When people prepare for a holiday, most of us think about sunscreen, travel insurance, and maybe a vaccination or two. Very few think about the air quality inside their hotel room. Yet carbon monoxide (CO) poisoning has quietly become one of the most under-recognised dangers facing travellers today, and it can happen in five-star resorts just as easily as budget guesthouses.
CO is colourless, odourless, and tasteless, which is exactly what makes it so dangerous. Unlike food poisoning or a stomach bug, there’s no smell or taste to warn you something is wrong until symptoms are already setting in, often while you’re asleep and unable to react.
What Is Carbon Monoxide Poisoning?
Carbon monoxide is a gas produced whenever fuel is burned incompletely, whether that’s from gas boilers, water heaters, stoves, generators, or vehicle engines. In a well-ventilated space, it disperses harmlessly. But in a poorly maintained or badly vented room, it builds up in the air and displaces the oxygen your body needs.
Once inhaled, CO binds to your red blood cells far more readily than oxygen does, starving your brain, heart, and muscles of the oxygen they need to function. Left unchecked, this can lead to permanent organ damage or death, and it can happen surprisingly quickly in an enclosed space.
Why Travellers Are Especially at Risk
At home, most of us have a working smoke and CO alarm fitted, often because it’s a legal requirement. Abroad, that safety net frequently disappears. Regulations around CO detectors vary enormously from country to country, and many popular tourist destinations have no requirement at all for accommodation providers to install them.
This means the risk isn’t limited to cheap hostels or off-the-beaten-track homestays. Poisoning incidents have been documented in luxury resorts, well-reviewed hotels, and self-catering rentals across a wide range of destinations. Paying more for your accommodation does not guarantee your safety from this particular hazard.
Common sources of CO exposure while travelling include:
- Faulty or poorly maintained gas boilers and water heaters
- Gas-powered stoves and cookers with inadequate ventilation
- Pool heaters and other fuel-burning appliances near guest rooms
- Petrol generators used during power cuts
- Vehicle exhaust fumes in attached garages or enclosed car parks
- Portable gas heaters or stoves used inside tents while camping
Recognising the Symptoms
One of the most dangerous aspects of CO poisoning is how easily it’s mistaken for something else entirely. Early symptoms often mimic jet lag, a hangover, or a mild stomach bug, which means travellers can dismiss the warning signs for hours or even days.
Watch out for:
- Headache
- Dizziness or light-headedness
- Nausea and vomiting
- Fatigue and weakness
- Confusion or difficulty concentrating
- Shortness of breath
At higher levels of exposure, symptoms can progress rapidly to loss of muscle control, confusion, unconsciousness, and, without prompt treatment, death. Because CO poisoning frequently occurs while people are asleep, many victims never wake up to notice anything was wrong.
Children, pregnant women, older adults, and anyone with existing heart or lung conditions are particularly vulnerable, as their bodies have less capacity to tolerate reduced oxygen levels.
What to Do If You Suspect CO Exposure
If you or a travel companion experience any of the symptoms above during your trip, don’t wait to see if it passes. Act immediately:
- Get outside into fresh air straight away. Don’t linger to pack or investigate the source.
- Alert accommodation staff so they can check the property and warn other guests.
- Seek urgent medical attention, even if symptoms feel mild. CO poisoning can worsen quickly, and early treatment (usually high-flow oxygen) significantly improves outcomes.
- Do not return to the room or area until it has been checked and declared safe by a qualified professional.
How to Protect Yourself While Travelling
The good news is that CO poisoning is highly preventable with a few simple precautions:
- Pack a portable CO alarm. Battery-powered travel alarms are inexpensive, luggage-friendly, and the single most effective way to detect a leak before symptoms start. Look for a Kitemark or CE-approved device, and place it near where you sleep.
- Inspect your room on arrival. Check for visible gas appliances, boilers, or heaters, and avoid rooms where ventilation looks poor or where you notice a faint “off” smell.
- Be cautious in cold climates, where heating systems run continuously and ventilation is often reduced to keep warmth in.
- Check reviews before booking, looking specifically for any past mentions of gas smells, faulty heating, or previous safety incidents.
- Never use portable gas stoves, charcoal grills, or generators inside tents, campervans, or enclosed spaces.
Planning Ahead: Get Expert Travel Health Advice
Carbon Monoxide Poisoning is just one of many health risks that can catch travellers off guard, alongside issues like altitude sickness, food and water-borne illness, and vaccine-preventable diseases specific to your destination. A pre-travel consultation is one of the simplest ways to make sure you’ve covered every angle before you fly.
At our travel clinic in Manchester, our team can talk you through destination-specific health risks, recommend the right travel vaccinations, and give you practical, personalised advice, including simple precautions like packing a CO alarm, so you can focus on enjoying your trip rather than worrying about it.
