The Health Risks of Asbestos Exposure: What You Need to Know

Published by JB Monitor Ltd | UKAS-accredited asbestos surveyors (Ref: 0294) | Last reviewed June 2026

Asbestos kills around 5,000 people in the UK every year. That is more than the number of people killed on Britain’s roads. Around 20 tradespeople die every week as a direct result of past exposure. It is responsible for more than 95% of all mesothelioma cases in men and nearly 85% in women. Globally, the World Health Organization estimates that 125 million people are exposed to asbestos in their workplaces.

These are not statistics from a distant industrial past. Asbestos-related diseases typically take 20 to 50 years to develop after exposure, which means that people dying today were exposed during the 1970s, 1980s and 1990s – and that the consequences of more recent exposures are still to come.

Asbestos was banned in the UK in 1999, but that ban does not make the risk disappear. It simply shifts it. The material is still present in an estimated two million commercial premises and around three million domestic and residential buildings across the UK. Any building constructed or refurbished before the year 2000 may contain asbestos-containing materials (ACMs), and those materials pose a risk whenever they are disturbed, damaged or deteriorate with age.

This guide explains what asbestos is, why it is dangerous, what diseases it causes, who is most at risk and what factors affect the likelihood of harm. It draws on guidance from the HSE, NHS, Cancer Research UK, the National Cancer Institute, Mayo Clinic, the Royal College of Nursing, the Lancet and the Agency for Toxic Substances and Disease Registry.

Which Building Materials Contain Asbestos – and Which Are Most Dangerous When Disturbed?

Understanding where asbestos is commonly found in buildings is essential for anyone who owns, manages or works in a structure built before 2000. Asbestos was incorporated into an enormous range of construction products, and its presence is rarely obvious to the untrained eye. It cannot be identified by appearance alone – laboratory analysis of a sample is the only reliable confirmation, which is why a professional asbestos management survey is the essential first step for any duty holder.

Not all asbestos-containing materials carry the same level of risk. The key factor is friability – how readily the material releases fibres when disturbed. Highly friable materials are far more dangerous than bonded materials where the fibres are tightly locked into a matrix. The following are the most commonly encountered ACMs in UK buildings, listed broadly in order of fibre release risk:

• Sprayed asbestos coatings – applied as fire protection to structural steelwork or for acoustic insulation. Asbestos content of 55% to 85%. Extremely friable – even structural vibration can release fibres. The highest-risk ACM in any building.
• Pipe and boiler lagging – thermal insulation on pipes, boilers and vessels. Asbestos content up to 85% in some lagging materials. Highly friable, particularly when deteriorating. A major source of occupational exposure historically.
• Asbestos insulating board (AIB) – fire-retardant board used extensively for ceiling tiles, partition walls, door facings and heater cupboards. Asbestos content typically 15% to 40%. Medium friability – significant fibre release when cut, drilled or broken.
• Textured decorative coatings (Artex) – applied to ceilings and walls from the 1950s to the late 1990s. Typically chrysotile at 2% to 5% content. Risk is low when intact but increases significantly if sanded, drilled or scraped.
• Asbestos cement – used in roofing sheets, cladding, guttering, downpipes and water tanks. Chrysotile content of 10% to 15%, tightly bound in the cement matrix. Lower friability than other ACMs, but can release fibres if badly damaged or broken up.
• Floor tiles and adhesive – thermoplastic floor tiles manufactured before the mid-1980s frequently contained chrysotile at up to 25%. The bitumen adhesive beneath them may also contain asbestos.
• Roofing felt – bitumen-based felt used as an underlay beneath roof coverings can contain chrysotile.
• Millboard and paper products – used as electrical insulation, fire protection around boiler panels and behind switchgear.
• Rope, gaskets and seals – found in older boiler systems, heating plant and industrial machinery. Frequently overlooked during surveys of plant rooms.

If you suspect any of these materials are present in your building and may be in poor condition or at risk of disturbance, do not attempt to sample or interfere with them yourself. Contact a UKAS-accredited surveyor to assess the material safely.

What Is Asbestos and Why Is It So Dangerous?

Asbestos is a group of naturally occurring fibrous silicate minerals that were prized throughout the twentieth century for their extraordinary physical properties – thermal resistance, high tensile strength, fire resistance, chemical durability and sound insulation. These qualities made asbestos invaluable to builders, shipbuilders, manufacturers and engineers. They also made it lethal.

There are six types of asbestos, divided into two groups. Serpentine asbestos – the chrysotile or white asbestos group – has long, curly, flexible fibres. Amphibole asbestos – which includes crocidolite (blue), amosite (brown), tremolite, actinolite and anthophyllite – has straight, rigid, needle-like fibres. All forms are classified as Group 1 carcinogens by the International Agency for Research on Cancer (IARC) and the World Health Organization. All are regulated and prohibited in the UK. Blue and brown asbestos are considered the most hazardous, but white asbestos is now also recognised as harmful and should not be treated as safe.

The danger is not in seeing or touching asbestos. It is in breathing it in. When asbestos-containing materials are disturbed, damaged or deteriorate, microscopic fibres are released into the air. These fibres are invisible to the naked eye – asbestos fibres can be a thousandth of the diameter of a human hair. They are so fine that they can remain airborne for days or even weeks after disturbance. Once inhaled, they travel deep into the lungs, where the body cannot expel or break them down.

What makes asbestos uniquely dangerous compared to other hazardous dusts is its crystalline structure. As the material is crushed or disturbed, it fractures along the same planes, producing fibres that become progressively smaller but retain their needle-like shape. These fibres can penetrate deep into lung tissue, work their way into cells and – in some cases – interact directly with DNA, triggering mutations that lead to cancer. The body’s immune response attempts to encapsulate the fibres in scar tissue, but this process creates its own harm: progressive scarring of the lung, loss of function and, in some cases, cancer.

The latency period between exposure and disease is long – typically 20 to 50 years. By the time symptoms appear, the disease is often advanced and difficult to treat. This is why prevention and early identification of asbestos are so critical.

The Four Diseases Caused by Asbestos

Mesothelioma

Mesothelioma is a cancer that affects the mesothelium – the thin layer of tissue that lines the lungs (the pleura), the abdomen (the peritoneum), and other organs. Pleural mesothelioma, affecting the lining of the lungs, is the most common form. It is almost exclusively caused by asbestos exposure. In the UK, asbestos exposure accounts for more than 95% of mesothelioma cases in men and nearly 85% in women.

Mesothelioma can take 15 to 60 years to develop after initial exposure. By the time it is diagnosed, it is almost always fatal. There is no cure. Treatment focuses on managing symptoms, improving quality of life and, in some cases, extending survival through chemotherapy, immunotherapy or surgery. The UK currently has one of the highest rates of mesothelioma in the world, a direct consequence of the heavy industrial use of asbestos in shipbuilding, construction and manufacturing from the 1940s through to the 1980s.

Mesothelioma is not confined to those who worked directly with asbestos. Secondary exposure – through contact with asbestos-contaminated clothing, for example – is a documented cause. Family members who laundered the work clothes of asbestos workers have developed mesothelioma. People living close to asbestos mines or heavily contaminated sites have also been affected. A study published in The Lancet Public Health found a more than doubling of mesothelioma risk in men who had lived in residential properties contaminated with asbestos insulation.

Asbestos-Related Lung Cancer

Asbestos is a recognised cause of lung cancer. Asbestos-related lung cancer is clinically indistinguishable from lung cancer caused by smoking or other factors. It is estimated that for every mesothelioma death, there is approximately one asbestos-related lung cancer death – meaning the true toll of asbestos on lung cancer mortality is as large again as the mesothelioma death toll.

The relationship between asbestos and smoking is particularly serious. Research consistently shows that the combination of smoking and asbestos exposure is far more dangerous than either risk factor alone. Smokers who are also exposed to asbestos have a risk of developing lung cancer that is greater than the risks from asbestos and smoking added together – the two factors interact multiplicatively rather than simply adding together. People who were exposed to asbestos at any point in their life should not smoke.

Asbestosis

Asbestosis is a chronic, progressive lung disease caused by prolonged heavy exposure to asbestos fibres. The fibres lodge in the alveoli – the tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged – where they cause scarring (fibrosis) of the lung tissue. As the scarring progresses, the lungs become increasingly stiff and unable to expand and contract normally. This causes shortness of breath that worsens over time, a persistent dry cough, chest tightness and, in advanced cases, clubbing of the fingers and toes.

Asbestosis typically results from sustained heavy exposure over many years rather than brief or incidental contact. There is no cure. Treatment focuses on managing symptoms – oxygen therapy, pulmonary rehabilitation, inhalers – and reducing the risk of further deterioration. In severe cases, asbestosis can be fatal. People with asbestosis are also at significantly increased risk of lung cancer. Smoking accelerates the progression of the disease and further increases cancer risk.

Pleural Thickening and Pleural Plaques

Pleural disease covers a range of conditions affecting the pleura – the thin membrane that lines the lungs and chest wall. These conditions include pleural plaques (localised areas of thickening on the pleural lining), diffuse pleural thickening (more widespread thickening that can constrict the lung) and benign pleural effusions (fluid accumulation between the lung and chest wall).

Pleural plaques themselves are not precursors to lung cancer and are often symptomless. However, their presence confirms past asbestos exposure and indicates that other ACM-related conditions may develop. Diffuse pleural thickening is more serious – when extensive, it can significantly restrict lung capacity and cause shortness of breath and chest discomfort. Evidence suggests that people with pleural disease caused by asbestos exposure may be at increased risk for lung cancer.

Who Is Most at Risk?

Anyone who is regularly exposed to airborne asbestos fibres is at risk. Risk is closely related to the dose received – the concentration of fibres in the air, the duration of exposure and the frequency of exposure all influence the likelihood of developing a disease.

Those at highest risk are workers who have been repeatedly exposed to asbestos over many years, particularly in the following industries and trades:

• Construction and building maintenance – especially work on pre-2000 buildings involving insulation, ceiling tiles, pipe lagging, AIB or textured coatings
• Shipbuilding – historically one of the highest-exposure industries in the UK
• Heating and ventilation engineering – boiler work, pipe fitting and ductwork in older buildings
• Electrical work – running cables and working behind panels in pre-2000 buildings
• Plumbing – work on older pipe systems with asbestos lagging
• Roofing – asbestos cement roof sheets were widely used on industrial and agricultural buildings
• Demolition and refurbishment – work that disturbs the fabric of older buildings
• Car mechanics – historically, vehicle brake pads and clutches contained asbestos
• Fire and emergency services – firefighters entering burning or damaged buildings
• Teachers and healthcare workers – building occupants in pre-2000 school and hospital estates where ACMs are in poor condition

Secondary or household exposure is also a recognised risk. Family members of workers who brought asbestos fibres home on their clothing, hair or skin have developed asbestos-related diseases – including mesothelioma – without any direct occupational exposure of their own.

It is also important to recognise that people living or working in buildings where asbestos-containing materials have deteriorated or been disturbed can be exposed without being aware of it. Asbestos fibres are invisible and odourless. There is no way to detect exposure without asbestos air testing.

What Factors Affect Individual Risk?

Not everyone who is exposed to asbestos will develop an asbestos-related disease. Several factors influence individual risk:

• Dose – the amount of asbestos fibre inhaled is the single most important factor. Higher concentrations and longer exposure periods increase risk significantly.
• Duration – prolonged occupational exposure carries far greater risk than brief or incidental contact. The HSE confirms that short-term exposures of low intensity are unlikely to have long-term health effects for most people.
• Fibre type – amphibole fibres (blue and brown asbestos) tend to remain in the lungs for longer than chrysotile (white asbestos) fibres and are more strongly associated with mesothelioma risk.
• Fibre size – very fine fibres that penetrate deep into the lung are more hazardous than larger fibres that the respiratory system can expel through coughing.
• Smoking – the combination of asbestos exposure and smoking dramatically increases lung cancer risk. Smokers who have been exposed to asbestos should seek advice from their GP.
• Pre-existing lung conditions – people with asthma, COPD or other chronic lung conditions may be more vulnerable to the effects of asbestos exposure.
• Genetic factors – research has identified that germline mutations in the BAP1 gene significantly increase susceptibility to mesothelioma following asbestos exposure.
• Age at first exposure – younger people exposed to asbestos carry a greater lifetime risk of developing mesothelioma, because of the long latency period and their greater remaining life expectancy.
• Lack of awareness – workers who have not received asbestos awareness training are significantly more likely to unknowingly disturb ACMs, increasing their own exposure and that of people around them.

Symptoms to Be Aware Of

Asbestos-related diseases often cause no symptoms for many years or even decades. When symptoms do appear, they can easily be mistaken for other conditions – which is one reason mesothelioma is frequently diagnosed at an advanced stage. Anyone with a known history of asbestos exposure should be alert to the following symptoms and discuss them with their GP promptly:

• Persistent cough – particularly one that worsens over time
• Shortness of breath or difficulty breathing
• Chest pain or tightness
• Wheezing
• Unexplained fatigue
• Unexplained weight loss
• Swelling of the face or neck
• Coughing up blood or blood-stained mucus
• Clubbing of the fingertips – where the fingers become wider and rounder at the tips

If you have any of these symptoms and have a history of asbestos exposure – either occupational or environmental – do not delay seeking medical advice. Tell your GP about your exposure history, when it occurred, how long it lasted and in what circumstances. This information is important for accurate diagnosis. Symptoms of asbestos-related disease can take 20 to 50 years to appear after initial exposure, so even distant past exposure is relevant.

Is There a Safe Level of Asbestos Exposure?

This is one of the most commonly asked questions about asbestos. The honest and authoritative answer is that no level of asbestos exposure has been conclusively shown to be without risk. The WHO, IARC and Cancer Research UK all state that there is no known safe threshold for asbestos exposure in relation to cancer risk.

What this means in practice is that the goal must be prevention – keeping exposure to zero wherever possible – rather than managing exposure to a threshold that is deemed acceptable. The legal control limit in the UK (0.1 fibres per cubic centimetre of air) is an occupational safety limit – a level that must not be exceeded in the workplace. It does not define a safe exposure level. It defines a regulatory ceiling.

For most people who have had brief, incidental or low-level contact with asbestos – for example, opening a cupboard in an older house or working near asbestos materials that were in good condition – the absolute risk of developing an asbestos-related disease is low. The HSE confirms that short-term low-intensity exposures are unlikely to lead to long-term ill health effects for most individuals. However, this does not mean the risk is zero, and it does not reduce the importance of preventing unnecessary exposure.

Frequently Asked Questions About Asbestos Health Risks

Can a one-off or brief exposure to asbestos cause disease?

Brief, low-level exposure carries a much lower risk than prolonged occupational exposure. The HSE confirms that short-term exposures are unlikely to lead to long-term ill health effects for most people. However, OSHA has noted that exposures as short as a few days have caused mesothelioma in some individuals, particularly where fibre concentrations were high. There is no completely safe level of exposure.

How long after exposure do symptoms appear?

Asbestos-related diseases have a very long latency period. Symptoms typically do not appear until 20 to 50 years after the initial exposure. Mesothelioma can take up to 60 years to develop. This makes early medical disclosure of any asbestos exposure history essential – even if the exposure happened decades ago.

Is white (chrysotile) asbestos safer than blue or brown asbestos?

White asbestos (chrysotile) was historically considered less dangerous than blue (crocidolite) or brown (amosite) asbestos. However, all three types are now classified as Group 1 carcinogens by the IARC and WHO. White asbestos can and does cause mesothelioma, lung cancer and asbestosis. It should not be treated as safe.

Does asbestos only affect the lungs?

No. While lung disease and pleural mesothelioma are the most common asbestos-related conditions, the IARC has established sufficient evidence that asbestos causes cancer of the larynx and ovary. There is also evidence of links to cancer of the pharynx, stomach and colorectum. Peritoneal mesothelioma – cancer of the abdominal lining – is caused by swallowing asbestos fibres, which occurs when fibres are coughed up from the lungs and then ingested.

Does smoking make asbestos exposure more dangerous?

Yes – significantly. The combination of asbestos exposure and smoking dramatically increases the risk of lung cancer, far beyond what either risk factor would produce individually. Smokers who have been exposed to asbestos should speak to their GP about cessation support and monitoring.

What should I do if I think I have been exposed to asbestos?

If you believe you have been exposed to asbestos – particularly if it was occupational, prolonged or at high intensity – inform your GP and provide as much detail as possible about the nature, timing and duration of the exposure. Ask for this to be recorded in your medical notes. If you are experiencing any respiratory symptoms, request a chest X-ray. Do not smoke. Monitor your health and report any new or worsening symptoms promptly.

Can I claim compensation for an asbestos-related disease?

If you have developed an asbestos-related disease as a result of occupational exposure, you may be entitled to compensation through a personal injury claim. You may also be eligible for Industrial Injuries Disablement Benefit (IIDB) or, in the case of mesothelioma, the Diffuse Mesothelioma Payment Scheme (DMPS). Seek advice from a specialist asbestos disease solicitor as early as possible, as time limits apply.

How JB Monitor Can Help Protect You and Your Building

The most effective protection against asbestos-related disease is prevention – identifying where asbestos is present, assessing its condition and managing it so that fibres are never released into the air. Known ACMs left in place must be subject to periodic asbestos reinspections to monitor for deterioration. For duty holders responsible for non-domestic premises, this is not just best practice; it is a legal requirement under the Control of Asbestos Regulations 2012.

JB Monitor Ltd is a UKAS-accredited asbestos surveying company based in Colwyn Bay, North Wales, with a second office in Didsbury, Manchester. Our surveyors hold BOHS qualifications (P402, P403, P404) and carry out all surveys in accordance with HSG264. Our in-house laboratory is UKAS-accredited for bulk sampling and analysis (Ref: 2075) and processes samples to HSG248 using HSE-approved methods. We also help duty holders develop and implement asbestos management plans that meet their full legal obligations under CAR 2012.

We provide:

• Asbestos management surveys and refurbishment and demolition surveys – identifying and assessing ACMs in your building
• Bulk sampling and laboratory analysis – fast, accurate results from our in-house Colwyn Bay laboratory
• Asbestos air monitoring – clearance testing and background monitoring to confirm fibre levels are safe
• Asbestos re-inspections – periodic condition monitoring of known ACMs
• Asbestos consultancy – management plan development and compliance support for duty holders
• Asbestos awareness training – Module 1 Basic Awareness and Module 2 Duty to Manage

To arrange a survey or speak to our team about your asbestos obligations, call 01492 536 444 (North Wales) or 0161 359 3684 (Manchester), or email [email protected].

Further Reading and Official Sources

• Why is asbestos dangerous? – Health and Safety Executive
• Asbestosis – NHS
• Asbestos and mesothelioma risks – Cancer Research UK
• Asbestos exposure and cancer risk – National Cancer Institute
• Health effects of asbestos – ATSDR
• Elimination of asbestos-related diseases – World Health Organization