Plaintiff-Appellants, members of a purported class alleging claims against Defendant-Appellee Exxon Mobil Corporation arising out of a fire in an Exxon Mobil facility, appeal the district court’s order denying certification of a Rule 23(b)(3) plaintiff class in this mass tort action. A panel of this court granted Appellants’ petition fоr permission to appeal and we have jurisdiction to hear this interlocutory appeal under 28 U.S.C. § 1292(e) and Rule 23(f). Finding no abuse of discretion by the district court, we affirm the denial of class certification.
I.
On August 8, 1994, a recently installed control valve in Exxon Mobil’s Baton Rouge Chemical Plant failed, resulting in sponge oil leaks. The oil ignited, and although the fire was controlled quickly, it burned until its fuel source was exhausted, sometime on the morning of August 11, 1994. During the time the fire was burning, the wind carried the smoke plume to the southwest and across the Mississippi River. Exxon Mobil conducted air monitoring both inside and outside the facility, and in the surrounding community during the time of the fire.
Hundreds of suits were soon filed against Exxon Mobil, аlleging various causes of action including personal injury, personal discomfort and annoyance, emotional distress resulting from knowledge of exposure to hazardous substances, fear of future unauthorized exposures, and economic harm including damage to business and property, among others.
After the suits were consоlidated, Appellants proposed class certification under Rule 23(b)(3) for all issues and with the following class definition:
All persons or entities residing or located, or owning property or operating businesses in East Baton Rouge Parish or West Baton Rouge Parish at the time of the incident at the Exxon Chemical Plan, Exxon Refinery, in Baton Rouge, Louisiana, on August 8, 1994, and who sustained legally cognizable damages, including but not limited to all claims for exemplary or punitive damages as provided for in LSA-C.C. art. 2314.3, property damage, business loss, and all personal injury claims, and who have not settled their elaims in full, and who have complied with and comply with all further orders of the court in this class action.1
Appellants also proposed two class representatives.
Following a hearing but before the court ruled on class certification, the court granted summary judgment to Exxon Mobil on certain categories of claims. First, the court granted summary judgment to Exxon Mobil on all claims for physical injuries and non-intentional emotional distress brought by individual plaintiffs who
Following the entry of its summary judgment, the court denied Appellants’ motion for class certification, concluding that Appellants failеd to satisfy the typicality and adequacy requirements of Rule 23(a), as well as the predominance and superiority requirements of Rule 23(b)(3). The Appellants were granted permission to appeal the denial of class certification pursuant to Rule 23(f), and this appeal followed.
II.
A.
We review the denial of class certifiсation for abuse of discretion. See O’Sullivan v. Countrywide Home Loans, Inc.,
Rule 23(a) provides four prerequisites to a class action: (1) a class “so numerous that joinder of all members is impracticable”; (2) “questions of law or fact common to the class”; (3) named parties’ claims or defenses “typical ... of the class”; and (4) representatives that “will fairly and adequately protect the interests of the class.” Fed.R.Civ.P. 23(a); Amchem Products, Inc. v. Windsor,
The district court in this cаse assumed for purposes of its order that the plaintiffs could satisfy the numerosity and commonality questions, but concluded that plaintiffs failed to satisfy the typicality, adequacy, predominance, or superiority requirements. We agree that plaintiffs failed to demonstrate either predominance or superiority, and becаuse failure on those two requirements dooms class certification under Rule 23(b)(3), we decline to address the remaining requirements.
B.
The predominance inquiry requires that questions of law or fact common to the members of the class “predominate over any questions affecting only individual members.” Unger v. Amedisys Inc.
Appellants argue that the district court erred in concluding that the proposed clаss definition failed to satisfy the predominance requirement. Appellants argue that because the alleged injuries all arise from the single incident at the Exxon Mobil plant, the issues relating to Exxon Mobil’s liability predominate over individual issues of causation and damages. Ap-pellee argues that the district court correctly concluded that the individualized medical causation, injury, and damages issues were the predominant issues in the case, and therefore that a class action was an inappropriate vehicle for resolution.
The district court heard from experts who opined that the primary issues left to be resolved would turn on location, exposure, dose, susceptibility to illness, nature of symptoms, type and cost of medical treatment, and subsequent impact of illnesses on individuals. Moreover, in addition to the personal injury claims, separate types of proof would be necessary for the property damage, devaluation, and business loss claims. The district court observed that each plaintiffs claims will be highly individualized with respect to proximate causation, including individual issues of exposure, susceptibility to illness, and types of physical injuries. As a result, the district court found that “individual issues surrounding exposure, dose, health effects, and damages will dominate at the trial.” The district court concluded that “one set of operative facts would not establish liability and that the end result would be a series of individual mini-trials which the predominance requirement is intended to prevent.”
As Appellants argue, the necessity of calculating damages on an individual basis will not necessarily preclude class certification. See Bell,
It is clear from the record .that the damages claims in this case are not subject to any sort of formulaic calсulation. Instead, each individual plaintiff suffered different alleged periods and magnitudes of exposure and suffered different alleged symptoms as a result. Some plaintiffs allege both personal and property injuries, while others allege only one or the other. Moreover, many plaintiffs allege as part of their claim for compensatory damages emotional .and other intangible injuries. “The very nature of these damages, compensating plaintiffs for emotional and other intangible injuries, necessarily implicates the subjective differences of each plaintiffs circumstances; they are an individual, not class-wide, remedy. The amount of compensatory damages to which any individual class member might be entitled cannot be calculated by objective standards.” Allison,
Importantly, the court in Sala determined that the claims in that case involved injuries sustained from a single cause: the collision and derailment of the train on which they were riding. Thus, causation could be adjudicated on a class-wide basis. In this case, although the alleged cause of the injuries is also a single accident — a refinery fire — the causal mechanism for plaintiffs injuries — alleged exposure or fear of exposure to toxic substances — is not so straightforward. While it is certainly true that the cause of the fire itself is an issue common to the class, each individual plaintiff must meet his or her own burden of medical causation, which in turn will depend on any number of the factors enumerated by the experts who testified at the class certification hearing.
Appellants argue, and Appellee appears to agree, that the issue of liability, i.e., Appellee’s negligence or strict liability for improperly installing the valve and causing the fire, can be determined on a class-wide basis. Appellants’ argument, however, does no more than prove that some common issues exist across the class. The predominance inquiry, however, is more rigorous than the commonality requirement. Unger,
Notably, moreover, the class certified in Sterling was bifurcatеd, with class treatment limited to certain class-wide liability issues. See Sterling,
Although Appellants’ counsel during oral argument to this court briefly suggested subclasses or bifurcation as a remedy for the obstacles prevеnting a finding of predominance in this case, the record does not reflect that counsel made such a proposal to the district court. Certainly, when the parties moving for class
C.
Appellants also argue that the district court erred in concluding that the proposed class action did not provide a superior vehicle for resolving the suits. The district court concluded that because of the predominance of individual causation and damage issues, it would not be efficient to certify a class. The district court also notеd that the case has already been streamlined using other case management tools, including narrowing the claims and potential plaintiffs through summary judgment, and facilitating the disposition of the remaining plaintiffs’ claims through issuance of a Lone Pine order.
Because all Rule 23 class-action requirements must be satisfied, and we hold the predominance factor is not, we need not address the superiority factor. However, we address this requirement to demonstrate the interrelationship between predominance and superiority. The Advisory Committee’s notes to Rule 23(b)(3) comment on the impact of the predominance inquiry on superiority in mass tort eases:
A “mass accident” rеsulting in injuries to numerous persons is ordinarily not appropriate for a class action because of the likelihood that significant questions, not only of damages but of liability and defenses to liability, would be present, affecting the individuals in different ways. In these circumstances an action conducted nominally as a class action would degenerate in practice into multiple lawsuits separately tried.
Fed.R.Civ.P. 23(b)(3) advisory committee’s note (citation omitted); see also Castano,
As this court has noted, the predоminance of individual issues relating to the plaintiffs’ claims for compensatory and pu
III.
Because we agree that Appellants failed to demonstrate that their proposed class satisfied either the predominance or superiority requirements of Rule 23(b)(3), we affirm the district court’s denial of class certification.
AFFIRMED.
Notes
. Plaintiffs-Appellants modified their proposed class definition at least twice during the lower court proceedings — once in amending their motion for class certification and again in a post-hearing brief.
. Lone Pine orders, which derive their name from Lore v. Lone Pine Corp.,
