Colorless, Odorless, & Deadly Toxic Gases

• Radon — #1 Hazard in Basement Spaces
  • Source: A naturally occurring radioactive gas produced by the breakdown of uranium in soil and rock. It enters basements through microscopic cracks in floors and walls.
  • Risk: Completely invisible and scentless. Prolonged exposure is the #1 cause of lung cancer among non-smokers, making regular testing essential for any home with a basement.
• Carbon Monoxide (CO)
  • Source: Produced by the incomplete combustion of gas or oil-burning appliances commonly located in basements, such as furnaces, water heaters, and generators.
  • Risk: Known as the “Silent Killer,” it is lighter than air and spreads rapidly upstairs, causing oxygen deprivation and fatal poisoning while the family sleeps.

Explosion & Fire Hazard Gases (Combustible / Flammable Gases)

• Methane & Natural Gas
  • Source: Gas pipeline leaks connected to the basement or sewer gas backflow through floor drains.
  • Risk: Extremely volatile. Once it reaches a certain concentration in an unventilated basement, a tiny spark (like a furnace cycling on) can trigger a catastrophic explosion.
• Propane / LPG
  • Risk: Unlike natural gas, propane is heavier than air. If a leak occurs, it pools and concentrates along the basement floor, making it incredibly difficult to disperse without dedicated detection and ventilation.

Chemical Pollutants & Asphyxiants (Due to Humidity & Poor Ventilation)

• VOCs (Volatile Organic Compounds) & Formaldehyde (HCHO)
  • Source: Continuously off-gassed from stored paints, varnishes, adhesives, pesticides, and synthetic building materials commonly kept in basement storage.
  • Risk: Trapped in unventilated spaces, these chemical gases build up to cause headaches, dizziness, respiratory issues, and long-term carcinogenic risks.
• Carbon Dioxide (CO₂) & Oxygen Deprivation
  • Source: Spikes rapidly in sealed, poorly ventilated basements when people occupy the space or when stagnant air traps heavy gases.
  • Risk: Displaces oxygen, leading to drowsiness, severe headaches, and in extreme cases, a high risk of asphyxiation.