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Asbestos FAQ's

Why is asbestos dangerous?

Asbestos fibres are present in the environment in Great Britain so people are exposed to very low levels of fibres. However, a key factor in the risk of developing an asbestos-related disease is the total number of fibres breathed in. Working on or near damaged asbestos-containing materials or breathing in high levels of asbestos fibres, which may be many hundreds of times that of environmental levels could increase your chances of getting an asbestos-related disease.

When these fibres are inhaled they can cause serious diseases which are responsible for around 4000 deaths a year. There are four main diseases caused by asbestos: mesothelioma (which is always fatal), lung cancer (almost always fatal), asbestosis (not always fatal, but it can be very debilitating) and diffuse pleural thickening (not fatal).

Remember, these diseases will not affect you immediately but later on in life, so there is a need for you to protect yourself now to prevent you contracting an asbestos-related disease in the future. It is also important to remember that people who smoke and are also exposed to asbestos fibres are at a much greater risk of developing lung cancer.

Diffuse pleural thickening


  • Diffuse pleural thickening is another disease associated with exposure to asbestos.
  • There were 400 new cases of disablement in the year 2008 due to this disease, although this figure is likely to be a substantial underestimate. The annual number increased during the 1990s but has remained fairly stable over recent years.
  • The increase may be partly or wholly explained by the acceptance of claims under the Industrial Injuries Disablement Benefit (IIDB) scheme for unilateral (affecting only one lung) cases and other changes in data collection methods.
  • An estimated 1063 cases of benign (non-cancerous) pleural disease - mostly attributable to asbestos - were seen for the first time by occupational and chest physicians who reported to the THOR surveillance schemes in 2008.


The pleura is a two-layered membrane which surrounds the lungs and lines the inside of the rib cage. Some asbestos fibres inhaled into lungs work their way out to the pleura and may cause fibrosis or scarring to develop there. This causes the pleura to thicken and this may show up on a chest X-ray or CT scan. Pleural thickening occurs in two forms:

  • Diffuse pleural thickening extends over a large area and may restrict expansion of the lungs, leading to breathlessness; and
  • Pleural plaques are localised areas of pleural thickening, that don’t usually interfere with breathing.

Scale of disease including trends

An upward trend in the annual number of cases assessed for disablement benefit occurred during the 1990s but with more stable numbers of around 400 per year since 2003. The larger numbers of assessed cases in recent years may be connected with the admission of unilateral cases of disease (i.e. cases where only one lung is affected) from April 1997. Previously, Department for Work and Pensions regulations limited compensation to cases of bilateral disease, where both lungs are affected. In April 2002 a new method of collecting statistical information on claims and assessments was introduced, making the data more accurate. The large increase in cases in 2002 (380 cases compared 290 in 2001) is likely to be at least partly because of this rather than a true rise in claims. In addition the figures from April 2002 onwards include assessments where the claimant has been found to be suffering, but where there has been no loss of faculty.

The numbers of cases of pleural thickening and similar disorders reported via occupational and chest physicians under the THOR surveillance scheme under the heading of benign (non-cancerous) pleural disease, nearly all of them attributed to asbestos, are appreciably larger than those for IIDB cases. There were an estimated 1063 such cases in 2008 compared with 1008 in 2007. These numbers will include many cases falling outside the DWP definitions - in fact, analyses of SWORD data over the 5-year period 2002-2006 indicate that about three quarters of cases were classified by participating physicians as “predominantly plaques” with most of the remainder as “diffuse pleural disease” and only a small proportion as “asbestos-related pleural effusions”. Given that pleural plaques are usually asymptomatic and few of the cases reported to SWORD had other diagnoses of asbestos related disease in addition to plaques, this suggests that many of these cases were identified (via chest x-rays) following referral of individuals to chest physicians for other respiratory conditions - rather than because of the plaques themselves. The fact that appreciable numbers of pleural plaques are identified each year in this way suggests that there are likely to be substantially more individuals in the population with plaques than identified by SWORD.

Asbestos-related lung cancer


Asbestos has been recognised as an important risk factor for lung cancer for many years. However, there are a number of other agents that can cause the disease - most importantly, tobacco smoke - and lung cancers resulting from asbestos exposure are clinically indistinguishable from those caused by these other agents. This means that the total number of asbestos related lung cancers has to be derived from statistical estimates based on evidence from epidemiological studies rather than direct counting of individual cases.

  • It is likely that there are around as many asbestos related lung cancer deaths in Great Britain annually as there are mesothelioma deaths. There were 2156 mesothelioma deaths in 2007.
  • There were 240 recorded new cases of disablement in 2008 due to asbestos-related lung cancer and 79 reports of lung cancer in the THOR scheme, not all of which were asbestos-related. These numbers are substantially lower than the likely annual total number of deaths inferred from the number of mesotheliomas.


Mesothelioma is a formerly rare form of cancer which affects the pleura (the lining of the lungs) and the peritoneum (the lining surrounding the lower digestive tract). In the majority of cases mesothelioma is rapidly fatal following diagnosis so mesothelioma death statistics give a clear indication of the disease incidence. Mesothelioma is closely related to asbestos and many cases, particularly among men, are a result of exposures in occupational settings. However, mesothelioma has been reported in some individuals without any known exposure to asbestos. The long delay between initial exposure to asbestos and death from mesothelioma is typically between 30 and 40 years. This means that deaths occurring now and most of those expected to occur in the future reflect industrial conditions of the past rather than current work practices.

  • The total number of mesothelioma deaths has increased from 153 in 1968 to 2156 in 2007.
  • The most frequently recorded occupations on death certificates of men now dying from mesothelioma include carpenters and joiners; plumbers, heating and ventilating engineers; and electricians and electrical fitters.
  • The expected number of deaths amongst males is predicted to increase to a peak of 2038 (90% prediction interval: 1929 to 2156) around the year 2016.


  • Based on Death certificates where asbestosis is described as being the underlying cause there were 96 deaths due to the disease in 2007.
  • There were 380 deaths in total in 2007 where the death certificate mentioned the term "asbestosis", and 66 of these are also included on the mesothelioma register because the death certificate also mentioned the term "mesothelioma".
  • Disablement benefit cases for asbestosis have risen erratically since the early 1980s, with the trend increasing strongly from the late 1990s through to the middle of the new millennium. The number of cases for 2008 is 795.


Asbestosis is defined as lung fibrosis caused by the inhalation of asbestos fibres. Diagnosis is made on the basis of clinical features, X-ray appearances and a history of heavy asbestos exposure. It is generally recognised that heavy asbestos exposures are required in order to produce clinically significant asbestosis within the lifetime of an individual. Current trends therefore still largely reflect the results of heavy exposures in the past.

Overall scale of disease including trends

The Health and Safety Executive maintains a register of all deaths where death certificates mention asbestosis. These deaths include those where the underlying cause is specifically identified as asbestosis, but also those with other underlying causes but where asbestosis was nevertheless mentioned in the textual description of the cause of death. (The underlying cause of death is defined as the disease or injury that initiated the train of morbid events leading directly to death.) Thus the total number of deaths on the asbestosis register gives an indication of the number of individuals who were suffering from asbestosis when they died. In 2007 there were 380 deaths where the death certificate mentioned asbestosis and of these 96 had asbestos recorded as the underlying cause of death.

Interpretation of these figures is complicated by two issues:

Cases of asbestosis may sometimes not be recorded as such because they may be mistaken for other types of lung fibrosis or may go undiagnosed.

The word "asbestosis" is often mentioned on death certificates along with other asbestos-related diseases - i.e. mesothelioma and/or lung cancer. On some death certificates the wording of the cause of death description suggests that the term has been used incorrectly to indicate the role of asbestos in causing mesothelioma and/or lung cancer, rather than the presence of asbestos-induced lung fibrosis per se. This is particularly the case for mesothelioma, where the phrase "industrial disease of asbestosis" is often used when mesothelioma is given as a cause of death

Asbestos related disease

There are four main diseases associated with inhalation of asbestos fibres. These are asbestosis (a scarring of the lung tissue caused by asbestos), two kinds of cancer (mesothelioma and asbestos related lung cancer), and diffuse pleural thickening (a non-malignant disease affecting the lung lining). The latest available statistics for each of these diseases are reported and discussed in the following sections:

  • Asbestosis
  • Mesothelioma
  • Asbestos-related lung cancer
  • Diffuse pleural thickening

Current evidence suggests that asbestos can also cause laryngeal cancer and may be implicated in causing pharyngeal, stomach and colorectal cancers.

How do I deal with asbestos waste?

Make sure you double-bag it and label as asbestos waste. You can then get in contact with the Local Authority or Environment Agency to find out if they will assist you in disposing of it, they may charge for this service. Alternatively, you can contact the Environment Agency.

Are you sure that you don’t come in to contact with asbestos?

If you work in any of the following occupations, and are working on a building built or refurbished before 2000, you may come in to contact with asbestos:

  • Heating and ventilation engineers
  • Demolition workers
  • Carpenters and joiners
  • Plumbers
  • Roofing contractors
  • Painters and decorators
  • Plasterers
  • Construction workers
  • Fire and burglar alarm installers
  • Shop fitters
  • Gas fitters
  • Computer installers
  • General maintenance staff eg caretakers
  • Telecommunications engineers
  • Building surveyors
  • Cable layers
  • Electricians

This list does not include all occupations where you may come in to contact with asbestos. Some of the places where you may find it can be found in the HSE’s interactive diagram available on

It’s not easy to tell asbestos from how it looks, and it needs to be properly identified in a specialist laboratory. But here are a few examples:

  • Asbestos used as packing between floors and in partition walls
  • Sprayed (‘'impet') asbestos on structural beams and girders
  • Lagging on pipework, boilers, calorifiers, heat exchangers etc
  • Asbestos insulating board - ceiling tiles, partition walls, service duct covers, fire breaks, heater cupboards, door panels, lift shaft lining, fire surrounds, soffits etc.
  • Asbestos cement products such as roof and wall cladding, bath panels, boiler and incinerator flues, fire surrounds, gutters, rainwater pipes, water tanks etc.
  • Other products such as floor tiles, mastics, sealants, rope seals and gaskets (in pipework etc.), millboard, paper products, cloth (fire blankets, etc.) and bituminous products (roofing felt, etc)

Some of the examples listed above can only be carried out by a contractor who has been granted a licence from HSE.

When am I at risk?

You are mostly at risk when:

  • You are working on an unfamiliar site
  • The building you are working on was built before the year 2000
  • Asbestos-containing materials were not identified before the job was started
  • Asbestos-containing materials were identified but this information was not passed on by the people in charge to the people doing the work
  • You don’t know how to recognise and work safely with asbestos
  • You know how to work safely with asbestos but you choose to put yourself at risk by not following proper precautions, perhaps to save time or because no one else is following proper procedures

Remember, as long as the asbestos is not damaged or located somewhere where it can be easily damaged it won’t be a risk to you.

  • You can’t see or smell asbestos fibres in the air.
  • The effects of asbestos take many years to show up - avoid breathing it in now.
  • Smoking increases the risk many times.
  • Asbestos is only a danger when fibres are made airborne
How great is the combined risk of lung cancer due to asbestos exposure and smoking?

It is widely accepted that tobacco smoke interacts with asbestos in the causation of lung cancer. This means that the risk of lung cancer for a smoker exposed to asbestos is greater than the sum of the individual effects due to smoking and due to asbestos

Is there a safe level of exposure below which there is no risk?


There is a lack of scientific consensus as to whether there exists a threshold of exposure to asbestos below which a person is at zero risk of developing mesothelioma. However, there is evidence from epidemiological studies of asbestos exposed groups that any threshold for mesothelioma must be at a very low level - and it is fairly widely agreed that if a threshold does exists then it cannot currently be quantified. For practical purposes HSE does not assume that such a threshold exists.

Asbestosis and lung cancer

The situation for lung cancer and asbestosis is uncertain. Arguments for a threshold for lung cancer are based on the notion of the carcinogenic process being an extension of the chronic inflammatory processes producing fibrosis. It is generally recognised that heavy doses of white asbestos are required to produce clinically significant lung fibrosis. However, the situation for blue and brown asbestos is more uncertain and fibrosis has been observed at much lower exposures. This also suggests that if a threshold for lung cancer does exist for blue and brown asbestos it must be at a very low level indeed.

How do the risks from exposure to different kinds of asbestos differ?

Though chrysotile (white asbestos) has been used most widely, the greater potency of amphibole (blue and brown) asbestos to cause illness is generally recognised. Hodgson and Darnton in their scientific paper (2000) estimated the risk of mesothelioma and lung cancer by asbestos fibre type for a range of different exposure scenarios. This analysis suggests that on average blue asbestos has a risk about 500 times that of white asbestos for mesothelioma and 10-50 times as high for lung cancer. The equivalent risk ratio for brown asbestos is 100 for mesothelioma and the same as blue (10-50) for lung cancer.

My occupation was identified as high risk. Does this mean that I should be worried?

This doesn’t necessarily mean all workers in the occupation have a high risk. What the analysis of occupational groups demonstrates is which occupations on average have a higher risk associated with working in them. The true nature of any risk will crucially depend on the timing and amount of asbestos inhaled. In any case, since mesothelioma has a long latency and because death certificates (upon which statistics are based) only record the last occupation of the deceased, the occupation recorded may not be the one that resulted in the asbestos exposure. Consequently, part of the risk for a given occupation may be because workers exposed in other jobs have moved into this line of work towards the end of their careers.

Does my area have an asbestos problem?

This most likely means that your area had a relatively low number of mesotheliomas. The geographical distribution of mesothelioma deaths is affected by the fact that death certificates (upon which statistics are based) only record the last address of residence. Thus people may have had heavy exposures to asbestos in the past in the traditional high-risk industries located within certain geographical areas, and then moved to areas of a relatively lower risk before dying from mesothelioma. Also, the effect of the risk of more general exposures across a wider range of occupations (e.g. exposure to maintenance workers in buildings) is likely to affect all geographical areas and is thus likely to be most noticeable in those that have traditionally been of lowest risk.

My local/unitary authority area is identified as having a high risk of mesothelioma.

High-risk areas tend to be those containing, or near to, industrial sites where asbestos was used extensively in the past - for example, shipyards, asbestos manufacturing factories and railway engineering works. This will usually mean that the area has a higher proportion of people who have worked in these industries than the average for the country, and excess mesotheliomas are likely to occur in people who have worked in them. In some cases there may have been a general environmental risk in places close to these sites in the past. Individual risk has more to do with occupation rather than geographical location of residence. Nowadays, those working in building maintenance trades are likely to be at highest risk

What is being done to reduce risks from asbestos?

Much has been done to control the risk from asbestos. Work with asbestos generally requires a licence and the use of strict control measures, including personal protective equipment such as respirators. The fact that a wide range of people now have the potential to be exposed to asbestos - particularly workers involved in building maintenance - has led to the latest set of Regulations - The Control of Asbestos Regulations 2006. This came into force on 13 November 2006 (Asbestos Regulations - SI 2006/2739) and brings together three previous sets of Regulations covering the prohibition of asbestos, the control of asbestos at work and asbestos licensing. The Regulations prohibit the importation, supply and use of all forms of asbestos and they continue the ban introduced for blue and brown asbestos in 1985 and for white asbestos in 1999. They also continue to ban the second-hand use of asbestos products such as asbestos cement sheets and asbestos boards and tiles; including panels which have been covered with paint or textured plaster containing asbestos.

The Asbestos Regulations also include the ‘duty to manage asbestos’ in non-domestic premises. Guidance on the duty to manage asbestos can be found in the Approved Code of Practice The Management of Asbestos in Non-Domestic Premises, L127

Which occupations are associated with the highest mesothelioma risks?

Based on an analysis of the last recorded occupation for mesothelioma deaths during 2002 - 2005, the ten occupations found to have the highest risk of mesothelioma for males were Carpenters, Plumbers, Electricians, Labourers in Other Construction Trades, Metal Plate Workers, Pipe Fitters, Construction Operatives, Managers in Construction, Construction Trades and Energy Plant Operatives. The occupations most frequently recorded on deaths certificates of men dying from mesothelioma today include may that are associated with construction and building maintenance trades, highlighting the important role of past exposures to “end users” of asbestos containing materials in the building industry.

How many cases of non-malignant asbestos-related disease are there each year and what are the trends over time?
  • There were 96 deaths in 2007 where asbestosis is described as the underlying cause of death on the death certificate.
  • The annual number of new cases of asbestosis according to the Department of Work and Pensions (DWP) Industrial Injuries and Disablement Benefit (IIDB) scheme (which compensates workers for prescribed occupational diseases) has risen erratically since the early 1980s, with the trend strongly increasing since the early 1990s reaching the current level of 795 in 2007. This is likely to be an underestimate of the total number of cases.
  • There were 400 new cases of disablement benefit for diffuse pleural thickening in 2008.
  • The trend in diffuse pleural thickening has increased over recent years, although this may be partly or wholly explained by the acceptance of claims under the IIDB scheme for unilateral (affecting only one lung) cases and other changes in data collection methods.
So what does HSE now think the current annual total number of asbestos related cancer deaths is?

In 2007 (the latest year with published data) there were 2156 mesothelioma deaths. Simply adding an equivalent number of asbestos-related lung cancers brings the total to 4312, though clearly such a figure implies much more accuracy than is truly the case. For example, it is arguable that perhaps 100 mesotheliomas each year are not caused by asbestos. Furthermore, if the number of asbestos related lung cancer deaths was indeed less than the number of mesotheliomas this would imply a lower figure still - perhaps lower than 4000. On the other hand, it is likely that a relatively small number of other cancer cases - including some stomach and laryngeal cancers - each year are caused by asbestos and so including an estimate for these would tend to increase the overall number. Given these uncertainties we suggest "around 4000" is the best available simple formulation for the current annual total number of asbestos-related cancer deaths.

How many asbestos-related lung cancer deaths are there each year?
  • Lung cancer deaths caused by asbestos are clinically indistinguishable from those caused by other agents such as tobacco smoke. This means the number of cases cannot be determined by direct counting and must therefore be estimated.
  • Because of improving evidence, our "best estimate" of the annual number of asbestos-related lung cancers has been revised over the years from "about two lung cancer deaths per mesothelioma each year" before the early 1990s to "one or two" and then to "around one" more recently.
  • In the past our estimates have largely been based on comparisons of numbers of mesothelioma deaths in studies of groups of asbestos-exposed individuals with numbers of ‘excess’ lung cancers in those groups (how many more lung cancers were observed than would have been expected in the groups if there had been no asbestos exposure). Estimates produced on this basis have always been regarded as uncertain (and still are).
  • Recent research estimated the ratio of asbestos-related lung cancer deaths to mesotheliomas by developing a statistical model for lung cancer mortality within the British working population in terms of asbestos exposure and smoking habit. This suggests a ratio in the range 0.7 to 1 - in other words rather fewer lung cancers than mesotheliomas. However, in view of the uncertainties in the totality of the epidemiological evidence "around one asbestos-related lung cancer per mesothelioma" is still a reasonable view.
  • Asbestos is a more potent cause of mesothelioma than lung cancer and smoking is thought to interact with asbestos exposure in the causation of lung cancer. Thus going forward in time the ratio of lung cancers to mesotheliomas is likely to fall, because the mesotheliomas will increasingly be generated by low exposure levels of asbestos that are less likely to cause lung cancer and because smoking levels have fallen since the 1960s (factors that, together, mean fewer lung cancers per mesothelioma).
How many mesothelioma deaths are there each year?
  • The annual number of mesothelioma deaths has increased considerably over the period for which statistics are available, reaching 2156 deaths in 2007, the latest year for which data are available, compared with 153 in 1968.
  • The expected number of deaths amongst males is predicted to increase to a peak of 2038 (90% prediction interval: 1929 to 2156) in the year 2016.
What diseases are caused by asbestos exposure?

As asbestos fibres accumulate in the lungs, several diseases may occur:

Two principal kinds of cancer:

  • Mesothelioma is a cancer of the pleural and peritoneal lining and is considered to be almost exclusively related to exposure to asbestos. It is almost always fatal with those affected usually dying within 1 or 2 years of diagnosis. Mesothelioma has a long latency period (i.e. the time between initial exposure and the onset of the disease) that is typically between 30 and 40 years.
  • Lung Cancer is a malignant tumour of the bronchi - the tubes carrying air to and from the lungs. The tumour grows through surrounding tissue, invading and often obstructing air passages. Again, the disease has a long latency period - typically at least 20 years.

Non-malignant lung diseases:

  • Asbestosis is a scarring of the lung tissue. This scarring impairs the elasticity of the lung, restricting their expansion and hampering their ability to exchange gases. This leads to inadequate oxygen intake to the blood. It is a slowly progressive disease with a latency period of 15 to 30 years.
  • Diffuse pleural thickening is a non-malignant disease in which the lining of the lung (pleura) becomes scarred. If it is extensive then it, too, can restrict expansion of the lungs and lead to breathlessness. It normally takes at least 10 years after the first exposure to develop asbestos related pleural disease. The disease is a chronic condition with no cure.
  • Small areas of scarring are called pleural plaques. They do not cause symptoms.
Who is currently at risk of being exposed to asbestos?

If disturbed, asbestos material may release asbestos fibres which can be inhaled into the lungs. Some kinds of asbestos fibres can remain there for a long time as they are not easily destroyed or degraded. Asbestos material that would crumble easily if handled, or that has been sawed, scraped, or sanded into a powder, is more likely to create a health hazard. Persons most likely to be currently exposed to asbestos are those working in building and maintenance trades, and to a lesser extent those involved in asbestos removal (where risks potentially exist unless rigorous precautions are taken.)

Why was asbestos used so extensively if it is such a hazard?

The asbestos minerals ability to resist high temperatures is what made it so useful. Asbestos is ideal for any process involving the conservation or preservation of heat. The fibre gives protection against fire, corrosion, cold, acids, alkalis, electricity, noise, energy loss, vibration, salt water, frost, dust and vermin. For a long time the dangers of asbestos use were not widely understood. Asbestos related disease generally takes many years - often several decades - to develop after exposure. Thus, the scale of the health risks were only becoming known after asbestos had already been widely used and many people had already been exposed.

Why is it a problem?

Although asbestos is a hazardous material it can only pose a risk to health if the asbestos fibres become airborne and are then inhaled. Therefore, most asbestos materials pose little risk unless they are disturbed in some way that allows the fibres to be released into the air. Inhalation of asbestos fibres can lead to serious diseases such as lung cancer, mesothelioma (a cancer of the linings of the lungs - the pleura, or lower digestive tract - the peritoneum) and asbestosis (a chronic fibrosis of the lungs). Many cases of these diseases occurring now are a result of exposure in industries that used asbestos extensively in the past. However, the fact that asbestos was also installed in many buildings means that a wider range of people still have the potential to be exposed - particularly building and maintenance workers. For this reason the Control of Asbestos Regulations 2006 brought together three previous sets of Regulations covering the prohibition of asbestos, the control of asbestos at work and asbestos licensing together with a ‘duty to manage asbestos’ for those responsible for non-domestic premises

What is asbestos?

Asbestos is the generic term for a wide range of naturally occurring minerals that crystallise to form long thin fibres and fibre bundles. Most common is the serpentine group, which includes chrysotile (white asbestos) and which has been the most frequently mined. A second asbestos group known as the amphiboles includes crocidolite (blue asbestos) and amosite (brown asbestos). The fibres have high tensile strength, and chemical, electrical and heat resistance - properties that made asbestos extremely useful as a building/insulation material. Asbestos has been used extensively in Great Britain and throughout the world.

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