An Ottawa resident narrowly avoided serious harm after a faulty boiler released hazardous levels of carbon monoxide gas early Friday morning. The incident occurred on Amiens Street when the resident began feeling unwell. An alarm soon confirmed the presence of dangerous carbon monoxide in the home. The resident promptly called 911 and was advised to exit the building for fresh air while waiting for emergency responders. Ottawa Fire Services public information officer Nick DeFazio reported that firefighters detected high levels of carbon monoxide right at the front door. Wearing protective gear, the firefighters conducted a search and discovered even more alarming levels of carbon monoxide in the basement, near the boiler and hot water tank. Technicians from Enbridge confirmed that the boiler was the source of the leak. One resident reported feeling queasy and lightheaded, prompting firefighters to administer oxygen on-site. Ottawa Paramedic Service public information officer Marc-Antoine Deschamps stated that two individuals were evaluated by paramedics but did not require hospitalization. High-powered fans were deployed to ventilate the home and disperse the gas. Exposure to carbon monoxide levels exceeding 70 parts per million (ppm) can lead to symptoms such as headaches, dizziness, and nausea. Prolonged exposure to levels above 150 ppm can be life-threatening. DeFazio noted that readings in the basement reached as high as 375 ppm. Ottawa Fire Services advises homeowners to have fuel-burning appliances and vents inspected annually. In Ontario, residential buildings must be equipped with a functioning carbon monoxide alarm if they have an attached garage, a wood-burning fireplace, or any fuel-fired appliances, including gas stoves, gas water heaters, or gas fireplaces. Provincial regulations also mandate inspection protocols for residential fuel-burning equipment.