The 15th Report on Carcinogens of the US Department of Health and Human Services adds antimony trioxide, as one of eight further substances to the 248 already known or anticipated to cause cancer. The published report on ATO indicates that in addition to occupational exposure, the “Members of the general population potentially are exposed to antimony trioxide from consumer products containing the compound as a flame-retardant synergist, and more specifically from the dust generated through wear and tear of these products.”.
“Eight Substances Added to 15th Report on Carcinogens”, NIH press release, 23rd December 2021 https://www.niehs.nih.gov/news/newsroom/releases/2021/december21/index.cfm and report on ATO (antimony trioxide) https://ntp.niehs.nih.gov/ntp/roc/content/profiles/antimony.pdf