AsO3, or arsenic trioxide, is a chemical compound composed of arsenic and oxygen. It appears as a white or yellowish powder and is primarily used in the production of glass and ceramics. Additionally, it has applications in the pharmaceutical industry, particularly in the treatment of certain types of leukemia, such as acute promyelocytic leukemia (APL). Arsenic trioxide is highly toxic and poses significant health risks if ingested or inhaled. It is classified as a carcinogen, meaning it can potentially cause cancer. Proper safety measures and regulations are essential when handling this compound to prevent exposure and environmental contamination.