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Asbestos was used in many industries. Today, the mineral can still be found in building materials and products used by workers. Any worker in contact with asbestos may develop mesothelioma or another asbestos-related disease. Certain occupations are at high risk of asbestos exposure.

01. Occupational Asbestos Exposure

What Is Occupational Asbestos Exposure?

Occupational asbestos exposure occurs when workers are exposed to asbestos on the jobsite or through their work-related tasks. The World Health Organization (WHO) suggests each year, more than 125 million people worldwide are exposed to asbestos while working.

These workers are then at risk of developing asbestos-related diseases, such as mesothelioma. According to Centers for Disease Control and Prevention (CDC) data released in 2017, approximately 45,221 people died from mesothelioma between 1999 and 2015.

“In the United States, an estimated 27 million workers were exposed to [airborne] asbestos fibers between 1940 and 1979.”

Asbestos-related diseases typically have long latency periods spanning decades. This means individuals exposed while working in the past may now face adverse health effects.

Workers at some jobsites may continue to face exposure risks. Those currently exposed to asbestos on the job may not be diagnosed with a disease for several more decades.

No amount of asbestos exposure is safe and many workers may encounter asbestos on the job. However, certain occupations are historically at high risk of asbestos exposure.

02. High-Risk Occupations

High-Risk Asbestos Occupations

Several industries put workers at high risk for asbestos exposure. High-risk occupations for asbestos exposure include shipbuilding, construction, oil refining and more. At-risk occupations include workers who produced, installed or removed asbestos products. Those who performed maintenance on asbestos-containing machinery also risked exposure. First responders, such as firefighters, are also among the most at risk of asbestos exposure.

Individuals in high-risk occupations may repeatedly experience concentrated asbestos exposure at work. This puts these workers at a higher risk of developing an asbestos-related disease, such as mesothelioma.

Shipyard Workers

Shipyard workers often worked with asbestos-containing materials while building and repairing ships. Because of the risk fire poses to ships at sea, asbestos materials could be found almost anywhere on the vessels. For example, ships often had asbestos insulation, pipe coverings and valves. Due to the mineral’s wide use, shipyard workers are among the most at risk of developing mesothelioma and other asbestos diseases.

Construction Workers

The CDC notes employees in the construction industry are among those with the highest rates of asbestos exposure. An estimated 1.3 million construction workers come into contact with asbestos on the job each year. Construction workers often work inside older buildings and homes. These structures used the mineral for fire resistance and durability. Floor and ceiling tiles, joint compound, siding and plaster are all common asbestos-containing construction products.

Industrial Workers

These workers are often employed in factories and power plants, working in areas where high heat and chemical exposure are common. Workers may come into contact with asbestos while handling refractory products, gaskets and valves. Even protective clothing worn to resist high temperatures often contained asbestos. Because of the mineral’s prevalence in the workplace, many industrial workers are at risk of developing mesothelioma.

Machine Operators

Machine operators work in factories and plants and often operate heavy equipment, such as bulldozers and cranes. Workers in these jobs frequently came in contact with high-friction asbestos products, such as brake linings. As machine operators perform their daily duties, asbestos fibers may release into the air. Airborne fibers may be ingested or inhaled. This exposure can lead to mesothelioma, asbestosis and other asbestos-related diseases.


Aircraft, heavy equipment and auto mechanics come into contact with asbestos primarily while performing brake jobs. Maintenance and other tasks involving friction parts could also cause exposure. Most manufacturers have stopped producing asbestos-containing brake parts. However, mechanics may still be exposed to the mineral while working on an older vehicle. Imported automotive products may also still contain asbestos.


Firefighters are among the most likely to come in contact with asbestos fibers. Asbestos exposure among firefighters occurs when fighting fires within homes and buildings built before 1980. These structures often contain many different asbestos products. Common asbestos products include insulation, tiling and roofing materials. Studies have shown firefighters are twice as likely to develop mesothelioma compared to the general public. The increased risk is largely due to repeated exposure while responding to emergencies.

HVAC Workers

HVAC workers, boilermakers and pipefitters all sometimes work in tight spaces where asbestos was used. These workers may risk exposure from working inside public buildings, residential homes and with large boilers. Workers in this industry may be exposed to high concentrations of airborne asbestos fibers while performing maintenance work or installations. HVAC workers may also risk exposure while repairing boilers installed decades ago that used asbestos materials.

Oil Refinery Workers

Oil or petroleum refinery workers help process the fuels and oils Americans use every day. These workers often encounter asbestos inside of old electrical products, cement, protective clothing and thermal insulation. Research has shown workers in this industry typically face prolonged asbestos exposure. As a result, oil refinery workers have one of the highest mesothelioma mortality rates.

03. Medium-Risk Occupations

Medium-Risk Asbestos Occupations

Medium or moderate at-risk asbestos occupations include workers who have infrequent asbestos exposure and/or face a moderate concentration of asbestos fibers. Some occupations with a moderate risk of asbestos exposure include Merchant Mariners, metal workers and railroad workers.

Although these occupations may not work with asbestos every day, it’s important to note there is no safe level of asbestos exposure. Medium-risk individuals may still develop asbestos-related diseases later in life.

Merchant Mariners

Merchant Mariners are associated with the U.S. Navy and spend much of their time aboard ships. During World War II, many Merchant Mariners were exposed to asbestos while performing repairs and other maintenance away from port. The mineral could be found throughout the ships, especially in boiler and engine rooms due to the heat generated in those areas. Due to the high rates of asbestos exposure, one study of 3,000 Merchant Mariners discovered lung abnormalities in about 40% of those workers.

Metal Workers

Asbestos was often sprayed on metal beams for fire resistance and attached to metal materials bent, drilled and shaped by metal workers. The mineral was also found in welding rods used by welders and in the plaster that lathers sanded. Metal workers could also face exposure from asbestos in protective clothing, including inside gloves and blankets.

Railroad Workers

Asbestos was widely used throughout much of the 20th century in the railroad industry. It can be found in everything from flooring inside of train cars to brake pads, rail ties and steam engines. Railroad workers may also face exposure from naturally occurring asbestos while digging new rail lines.

04. Low-Risk Occupations

Low-Risk Asbestos Occupations

Low-risk asbestos occupations include workers with:

  • Bystander asbestos exposure
  • Minimal direct asbestos exposure
  • Exposure to low-concentration of asbestos fibers

Low-risk asbestos occupations include engineers, farmers and hairdressers. Workers in low-risk occupations may be less likely to develop asbestos-related diseases than other occupations. However, no amount of asbestos exposure is safe. These workers may still experience asbestos-related diagnoses following occupational asbestos exposure.


Engineers are employed in a variety of industries. They often don’t work directly with asbestos or asbestos-containing products. However, engineers may supervise and work closely with employees who do interact with the mineral. Oftentimes, engineers’ exposure is connected to working in the same area as employees who are handling asbestos materials. Because of this, engineers may be near dust created on the jobsite.


The farming industry has shown high rates of asbestos exposure. Asbestos affects dairy farmers, poultry farmers, agricultural equipment operators and many other farming trades. Exposure has occurred during operation and repairs of farming equipment with asbestos-containing components. Farmers also risk exposure from the deterioration and renovation of old farm buildings. Some farmers may work near naturally occurring asbestos, which could cause exposure when land is disturbed.


Hairdressers are at risk of coming into contact with asbestos fibers through prolonged and frequent use of older hair dryers. These hair dryers often contained the mineral as an insulator. Asbestos is no longer used in hair dryers today. But studies have shown older hair dryers produced before the late 1970s did release fibers into the surrounding air.

Other At-Risk Occupations
  • Aerospace workers
  • Assemblers and fabricators
  • Building inspectors
  • Cooks and bakers
  • Contractors
  • Excavators
  • Flooring installers
  • Glass factory workers
  • Job and die setters
  • Longshoremen
  • Machinists
  • Maintenance workers
  • Mixing machine operators
  • Painters
  • Road workers
  • Rubber workers
  • Sawmill workers
  • Technicians
  • Tile installers
  • Tinsmiths
  • Toll collectors
  • Warehouse workers
  • Weavers
05. Asbestos Regulations

Federal Asbestos Regulations to Protect Workers

To protect the workforce, there are federal regulations in place to manage asbestos exposure on the job.

The Occupational Safety and Health Administration (OSHA) first regulated workplace asbestos exposure in the 1970s. Today, OSHA has strict guidelines on the acceptable amount of airborne asbestos fibers at a jobsite. OSHA guidelines also require labeling of all asbestos on jobsites and that workers receive proper personal protective equipment.

The occupations listed above are only a few of the many types of workers at risk of developing asbestos-related diseases. OSHA reports stress there is no safe level of occupational asbestos exposure. Those who believe they’ve experienced asbestos exposure at work should seek medical attention and file a complaint with OSHA.

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