964 F.3d 1145
D.C. Cir.2020Background
- EPA revised the 2015 ozone NAAQS (from 0.075 to 0.070 ppm) and, after states submitted initial area-designation recommendations, finalized nationwide designations in April 2018 using a five-factor "weight-of-evidence" framework (air-quality data, emissions, meteorology, geography/topography, jurisdictional boundaries) and tools including HYSPLIT back-trajectory modeling.
- Multiple environmental groups, the State of Illinois, and several municipalities challenged EPA’s attainment (or partial-attainment) designations for various counties, asserting EPA failed to engage in reasoned decisionmaking and misapplied or ignored relevant data.
- Threshold jurisdictional disputes: EPA contested Article III standing for some environmental groups (members living in areas EPA labeled merely "contributing") and argued state/municipal petitioners could not sue as parens patriae; the court generally found standing for at least one petitioner with respect to each designation challenged.
- The court reviewed EPA’s actions under the Administrative Procedure Act arbitrary-and-capricious standard, giving deference to EPA’s technical expertise but requiring reasoned explanation in the administrative record (no post-hoc rationalizations).
- The court found multiple county designations unjustified or inadequately explained (Jefferson County MO; Monroe County IL; Ottawa County MI; northern Weld County CO; Door and Sheboygan Counties WI), granted petitions for review as to those designations and remanded them for further explanation; it denied the challenge to Lake County IN and granted EPA’s motion to remand several other designations that EPA did not defend (McHenry IL; Porter IN; El Paso TX; Manitowoc WI; Milwaukee-area WI counties).
- The court declined to vacate defective designations, instead remanding them to EPA with instructions to complete the reconsideration “as expeditiously as practicable,” and explained vacatur was not warranted given the statutory framework and potential disruption.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Associational standing for environmental groups whose members live in areas EPA designated as "attainment" or merely "contributing" | Members suffer concrete health and recreational injuries from increased ozone exposure; designation relaxes controls and is traceable/redressable | EPA: no standing where members live in non-violating but "contributing" areas; contribution is legally insufficient for injury | Court: rejected EPA’s categorical rule; accepted member affidavits (except Monroe lacked such an affidavit) as establishing injury, causation, and redressability |
| State/municipal standing to sue federal agency (parens patriae issue) | Illinois/Chicago: suing based on direct injuries to government-owned parks/vegetation (not parens patriae) | EPA: Mellon bars parens patriae suits against federal government; reply affidavits filed too late | Court: accepted unrebutted expert declarations showing direct injury to state/city lands; Mellon not a bar where state asserts injury in its sovereign/governmental capacity; allowed late submission in discretion |
| Whether EPA acted arbitrarily and capriciously in specific area designations (e.g., Jefferson, Monroe, Ottawa, Weld, Door, Sheboygan, Lake) | EPA ignored or inconsistently treated key data (HYSPLIT trajectories, emissions, source-apportionment and modeling), treated similar areas differently, relied on unexplained last-minute changes (e.g., Messina letter), or failed to perform required five-factor analyses | EPA: deference to technical judgments, past practice, metro-area definitions (CSA vs CBSA), lake-breeze explanations, and claimed changing data or analytic judgments | Court: found EPA’s explanations inadequate for Jefferson, Monroe, Ottawa, Weld, Door, and Sheboygan (arbitrary and capricious); upheld Lake County designation; remanded the defective designations for fuller explanation/analysis |
| Appropriate remedy: remand only vs remand with vacatur and timing | Petitioners: seek vacatur to force EPA to meet statutory deadlines and avoid indefinite delay | EPA: requests voluntary remand without vacatur; did not explain proposed course of action | Court: granted remand without vacatur, but treated EPA’s motion as concession of inadequate explanation and imposed a requirement that EPA complete the remand "as expeditiously as practicable" |
Key Cases Cited
- Miss. Comm’n on Envtl. Quality v. EPA, 790 F.3d 138 (D.C. Cir. 2015) (framework and deference for reviewing EPA area-designation decisions)
- Catawba Cty. v. EPA, 571 F.3d 20 (D.C. Cir. 2009) (discussing contribution standard and arbitrary disparate treatment in designations)
- Motor Vehicle Mfrs. Ass'n v. State Farm Mut. Auto. Ins. Co., 463 U.S. 29 (1983) (agency action must be explained in the record; no post-hoc rationalizations)
- Friends of the Earth, Inc. v. Laidlaw Envtl. Servs., 528 U.S. 167 (2000) (environmental plaintiffs can allege injury via diminished recreational/aesthetic use)
- Lujan v. Defenders of Wildlife, 504 U.S. 555 (1992) (standing requires concrete injury, traceability, and redressability; summary-judgment analogy for affidavits)
- Massachusetts v. EPA, 549 U.S. 497 (2007) (state standing where injury is alleged in governmental capacity, e.g., landowner)
- Sierra Club v. EPA, 292 F.3d 895 (D.C. Cir. 2002) (procedure for establishing standing by affidavit at the first appropriate filing)
- Columbia Falls Aluminum Co. v. EPA, 139 F.3d 914 (D.C. Cir. 1998) (agency must examine key assumptions and explain reliance on modeling)
- U.S. Sugar Corp. v. EPA, 830 F.3d 579 (D.C. Cir. 2016) (agency need only provide a reasoned explanation for changing or discounting prior factual reliance)
- Allied-Signal, Inc. v. NRC, 988 F.2d 146 (D.C. Cir. 1993) (vacatur/remand balancing test considering seriousness of deficiencies and disruptive consequences)
- Util. Solid Waste Activities Grp. v. EPA, 901 F.3d 414 (D.C. Cir. 2018) (standards for granting agency motions to remand and considerations of prejudice)
- Vermont Yankee Nuclear Power Corp. v. Nat. Res. Def. Council, 435 U.S. 519 (1978) (limits on court dictating agency factfinding procedure and timeframes, subject to statutory allocation of responsibilities)