The new dangers found in the FAU study add to the risks already associated with sargassum, chiefly the risk to people with respiratory problems stemming from the release of hydrogen sulfide, which gives the sargassum it’s unpleasant odor.

Source: https://www.bostonherald.com/2023/05/30/florida-bound-giant-seaweed-blob-contains-flesh-eating-bacteria-study-shows/

Then low residual concentrations of hydrogen sulfide can cause irritation to the eyes, nose, and throat.

Source: https://caymannewsservice.com/2023/03/no-easy-fixes-for-giant-sargassum-blob/

Workers exposed to methane, ethane, carbon dioxide, hydrogen sulfide or other hydrocarbon components from drilling and refining can experience respiratory problems, headaches, dizziness and insomnia.

Source: https://www.forbes.com/sites/forbestechcouncil/2023/11/28/technology-making-todays-liquefied-natural-gas-lng-industry-safer/