As the number of confirmed or suspected cases of carbon monoxide (CO) incidents in London more than doubles, London Fire Brigade is warning people to ensure they aren’t leaving themselves at risk of carbon monoxide poisoning.
There were 1,714 emergency callouts for firefighters between August 2024 and July 2025, Brigade data shows. This is up from 821 recorded between August 2019 and July 2020. In total, the Brigade has recorded 7,764 carbon monoxide-related incidents between August 2019 and July 2025, where carbon monoxide was suspected or confirmed.
Just last week (5 September), firefighters recorded raised levels of carbon monoxide at a food court in Kensington High Street. The premises was evacuated and then ventilated by crews before being declared safe.
During Gas Safety Week, London Fire Brigade is urging Londoners to make sure they are aware of the importance of carrying out annual gas safety checks.
Carbon monoxide fumes are highly poisonous fumes that are produced by the incomplete burning of fossil fuels (e.g. coal, gas, oil, wood). CO is difficult to detect because you cannot taste, see or smell it.
The fumes can be produced when appliances such as boilers, cookers, heaters, gas fires and solid fuel burners are faulty, have been incorrectly fitted, or not regularly serviced. It can also occur if flues, chimneys or vents are blocked or poorly maintained, either at home or at commercial premises.
One of the reasons behind the rise in carbon monoxide-related incidents could be driven by the increased cost of living in recent years, as people seek alternative ways to heat their homes, particularly during the colder months. Associated costs also mean that people may not be servicing their appliances as often as they should.
Assistant Commissioner for Prevention & Protection, Pamela Oparaocha, said: “As we enter some of the coldest months of the year, it’s natural to want to heat homes in a cost-effective way, but keeping warm must be done in a safe way.
“As many households look for ways to manage rising energy costs, it’s important to stay mindful of safety - especially during the colder months.
"Some alternative heating methods, while well-intentioned, can carry serious risks. For instance, burning treated wood might seem like a cost-saving option, but it can release toxic fumes and is more likely to spit embers, which could ignite nearby materials.
"Another key precaution is ensuring that carbon monoxide alarms are installed and working properly. Carbon monoxide is a silent and invisible danger—you can’t see, smell, or taste it, but it can be fatal within minutes.
"Taking small steps to stay safe can make a big difference. We encourage everyone to look out for themselves and their neighbours this winter."
CO alarms should be fitted in all rooms containing fuel burning appliances, ensuring that the alarm is able to be heard throughout the property. It is important that alarms are located in a places in homes that which will wake people if it sounds while they are asleep.
For more information on safer heating see the advice on the Brigade’s website. There is also support available to help with energy bills – you can contact your local authority and Citizens Advice can provide information on grants and benefits to assist in paying your energy bills.
Londoners can also make sure their homes are safe by using the Brigade’s online Home Fire Safety Checker, which provides tailored fire safety advice.