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Think CO – Carbon Monoxide Awareness

Carbon monoxide (CO) is a silent, invisible, and deadly gas that can’t be detected without an alarm.

Carbon monoxide (CO) is a silent, invisible, and deadly gas that can’t be detected without an alarm. It disperses evenly in a room, rising slowly with hot air from combustion appliances. CO levels are measured in parts per million (ppm), and even low exposure over time can be harmful.

Why Is CO Dangerous?

  • Undetectable by human senses – no smell, taste, or colour.
  • Poisonous and potentially fatal in high concentrations.
  • Even low levels can cause health issues if unnoticed.
  • Risks increase in autumn/winter when heating systems are in use, and ventilation is limited.

Increasing CO Risks

  • Unsafe heating practices due to fuel poverty: using gas ovens, bringing BBQs indoors, or burning unsuitable materials.
  • Post-COVID delays in gas safety checks and appliance maintenance.

Spotting the Risks

Watch for:

  • Yellow/orange flames on gas appliances instead of blue.
  • Excess condensation, which may indicate poor ventilation.
  • Pilot lights frequently going out or noisy boilers.
  • Sooty/brown marks around fires, cookers, or boilers.

CO Poisoning Symptoms

Early symptoms resemble common illnesses:

  • Headaches, nausea, dizziness, breathlessness.
  • Collapse or loss of consciousness in severe cases.

How to Protect Yourself

  1. Annual Servicing
    • Get appliances checked yearly by a Gas Safe registered engineer (www.gassaferegister.co.uk).
    • Check the correct scheme: HETAS (wood burners), OFTEC (heating oil), Chimney Sweeps Federation (chimneys).
  2. Install CO Alarms
    • Buy alarms with BS EN 50291 certification (£10-£20).
    • Options include digital, vibrating, smart alarms, and telecare-connected systems.
    • Sensors last 10 years – replace as needed.
  3. Best Alarm Placement
    • Ideally, fit alarms in every room with a CO source.
    • If only one, place it near the main CO source or where people spend the most time.
    • In bedrooms, install alarms at bed level.
    • For those with sensory impairments, specialist alarms are available.

Even in electric-only homes, CO can enter from a neighbour’s property

Final Thought

CO poisoning is preventable with awareness and the right precautions. Maintain appliances, stay alert for warning signs, and install reliable alarms. One alarm is always better than none!