If you’re responsible for a school, childcare center, campus facility, or any public building, you may have been told some version of: “Don’t worry; we have CO detectors installed.” But here’s the problem: Most buildings rely on carbon monoxide devices that weren’t designed for educational or multi-room environments. And many assume all CO detection devices work the same; they don’t.

For decades, carbon monoxide (CO) safety education has relied on a familiar visual: a chart linking parts per million (PPM) to predicted health effects. It’s neat, it’s easy to reference, and it’s dangerously incomplete. Because carbon monoxide exposure doesn’t follow charts. It follows conditions: who you are, where you are, and how long you’re there. That’s why it’s time for a new way to understand CO’s impact: a model that puts people, not numbers, at the center.