The California Air Resources Board (CARB) and the California Office of Environmental Health Hazard Assessment (OEHHA) are committed to providing clear and accessible information about acrolein, where it comes from, its health risks, and the actions California is taking to protect public health. Recently released draft estimates of cancer risk reflect the best available science and indicate a cause for concern. However, this risk is based on limited air monitoring data with known limitations and notable uncertainties. Fully understanding the extent of this risk and sources will require additional study and remain an active area of research.