London Fire Brigade has reported that carbon monoxide incidents across London more than doubled between 2019/20 and 2024/25. According to the Brigade, firefighters responded to 1,714 incidents between August 2024 and July 2025 compared with 821 during the same period five years earlier. It said this represents a 108 per cent increase.
The Brigade added that a total of 7,764 carbon monoxide-related incidents have been recorded since August 2019. The Brigade confirmed that carbon monoxide was either suspected or confirmed in these cases. London Fire Brigade reported that it has issued safety warnings during Gas Safety Week to remind Londoners about the importance of regular maintenance.
It said the aim is to ensure people are not exposed to carbon monoxide. The Brigade added that the warnings coincide with a seasonal rise in heating use as colder weather approaches.
It explained that in September 2025, firefighters recorded raised levels of carbon monoxide at a food court on Kensington High Street, which required evacuation and ventilation before being declared safe.
The Brigade commented that this demonstrates how quickly such incidents can escalate.
The London Fire Brigade explained that carbon monoxide is produced by the incomplete burning of fossil fuels such as gas, coal, oil, or wood. It said appliances including boilers, heaters, cookers, and fires can release fumes if they are faulty, poorly installed, or not serviced regularly.
The Brigade advised that blocked or damaged chimneys, vents, or flues may also contribute to carbon monoxide incidents. It added that risks can occur in both homes and commercial premises. London Fire Brigade indicated that the increased cost of living may have contributed to the rise in incidents.
It said that people may be delaying replacing faulty appliances or avoiding annual servicing because of financial pressures. The Brigade added that some households are turning to alternative heating methods that carry higher safety risks. It advised that burning treated wood, for example, can release toxic fumes and create fire hazards.
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.
The Brigade advised that carbon monoxide alarms should be fitted in all rooms containing fuel burning appliances. It added that alarms should be positioned so that they can be heard throughout the property, including during sleep. Carbon monoxide remains a leading hazard for fire services because of its invisibility and speed of onset. The rise in London incidents highlights the importance of public education campaigns and monitoring of fuel-burning appliances. Professionals can support prevention by promoting carbon monoxide alarms, annual servicing, and safe installation practices.
