Nature Communications, Published online: 05 August 2026; doi:10.1038/s41467-026-76406-6 Transition-metal oxides offer a low-cost alternative to precious metals for environmental catalysis, yet CO oxidation under humid and sulfur-laden conditions remains a challenge due to rapid catalyst poisoning. Here, the authors report an atomic dispersion of Ti-decorated MnOx-Fe2O3 catalyst with excellent activity and resistance to poisoning.