N-Nitrosodimethylamine (NDMA) is a chemical compound classified as a nitrosamine. It is primarily formed through the reaction of dimethylamine and nitrous acid. NDMA is known for its potential carcinogenic properties, meaning it may increase the risk of cancer in humans. It can be found in certain industrial processes and as a contaminant in some food and water sources. NDMA has been detected in various products, including processed meats, beer, and tobacco smoke. Regulatory agencies, such as the U.S. Environmental Protection Agency (EPA), monitor NDMA levels to ensure public safety. Due to its health risks, efforts are ongoing to reduce its presence in the environment.