A three-year project funded through the CO Research Trust has looked at whether older people are more affected by low-level carbon monoxide in the home. The work was led by Beth Cheshire as a PhD at Lancaster University, with monitoring in Coventry homes supported by West Midlands Fire Service.
The finding that matters for a household here is not a new legal duty. Prolonged exposure to low-level CO was linked with a worse effect on cognition as age increased. That is below the level that would normally set off a typical domestic alarm (the study used the 50 parts per million for 60 to 90 minutes trigger as the alarm threshold). In 106 older adult homes, 70 (66%) had some CO present in the first month of monitoring. Levels in those homes did not exceed World Health Organization safe recommendations. The researchers describe the results as preliminary, not a finished clinical rule.
High, short bursts of CO already send thousands of people to A&E each year. This work is about the quieter problem: older kit, more hours spent indoors, and gas fires, cookers and boilers used more as the weather turns.
What we can do on a visit in Marlow is unchanged and still useful:
- Service the boiler and check combustion and the flue. That is how most avoidable CO from a heating appliance is caught.
- Confirm the CO alarm is the right type, in a sensible place, and still in date. An alarm that only reacts to a high spike will not tell you about every low-level leak the research is worried about, but it remains the last warning you have.
- Do not ignore a yellow or floppy flame, soot around a fire, or a boiler that keeps locking out.
If anyone in the house has headaches, flu-like symptoms that ease when they leave, or an alarm that has sounded, treat it as urgent. Get out and use 0800 111 999 if fumes or gas are suspected.
To book a service or a gas check, call 01628 901902.