A scientist prepares samples while doing research on PFAS at a U.S. Environmental Protection Agency lab. Understanding of chemicals’ risks has been built on IRIS assessments.
              AP Photo/Joshua A. Bickel

For decades, the U.S. Environmental Protection Agency has relied on an independent scientific program to answer two basic questions when chemicals come up for review: Does the chemical pose a threat to human health? If so, how much exposure is necessary before it becomes a problem?

The scientists involved in that program, known as the Integrated Risk Information System, or IRIS, served as neutral scientific referees.

Originally published on theconversation.com, part of the BLOX Digital Content Exchange.

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