Ethylene oxide is a colorless gas at room temperature and pressure with a sweet ethereal odor that can be detected at ~500 ppm. The primary human health concern with ethylene oxide under typical workplace exposure conditions is its potential carcinogenicity. Although ethylene oxide exhibits a low carcinogenic potency in animal models, epidemiological studies have not conclusively linked exposures to ethylene oxide with carcinogenic outcomes in humans.
Parod, R. J. (2014). Ethylene Oxide. In Encyclopedia of Toxicology: Third Edition (pp. 535–538). Elsevier. https://doi.org/10.1016/B978-0-12-386454-3.00021-X