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In a recent decision, the Missouri Supreme Court for the first time considered the meaning and application of a pollution exclusion in a commercial general liability policy, landing unanimously on the side of the insurance company in favor of denying coverage to the insured. In Doe Run Resources Corp. v. St. Paul Fire and Marine Ins. Co.et al., the Supreme Court decided whether a policy’s pollution exclusion relieved the insurer from having to defend a lead mining company in numerous toxic tort lawsuits alleging injury from industrial pollution emitted from an overseas operation. The outcome turned on whether the exclusion was ambiguous, and, therefore, should be construed against the insurer in favor of coverage.

Source: Missouri Upholds Pollution Exclusion to Relieve Insurance Company from Duty to Defend Toxic Tort Claims Arising from Industrial Pollution – Lexology