Asbestos Exposure

An estimated 1.3 million employees in construction and general industry face significant asbestos exposure on the job. Heaviest exposures occur in the construction industry, particularly during the removal of asbestos during renovation or demolition. Employees are also likely to be exposed during the manufacture of asbestos products (such as textiles, friction products, insulation, and other building materials) and during automotive brake and clutch repair work.

What happens when we breathe?

When we take a deep breath, the air goes down the wind-pipe (or trachea) into the middle of the chest. There the trachea divides into two, then four, then eight - and finally, hundreds of thousands of little airways (or bronchi and bronchioles) in each lung. At the end of each airway is a tiny sac (or alveolus.) Healthy lungs have hundreds of millions of these sacs (or alveoli.)

What happens when asbestos is in the air we breathe?

Asbestos fibers enter the body in the air we breathe. Most of the asbestos fibers we breathe - like other dust particles - are stopped long before they enter the small airways of the lungs. For example, when we enter a dusty room or sprinkle powder, we sometimes choke. We literally cough up the mucus that contains most of the irritating substances. However, because asbestos fibers are so small and thin, many of them pass all the way down to the small airways and alveoli (or air sacs.)

ASBESTOS - Asbestos Exposure

Exposure to asbestos usually occurs by breathing contaminated air in workplaces that make or use asbestos. Asbestos is also found in the air of buildings containing asbestos that are being torn down or renovated. Asbestos exposure can cause serious lung problems and cancer. This substance has been found in at least 83 of the 1,585 National Priorities List sites identified by the Environmental Protection Agency (EPA).

What happens to asbestos when it enters the environment?

Asbestos fibers can enter the air or water from the breakdown of natural deposits and manufactured asbestos products. Asbestos fibers do not evaporate into air or dissolve in water. Small diameter fibers and particles may remain suspended in the air for a long time and be carried long distances by wind or water before settling down. Larger diameter fibers and particles tend to settle more quickly.

Asbestos fibers are not able to move through soil. Asbestos fibers are generally not broken down to other compounds and will remain virtually unchanged over long periods.

How might I be exposed to asbestos?

We are all exposed to low levels of asbestos in the air we breathe. These levels range from 0.00001 to 0.0001 fibers per milliliter of air and generally are highest in cities and industrial areas.

People working in industries that make or use asbestos products or who are involved in asbestos mining may be exposed to high levels of asbestos. People living near these industries may also be exposed to high levels of asbestos in air.

Asbestos fibers may be released into the air by the disturbance of asbestos-containing material during product use, demolition work, building or home maintenance, repair, and remodeling. In general, exposure may occur only when the asbestos-containing material is disturbed in some way to release particles and fibers into the air.

Drinking water may contain asbestos from natural sources or from asbestos-containing cement pipes.

How can families reduce the risk of exposure to asbestos?

Materials containing asbestos that are not disturbed or deteriorated do not, in general, pose a health risk and can be left alone. If you suspect that you may be exposed to asbestos in your home, contact your state or local health department or the regional offices of EPA to find out how to test your home and how to locate a company that is trained to remove or contain the fibers.

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