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Two-Decade-Old Harvard Data Confounds U.S. EPA Nomination

Buried in the questions Senate Republicans want answered by the nominee to head the Environmental Protection Agency is a stumper: data linking microscopic particles in the air to premature death.

The problem is the EPA doesn’t have the data, which was compiled by Harvard University researchers more than two decades ago, and confidentiality agreements with hundreds of thousands of participants prevent researchers from making it public. The nominee, Gina McCarthy, had nothing to do with the research.