Fifteen states conducted surveillance for acute hazardous substance releases at some time during 2006-2010. An average of 13 of the states participated in HSEES* during 2006-2009, and nine states (two unfunded) participated in NTSIP† during 2010, the first year of the program. ATSDR uses these surveillance systems to track the public health consequences from acute hazardous materials (HazMat) releases. State health departments obtained data from multiple sources, including state environmental agencies, police and fire departments, poison control centers, hospitals, local media, the U.S. Coast Guard's National Response Center, and the U.S. Department of Transportation's Hazardous Material Incident Reporting System. Both HSEES and NTSIP define a hazardous substance as one that might reasonably be expected to cause adverse health effects in humans. For this analysis, to find potential suicide incidents, open text fields were queried in the comments and synopsis sections of HSEES and NTSIP databases for the following terms: “kill,” “die,” “death,” “intentional,” “suicide,” “car,” “vehicle,” “truck,” and “auto.” A case was defined as a suicide or attempted suicide using mixed chemicals in an automobile. Case reports were read to confirm that the suicide took place inside an automobile and chemicals were mixed.