The 50 Most Dangerous Jobs for Asbestos Exposure:

A Comprehensive Occupational Risk Guide

Asbestos was once used in thousands of products because it resisted heat, fire, and corrosion. Workers in construction, shipbuilding, manufacturing, mining, transportation, and military service often encountered asbestos as part of routine job duties, long before its health risks were widely understood.

This guide examines 50 jobs that have historically had the highest potential for occupational asbestos exposure. Using information from government agencies, peer-reviewed research, and public health organizations, it explains how exposure occurred in each trade and where risks may still exist today. From aging ships and factories to older schools and commercial buildings, many asbestos-containing materials remain in place, posing an ongoing occupational exposure concern for some workers.

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Occupational Asbestos Risk Index: Sources and Disclaimer

Asbestos Risks in Shipyard, Marine Engineering, and Naval Occupations

Asbestos Risks in Building Construction, Finishing, and Demolition Trades

Asbestos Risks in Industrial Manufacturing, Refining, and Power Plant Operations

Asbestos Risks in Transportation, Automotive Maintenance, and Friction Mechanics

Asbestos Risks in Mineral Extraction, Milling, and Raw Material Processing

Asbestos Risks in Public Service, Infrastructure Maintenance, and Specialty Utilities

What to Do If You’ve Been Exposed to Asbestos During Your Career

Occupational Asbestos Risk Index: Sources and Disclaimer

This occupational risk index was developed using public health materials from the Occupational Safety and Health Administration (OSHA), the Environmental Protection Agency (EPA), the National Institute for Occupational Safety and Health (NIOSH), the Centers for Disease Control and Prevention (CDC), the Agency for Toxic Substances and Disease Registry (ATSDR), the National Cancer Institute, peer-reviewed studies, and federal regulatory records. Rankings reflect historical exposure potential, frequency of contact with asbestos-containing materials, intensity of airborne dust, confined-space conditions, and whether workers handled asbestos directly or worked near others who did.

The list is not exhaustive. Many trades not included here have involved asbestos exposure, especially in older buildings, industrial facilities, ships, vehicles, and public infrastructure. A higher ranking does not mean lower-ranked jobs were safe. OSHA recognizes asbestos as a serious health hazard, and public health agencies have long warned that asbestos exposure can contribute to mesothelioma, lung cancer, asbestosis, and other diseases.

Asbestos Risks in Shipyard, Marine Engineering, and Naval Occupations

Ships relied on asbestos to insulate boilers, steam pipes, engines, bulkheads, and electrical systems. During construction and repair, workers operated inside enclosed hulls where poor ventilation allowed asbestos fibers to accumulate. Even trades that never handled insulation directly often worked in the same confined spaces, making bystander exposure common.

According to ATSDR, shipyard workers are disproportionately represented among people diagnosed with pleural mesothelioma because of the widespread use of asbestos across nearly every stage of ship construction and repair.

1. Shipwrights and Hull Builders

Shipwrights and hull builders worked throughout nearly every stage of vessel construction, particularly between 1940 and 1975, when asbestos use was most widespread. Spray-applied insulation, bulkhead panels, and fireproof wall systems released fibers as workers cut, drilled, and fitted materials inside enclosed hulls where dust accumulated quickly. According to ATSDR, shipyard workers are disproportionately represented among people diagnosed with pleural mesothelioma because of the widespread use of asbestos across nearly every stage of ship construction and repair.

2. Marine Pipefitters

Marine pipefitters regularly installed and repaired high-pressure steam systems aboard ships, where asbestos insulation helped control extreme temperatures. Many workers cut insulation blankets to size, wrapped them around pipes, and secured them with wire before trimming excess material. These tasks generated fine dust that circulated through engine rooms and mechanical spaces, especially during maintenance projects when aging insulation had become brittle and easily disturbed. According to ATSDR, shipyard workers are disproportionately represented among people diagnosed with pleural mesothelioma because of the widespread use of asbestos across nearly every stage of ship construction and repair.

3. Marine Boilermakers

Marine boilermakers installed and removed asbestos firebricks, refractory muds, thermal blocks, and boiler insulation. Repair work often required breaking apart deteriorating materials in confined spaces, where poor ventilation allowed airborne fibers to accumulate.

4. U.S. Navy and Marine Machinists' Mates

Machinists’ mates maintained engines, pumps, valves, and auxiliary equipment containing asbestos gaskets, packing, and insulation. Scraping worn gaskets, repacking valves, rebuilding pumps, and replacing insulation repeatedly disturbed asbestos throughout a vessel’s service life.

5. Marine Insulation Installers

Marine insulation installers handled loose asbestos insulation, pipe coverings, and insulating cements used on boilers, turbines, ducts, and steam lines. Cutting and fitting these materials by hand released fibers throughout mechanical spaces.

6. Ship Scrappers and Demolition Laborers

After the 1960s, ship scrappers dismantled vessels built during the height of asbestos use. Removing insulation, boilers, piping, and wall systems disturbed aging, friable asbestos. Many of these projects took place before modern containment practices and respiratory protection became standard, leaving workers exposed during nearly every phase of demolition.

Asbestos Risks in Building Construction, Finishing, and Demolition Trades

Construction represented the largest workforce exposed to asbestos. Insulation, flooring, roofing, cement products, and mechanical systems commonly contained asbestos, making exposure possible across nearly every trade. Workers also carried asbestos dust home on their clothing and tools, creating secondary exposure risks for family members. Legacy materials continue to pose hazards during renovation and demolition.

7. Asbestos Insulators

Few construction trades handled asbestos more directly than mechanical insulators. Workers routinely mixed raw asbestos cement on-site before applying it to commercial HVAC systems, boilers, and steam pipes. Pipe coverings were cut by hand, wrapped around mechanical systems, and sealed into place, releasing fibers throughout enclosed mechanical rooms and utility spaces.

8. Drywall Tapers and Installers

From roughly 1955 through 1978, many joint compounds contained asbestos to improve durability and fire resistance. Drywall finishers mixed these products, applied multiple coats, and sanded dried surfaces smooth before painting. Sanding created fine airborne dust that often spread well beyond the immediate work area, exposing nearby trades working on the same project.

9. Commercial Plumbers and Pipefitters

Commercial plumbers and pipefitters cut, beveled, and joined asbestos-cement (transite) pipe while repairing heating systems insulated with asbestos. Routine maintenance frequently disturbed aging insulation surrounding commercial piping.

10. Electricians

Electricians encountered asbestos in many parts of older buildings, even when electrical work was the primary focus of a project. Pulling wire through asbestos-cement conduits, replacing thermal backing boards in electrical panels, or working above ceilings and in attics often disturbed insulation, releasing airborne fibers into confined workspaces.

11. Bricklayers and Refractory Masons

Bricklayers and refractory masons installed and repaired asbestos mortar, refractory linings, and insulation inside industrial furnaces, kilns, and commercial fireplaces. Mixing and replacing these materials generated significant airborne dust.

12. Carpenters

Carpenters regularly cut, drill, and shape asbestos-containing building materials without necessarily realizing they contain hazardous fibers. Transite siding, fire-rated doors, ceiling tiles, and wall panels were all common on commercial projects. Even when another trade installed asbestos products, carpenters frequently worked nearby, making bystander exposure a persistent concern.

13. Roofers and Siding Applicators

Roofers and siding installers cut asbestos-cement shingles and applied roofing products containing chrysotile asbestos. Repairing weathered roofing materials often disturbed fibers that had deteriorated over decades of exposure.

14. Floor Covering Installers

Installing or removing vinyl asbestos tile exposed workers to dust generated by cutting flooring and mechanical scraping of old adhesive. The EPA continues to identify legacy flooring materials as a potential source of exposure during renovation.

15. Plasterers and Stucco Workers

Before asbestos use declined, loose fibers were sometimes mixed directly into textured, acoustic, and fire-resistant plasters to improve strength and insulation. Preparing these mixtures on-site and sanding finished surfaces exposed plasterers to airborne fibers throughout the application process.

16. HVAC Technicians

Modern HVAC technicians may still encounter asbestos while servicing older buildings. Ductwork wrapped with deteriorating asbestos tape, paper insulation around air-handling equipment, and aging mechanical systems can release fibers during repairs or replacement projects if proper precautions are not taken.

17. Demolition Contractors and Laborers

Demolition crews frequently encounter multiple asbestos-containing materials within the same structure. Tearing out walls, ceilings, flooring, insulation, and mechanical systems can release high concentrations of airborne fibers unless properly contained.

18. Cement Masons and Transite Pipe Layers

Municipal water and sewer systems across the United States once relied heavily on asbestos-cement pipe. Field installation required workers to cut, bevel, fit, and join pipe sections before burying them underground. Repairing aging infrastructure today can create similar exposure risks when older transite pipe is disturbed.

19. Painters and Decorators

Preparing older buildings for repainting often meant sanding textured walls and ceilings that contained asbestos. Before 1978, some decorative texturizers also incorporated raw asbestos fibers to improve durability and fire resistance. Surface preparation frequently produced more airborne dust than the painting itself.

20. Insulation Blowers

Insulation blowing equipment distributed loose-fill insulation into walls and attics, sometimes using vermiculite contaminated with amphibole asbestos. Operating this equipment filled enclosed spaces with airborne particles, while cleanup and maintenance exposed workers to additional dust after installation was complete.

Asbestos Risks in Industrial Manufacturing, Refining, and Power Plant Operations

Factories, refineries, and power plants historically depended on asbestos to control heat, prevent fires, and insulate equipment operating under extreme temperatures and pressure. Boilers, turbines, piping systems, furnaces, and chemical processing equipment often contained asbestos materials that required regular maintenance throughout their service life. While many industrial uses have been eliminated, chrysotile asbestos remained in limited commercial use until the EPA’s 2024 TSCA rule began phasing out remaining uses, including asbestos diaphragms used in chlor-alkali production.

21. Chemical Plant Operators

Chemical plant operators maintained pumps, valves, gaskets, and chlor-alkali production equipment that historically relied on chrysotile asbestos diaphragms. Routine maintenance repeatedly disturbed these materials until federal regulations phased out their use.

22. Petroleum Refinery Workers

Petroleum refineries contained miles of insulated piping carrying high-temperature petroleum products through distillation columns, catalytic crackers, and processing units. Routine shutdowns for maintenance required workers to remove and replace asbestos insulation, repair valves, and service equipment operating under extreme heat, creating opportunities for fiber release.

23. Stationary Engineers and Boiler Operators

Stationary engineers maintained commercial boilers by replacing gaskets, repairing refractory linings, and servicing insulated steam systems. These routine maintenance tasks regularly disturbed asbestos-containing materials.

24. Power Plant Operators

Power plants relied on asbestos throughout turbine halls, generator rooms, boiler systems, and electrical switchgear because of its insulating properties. Operators and maintenance personnel frequently worked near equipment wrapped in aging insulation while servicing high-voltage systems and replacing mechanical components that contained asbestos gaskets or packing materials.

25. Foundry Workers and Iron Molders

Foundry workers handled molding materials, asbestos blankets, and heat-resistant protective equipment while working around molten metal. Dust generated during casting and maintenance increased the potential for asbestos exposure.

26. Blast Furnace Operators and Steel Mill Workers

Blast furnaces operated at temperatures that demanded extensive thermal protection for both equipment and workers. Insulation-lined furnaces, piping, and processing equipment, while some workers historically wore protective clothing woven with asbestos fibers to shield against radiant heat. Maintenance work inside furnace systems often disturbs deteriorating insulation.

27. Textile Mill Workers

Some textile mills processed raw asbestos fibers into fire-resistant fabrics used in protective clothing, insulation, industrial blankets, and theater curtains. Spinning and weaving asbestos generated continuous airborne dust throughout production.

28. Paper Mill Workers

Commercial paper production relied on large drying systems capable of operating at high temperatures. Some mills used asbestos drying felts because they resisted heat and wear during continuous production. Replacing these heavy felts and maintaining the surrounding equipment exposed workers to asbestos fibers released during removal and installation.

29. Glass Manufacturing Workers

Glass manufacturing relied on asbestos insulation boards, protective gloves, and specialized handling tools capable of withstanding the high temperatures of molten glass. Furnace repairs and insulation replacement disturbed these materials during maintenance.

30. Kiln Operators

Kiln operators packed, lined, repaired, and removed asbestos refractory blocks inside industrial firing chambers. Routine maintenance generated significant dust within enclosed work areas.

Asbestos Risks in Transportation, Automotive Maintenance, and Friction Mechanics

For decades, asbestos was a common ingredient in brakes, clutches, and other friction materials because it could withstand repeated heat and wear. As these parts aged, normal use gradually ground the material into fine dust that collected inside brake drums, clutch housings, and surrounding components. Routine repairs often released these particles into the air, particularly before safer cleaning methods replaced practices such as compressed-air blasting to remove accumulated dust.

31. Automotive Brake Repair Mechanics

Brake repair ranked among the most common sources of occupational asbestos exposure in automotive shops. Mechanics routinely used compressed air to blow brake dust from drums before replacing worn components, sending fine particles into the surrounding workspace. Grinding or “arcing” replacement brake shoes to improve their fit created another source of airborne chrysotile dust, particularly before these practices were widely recognized as hazardous.

32. Clutch Repair Mechanics

Clutch assemblies in many passenger vehicles, trucks, and commercial equipment contained asbestos friction materials for decades. Removing worn clutch facings released dust that had accumulated through years of normal operation, while installing replacement components often disturbed additional asbestos fibers inside the clutch housing.

33. Railroad Car Repairers and Shop Mechanics

Railroad repair shops routinely overhauled passenger and freight cars insulated with sprayed asbestos for heat and sound control. Repairs often disturbed deteriorating insulation hidden behind interior panels.

34. Locomotive Engineers and Firemen

Older steam locomotives depended on asbestos insulation to contain the intense heat generated by their boilers, while many diesel locomotives also incorporated asbestos in engine compartments and cab structures. Engineers and firemen spent long hours working around these materials, particularly during inspections, maintenance, and equipment repairs involving aging insulation panels.

35. Aircraft Maintenance Technicians

Aircraft maintenance technicians serviced asbestos-containing brake assemblies, engine firewall insulation, electrical fire barriers, and other heat-resistant components during inspections and overhauls.

36. Heavy Diesel Mechanics

Heavy diesel mechanics replaced industrial brake blocks, serviced heavy transmissions, and repaired trucks, buses, and construction equipment where years of friction had generated asbestos dust.

Asbestos Risks in Mineral Extraction, Milling, and Raw Material Processing

Mining and mineral processing exposed workers to asbestos before it was used in insulation, brakes, cement, or other commercial products. Unlike many occupations on this list, these workers handled raw mineral deposits directly, often generating dense dust during blasting, drilling, crushing, and milling operations. Some extracted commercial asbestos, while others encountered naturally occurring amphibole fibers found alongside minerals such as vermiculite and talc. Before modern dust controls became standard, these environments produced some of the highest occupational asbestos exposures documented in industrial settings.

37. Asbestos Miners

38. Vermiculite Miners and Millers

Not all vermiculite deposits contained asbestos, but some of the most well-known mining operations were contaminated with amphibole fibers that occurred naturally alongside the ore. Mining, crushing, expanding, and milling contaminated vermiculite released hazardous dust throughout extraction and processing, exposing workers long before the material reached commercial markets.

39. Talc Miners and Processing Workers

Talc and asbestos can occur within the same geological deposits, posing a risk of contamination during mining and processing. Workers extracting or refining talc sometimes disturbed naturally occurring asbestos fibers mixed with the ore. This historical exposure pathway remains a regulatory focus and a topic of public health research, particularly in connection with asbestos-contaminated talcum powder.

40. Raw Asbestos Crushing and Milling Operators

Crushing and milling operators mechanically processed, sorted, and packaged raw asbestos fibers before shipment to manufacturers. Much of this work occurred before enclosed equipment and modern dust-control systems became standard

41. Asbestos-Cement Mixing Operators

Manufacturing asbestos-cement products required workers to pour bags of raw chrysotile fibers directly into large mixing hoppers with cement and water. Opening bags, transferring dry fibers, and loading mixing equipment created concentrated dust before the material became incorporated into commercial building products such as pipe, siding, and roofing materials.

Asbestos Risks in Public Service, Infrastructure Maintenance, and Specialty Utilities

Although asbestos manufacturing has largely ended in the United States, many public buildings, utility systems, and industrial facilities still contain legacy asbestos materials. Utility crews, maintenance personnel, inspectors, and emergency responders continue to encounter these products while repairing aging infrastructure, responding to disasters, or maintaining older equipment. Unlike earlier occupations on this list, exposure today often occurs unexpectedly during emergency repairs or when deteriorating materials are disturbed after decades in service.

42. Firefighters and First Responders

Structural fires, building collapses, and disaster response can release asbestos fibers from older insulation, ceiling materials, flooring, and wall systems. During overhaul operations, firefighters often remain on scene after visible smoke has cleared, increasing the risk of inhaling airborne dust released from damaged building materials. NIOSH has identified elevated mesothelioma rates among firefighters, highlighting the long-term risks of repeated exposure during emergency response.

43. Commercial/School Custodians and Maintenance Workers

Routine building maintenance often brought custodians into contact with aging asbestos-containing materials. Buffing older vinyl asbestos tile floors, repairing damaged pipe insulation, replacing ceiling materials, or performing minor renovations could disturb fibers hidden within schools, offices, hospitals, and other public buildings constructed before asbestos use declined.

44. Municipal Water Treatment Operators

Many municipal water systems still include asbestos-cement, or transite, pipe installed decades ago. Water treatment and utility workers may encounter these materials while repairing water mains, installing emergency patches, or mechanically cutting aging pipe sections during infrastructure upgrades and emergency repairs.

45. Electrical Power Line Workers

Electrical utility workers maintaining older infrastructure sometimes encountered asbestos in underground cable systems, substation equipment, and protective electrical enclosures. Splicing aging cables wrapped with asbestos shielding or servicing transite enclosures could disturb materials that had remained in service for many years.

46. Steam Tunnel Maintenance Technicians

Universities, hospitals, and municipalities often operate underground steam tunnels that contain aging insulated piping. Maintenance technicians working inside these confined spaces may encounter deteriorating pipe wrap, damaged insulation, and poor ventilation, increasing the potential for airborne asbestos fibers to accumulate during repair work.

47. Boiler Inspectors

Inspecting aging boiler systems often requires entering confined spaces to examine deteriorating refractory linings and insulation. Even without performing repairs, inspectors could encounter airborne asbestos released from damaged materials.

48. Appliance Repair Technicians

Repair technicians servicing older stoves, dryers, furnaces, and other appliances sometimes encountered asbestos heat shields and insulation while replacing internal components.

49. Oilfield Brake Block Manufacturers

Heavy-duty drilling equipment relied on specialized friction materials capable of withstanding substantial heat and mechanical stress. Manufacturing these brake blocks involved machining, molding, and finishing asbestos-containing products, followed by distribution to the oil and gas industry. This use was specifically addressed in the EPA’s 2024 TSCA risk management rule, which targeted remaining commercial applications of chrysotile asbestos.

50. Industrial Laboratory Technicians

Laboratories historically used asbestos-containing equipment because of its heat-resistant properties. Technicians handled wire gauze mats, heat-resistant gloves, autoclave insulation, and other laboratory supplies that incorporated asbestos before safer alternatives became widely available. Although these exposures were often incidental, they occurred repeatedly in research and industrial testing environments.

What to Do If You’ve Been Exposed to Asbestos During Your Career

Learning that your occupation involved asbestos exposure can be unsettling, but exposure alone does not mean you will develop an asbestos-related illness. If you believe you’ve been exposed, consider taking a few practical steps:

Monitor your health: Pay attention to persistent respiratory symptoms such as shortness of breath, a lingering cough, or chest pain, and discuss any concerns with your healthcare provider.
Tell your doctor about your work history: Many asbestos-related diseases develop decades after exposure, so sharing your occupational history can help your medical team evaluate potential risks.
Gather employment records: Job titles, dates of employment, military service records, union information, and other documentation may help establish where and when exposure occurred.
Learn about your legal options: People diagnosed with mesothelioma or other asbestos-related diseases may be eligible for financial compensation through lawsuits, asbestos trust funds, veterans’ benefits, or other programs. Speaking with an attorney who handles asbestos claims can help you understand the options, if any, available to you based on your circumstances.