UL Standards and Engagement (ULSE) has released a CO Risk Assessment report, in an effort to evaluate each U.S. state’s code and regulatory efforts, health outcomes, and public awareness about carbon monoxide—the silent killer.

The assessment draws on multiple data sources over the last two decades to ensure a comprehensive assessment across public health outcomes, state-level mandates for indoor CO detector presence, and public awareness measures.

Each state is ranked and given a weighted score that is translated into a tier — from CO Safety Champion (the highest tier) to CO Safety Leader, CO Safety Advocate, or CO Safety Starter (the lowest tier) — highlighting how effectively it has addressed CO safety across the three pillars.

Access the full report on ULSE’s website.