HVAC and Indoor Air Quality — Toxic Gases in Vancouver Homes
Published: July 23, 2026 — BC Wide Home Services Ltd, doing business as BC Wide Heating & Air Conditioning — Greater Vancouver, BC
Carbon Monoxide (CO)
Sources: gas furnaces with cracked heat exchangers, boilers with incomplete combustion, gas water heaters with blocked flues, gas fireplaces with poor draft, and attached garages (vehicle exhaust). Health effects: headache, nausea, dizziness, confusion — above 400 PPM can be fatal. Detection: CO detectors required on every floor. Prevention: annual inspection of all gas appliances.
Nitrogen Dioxide (NO2) and Formaldehyde
NO2: produced by gas combustion — gas stoves and furnaces. Short-term exposure: respiratory irritation. Formaldehyde: off-gasses from building materials, furniture, and some insulation. Long-term exposure: respiratory issues. Both are reduced by proper ventilation — use exhaust fans when cooking and consider an HRV/ERV for continuous fresh air.
VOCs and Other Pollutants
Volatile organic compounds (VOCs): from paints, cleaners, air fresheners, and new furniture. HVAC can help by: using MERV 11-13 filters, running the fan continuously for air circulation, and installing a UV air purifier or activated carbon filter. Avoid ozone-generating air purifiers — they create a lung irritant.