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This ongoing series uncovered the extent of hazardous air pollution in Louisville, the health risks, the source of pollution, and the failure of federal and local regulators to better address the problems. The newspaper's own independent analysis of air sampling data, published months before the EPA's own official assessment was released, showed pollutants in some areas at concentrations hundreds of times higher than established health thresholds. The series also includes a detailed look at the impact of toxic wastes from industrial plants.