Document ID: ./input/supremecourt_opinions/opinions/23pdf/23a349_0813.pdf
Page Number: 4

Cite as:  603 U. S. ____ (2024) 

1 

Opinion of the Court 

NOTICE: This opinion is subject to formal revision before publication in the 
United  States  Reports.  Readers  are  requested  to  notify  the  Reporter  of 
Decisions,  Supreme  Court  of  the  United  States,  Washington,  D. C.  20543, 
pio@supremecourt.gov, of any typographical or other formal errors. 

SUPREME COURT OF THE UNITED STATES 

_________________ 

Nos. 23A349, 23A350, 23A351 and 23A384 
_________________ 

23A349 

OHIO, ET AL. 
v. 
ENVIRONMENTAL PROTECTION AGENCY, ET AL. 

23A350 

KINDER MORGAN, INC., ET AL. 
v. 
ENVIRONMENTAL PROTECTION AGENCY, ET AL. 

23A351 

AMERICAN FOREST & PAPER ASSOCIATION, ET AL. 
v. 
ENVIRONMENTAL PROTECTION AGENCY, ET AL. 

23A384 

UNITED STATES STEEL CORPORATION 
v. 
ENVIRONMENTAL PROTECTION AGENCY, ET AL. 

ON APPLICATIONS FOR STAY 

[June 27, 2024] 

  JUSTICE GORSUCH delivered the opinion of the Court. 
  The Clean Air Act envisions States and the federal gov-
ernment  working  together  to  improve  air  quality.    Under 
that  law’s  terms,  States  bear  “primary  responsibility”  for 
developing  plans  to  achieve  air-quality  goals.    42  U. S. C. 
§7401(a)(3).  Should a State fail to prepare a legally compli-
ant plan, however, the federal government may sometimes 
step  in  and  assume  that  authority  for  itself.    §7410(c)(1).