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Ontario will mandate carbon monoxide alarms in most homes starting Jan. 1, 2026, to prevent poisonings.
Carbon Monoxide Awareness Week in Ontario, running November 1–7, highlights the dangers of the colorless, odorless gas known as the "silent killer."
Starting January 1, 2026, Ontario will require carbon monoxide alarms on every level of homes with fuel-fired appliances, fireplaces, attached garages, or external heating sources—even if they lack sleeping areas.
The rule also applies to multi-unit buildings like apartments and care facilities.
Alarms must be hard-wired, battery-powered, or plug-in, and landlords are responsible for installation and maintenance in rental units.
Tampering with alarms is illegal.
Symptoms of poisoning include headache, dizziness, nausea, and fatigue—similar to the flu—and can progress to unconsciousness or death.
If exposure is suspected, residents should evacuate, call 911, and wait for emergency responders before re-entering.
The province emphasizes that working CO alarms are the only reliable way to detect the gas and prevent fatalities.
Ontario obligará a las alarmas de monóxido de carbono en la mayoría de los hogares a partir del 1 de enero de 2026, para prevenir envenenamientos.