Certain groups of people are more at risk of carbon monoxide poisoning than others due to various factors such as age, health status, and living conditions.
Protecting these vulnerable groups is essential to prevent carbon monoxide poisoning.
The most at-risk groups include:
Children and Infants
Older people
Individuals with Chronic Health Conditions
Pregnant Women
Those living in fuel poverty
Infants and young children are more susceptible to the effects of carbon monoxide because their bodies and organs are still developing, and they have a higher metabolic rate. They may also be less able to communicate symptoms.
Faster Metabolism
Children generally have a faster metabolism than adults, meaning they breathe more rapidly and absorb gases more quickly. This increased metabolic rate can lead to a faster uptake of carbon monoxide into the bloodstream, making them more susceptible to the effects of carbon monoxide poisoning.
Higher Respiratory Rate
Children breathe at a faster rate than adults. This higher respiratory rate allows them to take in more air per unit of body weight. If the air contains carbon monoxide, children can inhale larger amounts of the gas in a shorter period, increasing the potential for toxicity.
Smaller Body Size
Due to their smaller body size, children have a smaller blood volume. This means that a given amount of carbon monoxide can cause a higher concentration in their blood compared to adults, leading to a more significant impact on oxygen transport.
Developing Central Nervous System
Children's central nervous systems, including the brain, are still developing. Carbon monoxide can interfere with the delivery of oxygen to developing organs and tissues, potentially causing long-term neurological damage in children.
Higher Oxygen Demand
Children have a higher oxygen demand relative to their body size. The binding of carbon monoxide to haemoglobin reduces the oxygen-carrying capacity of the blood. In children, who already have a higher oxygen demand, this reduction can have more severe consequences.
Limited Ability to Recognise Symptoms
Children may not recognise or be able to communicate the symptoms of carbon monoxide poisoning, such as headaches, dizziness, or nausea. This can delay the identification of exposure and timely medical intervention.
Longer Exposure Periods
In some situations, children may spend more time in enclosed spaces with potential sources of carbon monoxide, such as homes or cars. Longer exposure periods increase the risk of carbon monoxide accumulation and poisoning.
Increased Susceptibility to Hypoxia
Children may be more susceptible to hypoxia, where the body is deprived of adequate oxygen. Carbon monoxide interferes with oxygen transport in the blood, exacerbating the risk of hypoxia in children.
There are several ways that children and infants can be protected from exposure to carbon monoxide. Click here to read more about protecting children and infants.
Older adults are often more vulnerable to carbon monoxide poisoning because of several factors associated with ageing. They may have pre-existing health conditions, reduced lung function, or weakened immune systems that make them less able to withstand the effects of carbon monoxide exposure.
In 2017 PhD student Beth Cheshire from Lancaster University carried out research into levels of carbon monoxide present in the homes of older adults.
Working in conjunction with West Midlands and Merseyside Fire Services, the project gathered data on carbon monoxide levels, screening for cognitive function and mental health.
One of the goals of the project was to assist in the understanding of whether low-level and long-term exposure to carbon monoxide can be a risk factor in neurological disorders, such as dementia.
Read more about this project here.
Beth Cheshire presented the findings of her project during a CO Research Trust lecture.
Reduced Physiological Resilience
As individuals age, there is a natural decline in physiological resilience. Older adults may have compromised organ function, including the heart and lungs, making them more susceptible to the effects of carbon monoxide.
Weakened Immune System
The immune system weakens with age, affecting the body's ability to respond to stressors. Carbon monoxide exposure can strain the immune system, potentially leading to more severe health consequences in older individuals.
Pre-existing Health Conditions
Older individuals are more likely to have pre-existing health conditions, such as cardiovascular diseases or respiratory issues. These conditions can be exacerbated by carbon monoxide exposure, increasing the severity of health outcomes.
Slower Metabolism
Metabolic rates generally decrease with age. Older individuals may metabolize carbon monoxide more slowly, leading to a prolonged presence of the gas in the bloodstream and increased toxicity.
Decreased Lung Function
Aging is associated with a decline in lung function, including reduced lung capacity and efficiency. Impaired lung function can limit the body's ability to eliminate carbon monoxide, contributing to higher levels in the bloodstream.
Extended Exposure Periods
Older individuals may spend more time indoors, especially during extreme weather conditions. Extended periods indoors with inadequate ventilation and heating sources increase the risk of carbon monoxide exposure.
Impaired Cognitive Function
Cognitive impairment associated with aging can affect an individual's ability to recognise the symptoms of carbon monoxide poisoning. Older adults may not promptly identify or communicate signs of exposure.
Decreased Sensitivity to Cold
Older individuals may have a reduced sensitivity to cold temperatures, leading to the increased use of heating appliances. Inadequate maintenance of these appliances can contribute to carbon monoxide leaks.
There are several ways that older people can be protected from exposure to carbon monoxide. Click here to read more about protecting older adults.
In this blog Beth Cheshire goes into more detail about her project.
People with chronic respiratory conditions (e.g., asthma or chronic obstructive pulmonary disease), cardiovascular diseases, anaemia, or compromised immune systems are more susceptible to the harmful effects of carbon monoxide.
Exposure to carbon monoxide can exacerbate these conditions and lead to severe health problems.
Impaired Respiratory Function
Many chronic health conditions, such as chronic obstructive pulmonary disease (COPD), asthma, or interstitial lung disease, are associated with impaired respiratory function. The reduced capacity of the respiratory system can hinder the body's ability to eliminate carbon monoxide, leading to increased susceptibility.
Cardiovascular Diseases
Individuals with cardiovascular diseases, such as heart failure or coronary artery disease, already have compromised oxygen delivery to tissues. Carbon monoxide further diminishes the oxygen-carrying capacity of the blood, intensifying the strain on the cardiovascular system.
Anaemia
Chronic health conditions, including certain types of anaemia, can result in a decreased ability of the blood to carry oxygen. Carbon monoxide competes with oxygen to bind to haemoglobin, exacerbating the impact of anaemia on oxygen transport.
Neurological Disorders
Individuals with neurological disorders, such as Parkinson's disease or multiple sclerosis, may have altered sensorimotor functions. Impaired coordination and weakened responses to environmental hazards, including carbon monoxide, can increase the risk of exposure.
Weakened Immune System
Chronic health conditions often involve a compromised immune system. Carbon monoxide poisoning can further stress the immune system, making individuals more susceptible to infections and secondary complications.
Reduced Ability to Detect Symptoms
Some chronic health conditions can affect sensory perception or cognitive function. Individuals may have a reduced ability to recognise the symptoms of carbon monoxide poisoning, delaying the identification of exposure.
Extended Recovery Periods
Individuals with chronic health conditions may experience longer recovery periods and increased vulnerability to complications following exposure to carbon monoxide. The gas can contribute to the exacerbation of existing health issues.
There are several ways that people living with chronic health conditions can be protected from exposure to carbon monoxide.
Click here to read more about protecting people with chronic health problems here.
Pregnant women are at a greater risk of carbon monoxide poisoning due to several factors related to the physiological changes that occur during pregnancy.
Carbon monoxide can have adverse effects on both the mother and the developing foetus. Pregnant women should take extra precautions to avoid carbon monoxide exposure to protect their health and the health of their unborn child.
Foetal and neonatal death, congenital malformations and neurological problems occur with moderate to severe maternal exposure to carbon monoxide.
Studies conclude that at lower levels of exposure, adverse outcomes for the baby cannot be excluded. Washout of carbon monoxide from foetal blood takes longer than in adults, this and the lower partial pressure of oxygen in foetal blood and the relative hypoxia increase the effects of foetal exposure.
To date, no study to assess the environmental exposure of pregnant women to carbon monoxide has been undertaken in the UK.
To address this issue in 2020 iPiP was awarded a grant for a study looking at the exposure of pregnant women in their homes.
The study, which is still ongoing, will provide an understanding of pregnant women’s knowledge, attitudes, beliefs and concerns regarding exposure to carbon monoxide.
It will go on to develop potential approaches and interventions to help better protect pregnant women and their unborn children.
This study is being co-funded with the UK’s Gas Distribution Networks.
Read more about this project here.
Hilary Wareing from iPiP presented the interim findings of this project during a CO Research Trust lecture.
Increased Oxygen Demand
During pregnancy, there is an increased demand for oxygen to support the growing foetus. Carbon monoxide competes with oxygen for binding to haemoglobin in the blood, potentially leading to decreased oxygen delivery to vital tissues, including the placenta.
Changes in Haemoglobin Levels
Pregnancy is associated with changes in blood volume and haemoglobin levels. The increased blood volume can lead to a higher amount of circulating carbon monoxide, and changes in haemoglobin levels may affect the body's ability to transport oxygen.
Impaired Oxygen Transport to Foetus
Carbon monoxide can readily cross the placenta, exposing the developing foetus. The affinity of foetal haemoglobin for carbon monoxide is higher than that of maternal haemoglobin, making the foetus more susceptible to carbon monoxide-related oxygen deprivation.
Foetal Vulnerability
The developing foetus is particularly vulnerable to the effects of carbon monoxide because organs and tissues are rapidly forming. Oxygen is crucial for proper foetal development, and any disruption in oxygen supply can have lasting consequences.
Risk of Preterm Birth
Carbon monoxide exposure during pregnancy has been associated with an increased risk of preterm birth. Preterm birth can lead to a range of health issues for the newborn, including respiratory and developmental complications.
Neurological Effects on the Foetus
Carbon monoxide exposure during pregnancy can have neurotoxic effects on the developing foetal brain. This may contribute to cognitive and developmental challenges in the child.
Maternal Health Risks
Pregnant women may experience more severe health consequences from carbon monoxide exposure due to the physiological changes associated with pregnancy. These changes can affect the cardiovascular and respiratory systems, increasing the impact of carbon monoxide on maternal health.
Symptoms Mimic Pregnancy Symptoms
The symptoms of carbon monoxide poisoning, such as headaches, dizziness, and nausea, can mimic common pregnancy symptoms. This similarity may result in delayed recognition of carbon monoxide exposure, as symptoms may be attributed to pregnancy rather than poisoning.
There are several ways that pregnant women can be protected from exposure to carbon monoxide.
Click here to read more about protecting pregnant women.
Individuals living in fuel poverty face an elevated risk of carbon monoxide poisoning due to several interconnected factors related to their living conditions and challenges in accessing adequate heating and energy resources.
Fuel poverty occurs when households are unable to afford the energy required for a comfortable and healthy living environment.
There are recognised shortcomings in existing data on carbon monoxide exposure levels. Recorded deaths and injuries attributable to carbon monoxide poisoning have occurred across different tenancy types and socio-economic groups.
However, it may be safely assumed that there is a reasonable overlap between those households qualifying for Priority Services Register assistance and carbon monoxide exposure risk.
Results from a Department of Health study in 2011 suggested that one-fifth of lower-income households could regularly be exposed to carbon monoxide levels above WHO guidance.
The CO Research Trust funded a project carried out by National Energy Action. This research sought to understand carbon monoxide knowledge, behaviour and practices among low-income households.
Read more about this project here.
Inadequate Heating Systems
Fuel poverty often results in households using older or poorly maintained heating systems. Inadequate heating systems can lead to incomplete combustion of fuel, increasing the likelihood of carbon monoxide production.
Use of Unvented Appliances
Individuals in fuel poverty may rely on unvented appliances, such as portable heaters or stoves, as alternative heating sources. These appliances can produce carbon monoxide if not properly ventilated or maintained.
Poor Ventilation
Fuel-poor households may have limited access to proper ventilation. Inadequate ventilation can trap carbon monoxide indoors, especially in spaces where fuel-burning appliances are used.
Overcrowded Living Conditions
Overcrowded living conditions, often a consequence of fuel poverty, can exacerbate the risks of carbon monoxide exposure. Limited space may lead to inadequate ventilation, increasing the concentration of carbon monoxide in the air.
Incomplete Combustion
The use of outdated or malfunctioning heating appliances can result in incomplete combustion of fuel. Incomplete combustion produces higher levels of carbon monoxide, increasing the risk of exposure.
Lack of Maintenance
Individuals in fuel poverty may struggle to afford regular maintenance for heating appliances. Poorly maintained systems are more prone to leaks and malfunctions, leading to increased carbon monoxide emissions.
Reliance on Solid Fuels
Some households in fuel poverty may rely on solid fuels, such as wood or coal, for heating, as they may be cheaper than gas or electricity. Improper combustion of these fuels can release carbon monoxide into the indoor environment.
Limited Awareness and Education
Residents in fuel-poor households may have limited awareness of the dangers of carbon monoxide and the importance of proper appliance maintenance and ventilation.
Restricted Access to Modern Appliances
Fuel poverty can limit access to modern, safer heating appliances with built-in safety features. Older, less efficient appliances may lack the safeguards necessary to prevent carbon monoxide leaks.
To best protect these vulnerable groups from carbon monoxide poisoning, the following measures need to be put in place.
Install CO Alarms
Ensure that carbon monoxide alarms are installed in homes, particularly in bedrooms and common areas. Regularly test and replace the batteries or the entire alarm as needed.
Proper Ventilation
Ensure that homes and workplaces are adequately ventilated, especially when using fuel-burning appliances like stoves, furnaces, and fireplaces. Make sure vents and chimneys are clean and unobstructed.
Regular Appliance Maintenance
Regular maintenance should be carried out for fuel-burning appliances and heating systems to ensure they are functioning correctly and not emitting excess carbon monoxide. This includes water heaters and gas stoves.
Raise Awareness
Educate people, especially those in at-risk groups, about the dangers of carbon monoxide and the importance of safety measures. Encourage them to seek medical attention if they suspect carbon monoxide poisoning.
Medical Attention
If someone in an at-risk group exhibits symptoms of carbon monoxide poisoning, such as headache, dizziness, nausea, or confusion, seek immediate medical attention.
If you suspect you might have CO poisoning, please visit the NHS website immediately - Here.