Carbon monoxide exposure in campus vehicles has injured and killed students nationwide. Learn how CO builds up in cars, buses, and vans, and how campuses and students can prevent it.

Explore how CO Safe Schools strengthened its national database of school carbon monoxide incidents—and why better data improves public health, safety, and prevention.

When a carbon monoxide (CO) incident happens on a school campus, one of the first questions everyone asks is: “Where did it come from?” Parents want to know. Staff want to know. Journalists want to know. Fire marshals and investigators need  to know. But right now, the language we use to describe CO sources in schools is inconsistent and confusing. News stories call it a “gas leak,” a “ventilation problem,” an “equipment issue,” or simply “fumes,” even when the actual hazard