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National Toxicology Program: Level of Concern Categories Study

Researchers at the National Toxicology Program (NTP) want to better communicate conclusions about whether environmental substances can cause adverse health effects in people. This important study aims to update NTP’s Level of Concern (LoC) scale.

Want to join the study? Register here.

Registration for Phase One ends September 7.

If you are interested in joining the Level of Concern Categories study, please click on the registration link. If you would like more information on the study, please follow the links below.