  is supported in a  brief

signed  by the  state's  attorney general,  it  would take  a

rather  strong  showing  to  persuade  us to  hold  that  the

regulation is  invalid on  procedural grounds.   Assuming (as

seems likely) that its procedural  validity is open to review

in this  court and that the state  secretary's attestation is

necessary but  not conclusive,9  we think that  EPA correctly

concluded that the  regulation was  properly adopted  without

the approval of governor and council.

     The state in submitting regulation 7.38 to  the EPA said

that it was  adopted pursuant to M.G.L. ch.  111,    142B and

142D, not section  142A.  Section  142B establishes a  Boston

area pollution  control district and gives  the Department of

Environmental  Protection   authority  to  issue   rules  and

regulations to prevent pollution in the district.  Regulation

                    

     9The  Clean   Air  Act  requires  a   state  to  provide
"necessary assurances" that it  has authority under state law
to  carry  out   the  implementation  plan.    42   U.S.C.   
7410(a)(2)(E)(i).

                             -25-

7.38, which  is directed exclusively to  the Boston district,

appears  to fit comfortably within the ambit of section 142B.

The  rulemaking provision  of  section 142B,  unlike  section

142A, contains no  requirement for approval  of rules by  the

state's governor or council.

     The  Sierra   Club's  contrary  argument  is   based  on

confusing  language  in M.G.L.  ch.  111,    142A,  a broader

provision governing air pollution in general.  In its opening

sentence,  this   section   says  that   the  Department   of

Environmental Protection,  "in this section  and in  sections

one hundred and forty-two  B to one hundred and  forty-two E,

inclusive, hereinafter  called the department" may subject to

the approval of the governor and council adopt regulations to

control pollution.   Id.   The  Sierra Club  apparently reads
                        

this sentence as  extending the governor-and-council approval

requirement of section 142A to rules made under section 142B.

     We think the more natural reading of the quoted language

in  section 142A  is to  specify that the  term "department,"

when  used without  further  explanation in  the cited  later

sections,  means the Department  of Environmental Protection.

Section  142B,   for  example,   does  refer  only   to  "the

department."    Nor   is  there  anything  remarkable   about

requiring    governor-and-council   approval    for   general

regulations while not doing so for those directed to a single

district;  indeed, the  Sierra  Club reading  would make  the

                             -26-

grant  of  rulemaking   power  in  section  142B   redundant.

Accordingly, we  reject this challenge to  the EPA's approval

and dismiss the petition to review.

     The  government  brief   construes  the  Sierra   Club's

argument to embrace, in addition  to the claim just rejected,

a  further  claim  that  regulation 7.38  cannot  be  applied

"retroactively" to the  central artery and tunnel at issue in

this case.  The  regulation by its terms is intended to apply

to the project.   See 310 C.M.R.   7.38(1).   In response the
                     

government  argues at  length  that under  Massachusetts  law

whatever retroactivity  may be  involved in applying  the new

regime  to a  previously  planned but  unbuilt  portion of  a

project is permissible.

     It  is not entirely clear that the Sierra Club is making

the argument  attributed to it  by the  government.   However

this may be, the EPA did not suggest that its approval of the

regulation  depended on how or whether it would be applied to

existing  projects; the  EPA's  notice of  approval does  not

discuss  retroactivity at all.  There is no reason to suppose

that  EPA's approval is at all dependent on the retroactivity

issue.   We have no  need, in fact  no warrant, to  decide an

issue  that  is not  material  either to  the  district court

judgment nor  to the validity  of the EPA action  that is the

subject of the petition to review.  

                             -27-

     The judgment of  the district  court is  affirmed.   The
                                                      

petition for review is denied.
                             

                             -28-