exposed

antonyms: non-exposed, unexposed
https://doi.org/10.1351/goldbook.15695
Subject to a factor that is under study in the environment, for instance, an environmental hazard.
Source:
PAC, 2007, 79, 1153. (Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)) on page 1220 [Terms] [Paper]