Carbon Monoxide: Advice for tenants and the general public
There’s a lot to think about day to day within your home life. What’s for dinner tonight? When am I meeting my friends? And when can I fit in shopping? But if there’s just one question you need to ask yourself it’s: Do I understand carbon monoxide and am I safe?
Many people don’t know what carbon monoxide is, so you’re not alone if you’re unsure. We have worked with Wales and West Utilities to develop this information and pull together resources to help keep you and your loved ones safe.
What is carbon monoxide?
Carbon monoxide (CO) is a colourless, odourless, tasteless, poisonous gas that is released when any carbon based fuel, such as coal, oil, wood, petrol, barbeque charcoal and gas, doesn't burn properly.
Breathing it in can make you unwell, and it can kill. Even low levels of exposure, over a long period, can cause serious health issues.
What are the signs of a carbon monoxide leak?
Carbon monoxide is tasteless, odourless and invisible, so you could easily not know if you have a leak.
However, there are some things you can keep an eye out for that might indicate a problem:
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Gas appliances that are burning with a floppy yellow or orange flame that is normally crisp and blue
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Extra condensation inside windows
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Pilot lights on boilers frequently blowing out
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Soot or yellow stains around appliances


Symptoms of CO poisoning
Carbon monoxide poisoning happens when you breathe in even small amounts of this poisonous gas. Every year around 40 people die and over 4,000 become seriously ill as a result of carbon monoxide poisoning.
The most common symptoms of carbon monoxide poisoning are:
- Headache
- Dizziness
- Nausea (feeling sick) and vomiting
- Tiredness and confusion
- Stomach pain
- Shortness of breath and difficulty breathing
Symptoms of carbon monoxide poisoning can be similar to those of food poisoning and the flu. However, unlike the flu, carbon monoxide poisoning does not cause a high temperature (fever).
How to stay safe from carbon monoxide in your home
Ensure gas appliances are serviced annually by a Gas Safe Registered Engineer and ALL fuel burning appliances should be serviced annually by a qualified professional.
Get an audible CO alarm which is certified to British Standard BSEN 50291-1, which can be purchased from your local DIY store, supermarket or energy supplier
Ensure your alarm is fitted in the correct position
Always follow the manufacturers instructions for fitting an alarm
Carbon monoxide alarms in rented accommodation
Whether you are staying in long or short term rented accommodation, your landlord has a legal obligation to protect you from CO. This includes:
- Installing British minimum standard BSEN 50291-1 CO alarms on each floor with living spaces, and in all rooms with fuel-burning appliances.
- Booking annual services with a qualified engineer for all fuel-burning appliances.
If you believe your landlord is neglecting their responsibility for gas safety, please contact your local Citizens Advice Bureau for free legal advice. Guidance varies across the UK, so it's important to know your rights:
Further advice is also available on the HSE Landlords' responsibility for gas safety webpage.
What to do in an emergency
Act fast if you’re concerned about carbon monoxide.
If you suspect carbon monoxide, leave the property first before calling the National Gas Emergency number on 0800 111 999 (lines are open 24/7).
If you think you’ve been exposed to carbon monoxide, call 999 immediately.
Get involved and spread the word
We’ve created resources below that you can send to your family members, colleagues and groups to raise awareness about carbon monoxide.

Further advice
If you believe your landlord is neglecting their responsibility for gas safety, please contact your local Citizens Advice Bureau for free legal advice and know your rights by visiting the Landlords' responsibility for gas safety site for further advice.

Purchasing your CO alarm
Get an audible CO alarm which is certified to British Standard BS EN 50291 which can be purchased from your local DIY store, supermarket or energy supplier. Make sure it’s in the correct position too!