Ontario's Record Snowfall Creates Hidden Carbon Monoxide Danger in Homes

TORONTO, ON – January 26, 2026 – As Ontarians dig out from a historic winter storm that has shattered snowfall records, the province's public safety regulator is issuing an urgent warning about a hidden danger buried beneath the drifts: carbon monoxide poisoning.

The Technical Standards and Safety Authority (TSSA) is urging homeowners to immediately check and clear snow and ice from their gas meters and the external exhaust vents for all fuel-burning appliances, including furnaces, water heaters, and fireplaces. The warning comes after a weekend storm dumped unprecedented amounts of snow, with Toronto Pearson Airport recording 46 centimeters, contributing to the snowiest January on record.

“Exhaust vents, in particular, often extend out of the side of a home as low as one foot above ground. They have the potential to get covered and blocked easily without a homeowner’s knowledge, especially when a homeowner is shoveling snow or using a snowblower or when there is a severe snow build-up,” says Owen Kennedy, TSSA’s Director of Fuels Safety. Kennedy also highlighted a secondary risk: “Additionally, a snow-covered gas meter can interfere with its ability to regulate gas pressure, creating other serious safety risks.”

The Silent Threat Buried in Snow

Carbon monoxide (CO) is a colorless, odorless, and tasteless gas produced by the incomplete combustion of fuels like natural gas, propane, or wood. When appliance vents are blocked by snow or ice, this deadly gas cannot escape and can quickly build up to toxic levels inside a home. Dubbed the “Silent Killer,” CO is a leading cause of accidental poisoning deaths in Canada, with national statistics indicating over 50 fatalities annually. In Ontario, approximately 65% of all CO incidents occur in private residences, with the vast majority happening during the fall and winter months when heating systems are in constant use.

Symptoms of CO poisoning are often mistaken for the flu and include headaches, dizziness, nausea, and fatigue. If multiple people in a home experience these symptoms simultaneously, it is a critical warning sign. The TSSA advises that anyone suspecting CO exposure should immediately move to fresh air outdoors and call 911.

Fire departments across the province have noted a direct correlation between severe cold snaps and an increase in CO-related emergency calls. The combination of furnaces working overtime and heavy snow accumulation creates a perfect storm for potential tragedy. This risk is so significant that it prompted new provincial regulations. As of January 1, 2026, the Ontario Fire Code was updated to mandate the installation of working carbon monoxide alarms on every level of any home with a fuel-burning appliance, fireplace, or an attached garage, expanding previous rules that only required them near sleeping areas.

A Record Storm and a City on Alert

The urgency of the TSSA's advisory is underscored by the sheer scale of the recent weather event. The storm, part of a larger North American system, paralyzed much of Southern Ontario. Beyond the record 88.2 centimeters of snow that fell on Toronto in January, municipalities like Burlington and Pickering declared “Significant Weather Events” to manage the cleanup. The storm's impact was felt across the region, with the Ontario Provincial Police reporting around 100 vehicle collisions in a 24-hour period, and both Toronto Pearson and Billy Bishop airports facing extensive flight cancellations.

These extreme conditions not only create the specific hazards of blocked vents but also increase the likelihood of power outages. During such outages, the risk of CO poisoning can rise dramatically as residents turn to alternative heating sources. Safety officials stress that fuel-burning appliances designed for outdoor use—such as barbecues, portable generators, or propane heaters—must never be operated indoors, in a garage, or in any enclosed space. Even with windows open, these devices can produce lethal concentrations of carbon monoxide in minutes.

Beyond the Shovel: A Practical Guide to Home Safety

Clearing vents and meters requires care to avoid causing damage that could lead to further safety issues. The TSSA provides clear guidelines for homeowners to follow:

• Use the Right Tools: Gently clear snow away from gas meters and appliance vents using a soft car brush or broom. Avoid using shovels, ice choppers, or other sharp tools that could damage the equipment.
• Be Mindful of Snow Removal: Never pile or blow snow against a meter or vent pipe. When using a snowblower, be cautious to avoid bumping or hitting the equipment.
• Do Not Use Force: Refrain from kicking or hitting meters or vents to break away ice. The components can be sensitive and easily damaged.
• Look Up: Check for and remove icicles from overhead eaves and gutters. Dripping water can freeze on the meter or vent pipes, creating a thick and dangerous ice blockage.

Beyond these immediate actions, experts emphasize the importance of preventative maintenance. Having all fuel-burning appliances, chimneys, and vents inspected annually by a TSSA-registered contractor is the most effective way to ensure they are operating safely and efficiently before winter begins. A qualified technician can identify potential leaks, blockages, or malfunctions that could otherwise go unnoticed.

Community Vigilance and New Safeguards

While individual homeowners are the first line of defense, public safety officials are also calling for community vigilance, particularly in the storm's aftermath. Residents are encouraged to check on neighbors, especially seniors or individuals with mobility issues who may be unable to clear their properties themselves. A few minutes spent helping a neighbor clear a vent could prevent a serious incident.

In response to the widespread cold and snow, many municipalities, including Toronto and the Region of Durham, have opened warming centers to provide shelter and resources for vulnerable populations, including those experiencing homelessness who are at extreme risk during cold snaps. These community-level responses are a vital part of a comprehensive public safety strategy during severe weather.

The recent strengthening of the Ontario Fire Code, requiring more CO alarms in homes, reflects a systemic recognition of the persistent danger. These alarms serve as an essential electronic nose, providing early warning when the silent killer is present. These simple checks and new alarm regulations form a critical defense against a preventable tragedy.