Coffee Roaster Diacetyl Exposure Lawsuit

Coffee roaster diacetyl exposure refers to workplace inhalation of airborne diacetyl, 2,3-pentanedione, and related alpha diketones released during coffee roasting, grinding, flavoring, packaging, or other coffee production work.

Diacetyl is a naturally occurring chemical that can form in small amounts during coffee roasting, but it may also be present in larger concentrations when flavoring manufacturers add buttery or other flavors to food products.

The concern is not drinking coffee.

The concern is repeated workplace exposure to airborne diacetyl or other compounds that workers may inhale on a daily basis in a coffee production facility, especially in roasting rooms, grinding areas, packaging lines, storage bins, or other areas where roasted coffee and ground coffee release vapors into the air.

Coffee roaster diacetyl exposure has been linked to flavorings related lung disease, including popcorn lung and bronchiolitis obliterans.

These conditions can cause serious lung damage, reduced lung function, and, in severe cases, the need for oxygen support or a lung transplant.

Diacetyl and 2,3-Pentanedione in Coffee Processing

Diacetyl and 2,3-pentanedione are volatile chemical compounds that can be produced naturally during coffee roasting.

Diacetyl occurs naturally in many foods, including coffee beans, butter, dairy products, wine, and other food products.

In coffee processing, these substances can be released from roasted coffee beans during roasting, grinding coffee, flavoring, packaging, and storage.

2,3-pentanedione is chemically similar to diacetyl and has been studied as a related workplace inhalation hazard.

These compounds are sometimes discussed together because both have been linked to respiratory health risks in occupational settings.

Coffee workers may encounter diacetyl and 2,3-pentanedione from:

• Roasting coffee beans;
• Grinding roasted coffee;
• Packaging whole bean or ground coffee;
• Opening or working near storage bins;
• Handling flavored coffee products;
• Mixing liquid or powdered flavoring chemicals;
• Cleaning roasters, grinders, hoppers, or packaging machines;
• Working near concentrated emissions in enclosed production areas.

The coffee roasting industry has received increased attention because diacetyl and 2,3-pentanedione can be produced naturally during roasting, even in unflavored coffee.

Added flavors may create additional exposure concerns in facilities that manufacture flavored coffee.

How Roasting, Grinding, Flavoring, and Packaging Can Release Airborne Chemicals

Roasting coffee beans changes the beans chemically and physically.

During roasting, heat can form volatile organic compounds, including diacetyl, 2,3-pentanedione, carbon monoxide, carbon dioxide, and other airborne substances.

After coffee beans are roasted, they can continue to release gases and vapors.

Grinding coffee can release compounds trapped inside the roasted coffee, and packaging can concentrate those emissions near workers’ breathing zones.

Flavoring operations may create higher risk when employees handle liquid flavoring chemicals, pour flavoring into drums, or work near flavoring equipment without adequate controls.

Airborne chemical exposure may occur when workers:

• Open roasters after a batch is complete;
• Work near cooling trays or bins;
• Grind roasted coffee in enclosed grinding areas;
• Package ground or whole bean coffee;
• Work near bagging machines;
• Add or mix flavoring chemicals;
• Enter rooms where vapors collect;
• Clean production equipment after roasting or flavoring.

These chemicals may be present in low concentrations in some workplaces, but high levels can occur depending on production volume, ventilation, equipment design, product type, and the location of workers in relation to emission sources.

Why NIOSH Investigated Coffee Roasting Facilities

NIOSH investigated coffee roasting and packaging facilities after detecting airborne diacetyl and 2,3-pentanedione exposures among workers, including in facilities that did not produce flavored coffee.

Coffee became a focus because diacetyl can form naturally inside coffee beans during roasting through the Maillard reaction, which occurs when sugars and amino acids react at temperatures above 200°C.

Diacetyl production may increase with darker roasts, but roasted coffee beans meant for consumption are not considered a risk to consumers.

The concern is occupational inhalation: workers may repeatedly breathe concentrated emissions during roasting, grinding, packaging, flavoring, or storage-bin work.

NIOSH evaluations found exposure patterns that led to recommendations for ventilation improvements, air monitoring, medical surveillance, and respiratory protection.

Unflavored Coffee Can Still Produce Diacetyl

Many people associate diacetyl exposure with added flavorings, but unflavored coffee can also release diacetyl and 2,3-pentanedione during normal production activities.

Research cited by NIOSH has found that these compounds are naturally produced during the coffee roasting process and released into the air during roasting, grinding, packaging, and storage operations.

Grinding roasted coffee beans can further increase airborne emissions by creating additional surface area for gases and volatile compounds to escape.

NIOSH investigations and exposure studies have identified measurable levels of diacetyl and 2,3-pentanedione in facilities that handled unflavored coffee, demonstrating that flavoring additives are not the only potential source of worker exposure.

For that reason, occupational health concerns in coffee facilities often focus on inhalation exposure during production rather than whether a coffee product contains added flavors.

Coffee workers may face diacetyl exposure when they work near roasting, grinding, flavoring, packaging, or storage operations.

The risk is especially important for employees who spend long shifts in production areas where airborne diacetyl or 2,3-pentanedione may collect.

Workers in flavored coffee production may face higher exposure when flavoring chemicals are heated, poured, sprayed, mixed, or handled in large concentrations.

Workers in unflavored coffee facilities may also face exposure because diacetyl can be a natural by product of roasting coffee beans.

Coffee workers who may face exposure include:

• Coffee roasters;
• Grinder operators;
• Packaging employees;
• Flavoring workers;
• Production line workers;
• Quality control employees;
• Warehouse workers near roasted coffee storage bins;
• Maintenance workers who clean or repair equipment;
• Supervisors who spend time in production areas;
• Employees in small coffee roasters with limited ventilation.

The National Institute for Occupational Safety and Health has studied exposures in coffee facilities because workers may inhale diacetyl, 2,3-pentanedione, and other alpha diketones during normal production work.

Roasting, Grinding, Flavoring, and Packaging Jobs

Different coffee production jobs can create different exposure patterns.

A coffee roaster may breathe emissions from hot beans, cooling trays, and roasting equipment.

A grinder operator may be exposed when roasted coffee is broken down and volatile compounds are released into the air.

A packaging employee may work near bagging machines, storage bins, or ground coffee that continues to release vapors.

Flavoring jobs may create additional exposure because employees may work directly with flavoring chemicals supplied by manufacturers.

These products may contain diacetyl, 2,3-pentanedione, or other substances used to create flavors in food products.

Jobs with possible diacetyl exposure include:

• Roasting coffee beans;
• Grinding roasted coffee;
• Packaging unflavored coffee;
• Packaging flavored coffee;
• Working near storage bins;
• Adding liquid flavors to roasted coffee;
• Cleaning flavoring equipment;
• Handling concentrated flavoring chemicals;
• Working near bagging and sealing machines;
• Repairing grinders, roasters, or ventilation systems.

These jobs may place workers at higher risk when production areas lack adequate ventilation, local exhaust controls, air monitoring, respiratory protection, or medical surveillance.

Small Coffee Roasters and Poorly Ventilated Workspaces

Small coffee roasters may face unique risks because production often occurs in compact workspaces.

Roasting, grinding, packaging, storage, and retail operations may all happen in the same building, allowing airborne diacetyl and other compounds to move from production areas into other parts of the workplace.

Poorly ventilated workspaces can allow dangerous fumes to build up.

This risk may be higher when workers roast coffee for long periods, grind large batches, store roasted beans in bins, or package coffee in enclosed rooms.

A workplace may raise safety concerns when:

• Roasters and grinders are not properly vented;
• Workers smell strong fumes throughout the day;
• Grinding areas are enclosed or crowded;
• Storage bins release gases near workers;
• Flavoring is done without local exhaust ventilation;
• Employees are not trained about inhalation hazards;
• Air sampling is never performed;
• Respirators are not provided when needed;
• Workers develop coughing, wheezing, or shortness of breath.

Reports by the Milwaukee Journal Sentinel helped draw public attention to possible diacetyl exposure in coffee roasting workplaces, including concerns that workers in some small roasting operations could be exposed to levels above recommended limits.

Since then, occupational health researchers and agencies have continued evaluating exposures in coffee facilities.

Health risks from coffee roaster diacetyl exposure center on inhalation.

Diacetyl may be safe in small amounts in many foods when consumed, but inhaled exposure at work can affect the lungs differently.

Workers exposed to airborne diacetyl, 2,3-pentanedione, or related compounds may develop respiratory symptoms or serious lung disease.

The main concern is flavorings related lung disease, including obliterative bronchiolitis, also known as bronchiolitis obliterans or popcorn lung.

Health risks may include:

• Persistent dry cough
• Shortness of breath
• Wheezing
• Chest tightness
• Reduced lung function
• Chronic breathing problems
• Occupational lung disease
• Irreversible lung disease
• Popcorn lung
• Severe lung damage
• Respiratory disability

These conditions may be difficult to diagnose because symptoms can look like asthma, bronchitis, COPD, or other lung disease.

Workers should tell their doctors if they were exposed to coffee roasting emissions, ground coffee dust, flavoring chemicals, or airborne diacetyl at work.

Popcorn Lung, Bronchiolitis Obliterans, and Lung Damage

Popcorn lung is the common name for bronchiolitis obliterans, also called obliterative bronchiolitis.

This disease damages the small airways in the lungs, causing scar tissue to narrow or block the bronchioles.

The disease became widely associated with microwave popcorn workers after employees in popcorn factories developed severe lung disease from inhaling butter-flavoring chemicals.

Coffee workers may face related concerns because diacetyl and 2,3-pentanedione can also be present in coffee roasting and flavoring operations.

Bronchiolitis obliterans can be an irreversible lung disease.

Once scar tissue forms in the small airways, treatment may help manage symptoms, but it may not restore normal lung function.

In severe cases, workers may experience major breathing limits, oxygen dependence, respiratory failure, or lung transplant evaluation.

Shortness of Breath, Coughing, Wheezing, and Chest Tightness

Coffee workers exposed to airborne diacetyl may first notice symptoms that feel like ordinary respiratory irritation.

These symptoms may become more noticeable during physical work, climbing stairs, lifting, walking through the workplace, or completing long production shifts.

Common symptoms linked to popcorn lung and flavorings related lung disease include shortness of breath, dry cough, coughing, wheezing, and chest tightness.

Some workers may also notice fatigue, reduced stamina, or difficulty recovering after exertion.

Symptoms may be more concerning when they:

• Persist after leaving work;
• Worsen over weeks, months, or years;
• Do not improve with standard asthma treatment;
• Occur with measurable declines in lung function;
• Develop after daily exposure to roasting, grinding, flavoring, or packaging areas;
• Affect the ability to work, exercise, or complete normal activities.

Coffee workers should not assume breathing symptoms are normal.

Persistent shortness of breath, coughing, wheezing, or chest tightness after workplace exposure should be evaluated by a medical professional.

Coffee roaster lung disease can be difficult to diagnose because its symptoms overlap with asthma, COPD, chronic bronchitis, allergies, and other respiratory conditions.

A doctor may need to review the worker’s symptoms, medical history, job duties, exposure history, and test results.

A diagnosis may involve a pulmonologist, occupational medicine doctor, or other respiratory specialist.

The worker should explain whether they worked around roasted coffee, ground coffee, storage bins, flavoring chemicals, grinders, roasters, packaging lines, carbon monoxide, or other airborne substances.

Doctors may evaluate whether the worker has:

• Obstructive lung disease;
• Reduced lung function;
• Small-airway disease;
• Bronchiolitis obliterans;
• Flavorings related lung disease;
• Work-related asthma;
• Another occupational lung disease.

Because these conditions can be misdiagnosed, detailed work history is important.

A worker’s exposure to diacetyl, 2,3-pentanedione, or other compounds may help doctors determine what tests are needed.

Pulmonary Function Tests, CT Scans, and Exposure History

Pulmonary function tests measure how well the lungs move air.

These tests can show reduced lung function, airflow obstruction, or other abnormalities consistent with small-airway disease.

A CT scan may help doctors evaluate lung damage that is not visible on a standard chest X-ray.

In some cases, doctors may consider additional testing, specialist review, or biopsy if the diagnosis remains unclear.

Exposure history is a major part of the evaluation.

Coffee workers should tell their doctors:

• Where they worked;
• How long they worked there;
• Whether they roasted coffee beans;
• Whether they worked in grinding areas;
• Whether they handled flavored coffee;
• Whether they worked near storage bins;
• Whether ventilation or respiratory protection was used;
• Whether coworkers had similar symptoms;
• Whether air monitoring was ever performed;
• Whether they were exposed to diacetyl, 2,3-pentanedione, carbon monoxide, dust, fumes, or other substances.

Medical records and exposure history can also become important evidence if the worker later pursues a coffee roaster diacetyl exposure lawsuit.

Coffee roasters may be able to file a diacetyl exposure lawsuit if they were diagnosed with popcorn lung, bronchiolitis obliterans, flavorings related lung disease, or another serious lung disease after workplace exposure.

These lawsuits often involve allegations that companies failed to warn workers, reduce exposure, monitor airborne chemicals, provide adequate ventilation, or use proper safety controls.

A claim may involve occupational exposure in a coffee production facility, flavored coffee plant, roasting facility, grinding area, or packaging workplace.

Depending on the facts, potential defendants may include manufacturers, flavoring manufacturers, suppliers, facility operators, equipment companies, or other parties connected to the exposure.

A viable claim may depend on:

• A confirmed diagnosis;
• Symptoms consistent with occupational lung disease;
• Evidence of exposure to diacetyl or 2,3-pentanedione;
• Work in coffee roasting, grinding, flavoring, or packaging;
• Medical records showing lung damage;
• Evidence that the employer or another company knew or should have been aware of the risk;
• Proof that safety controls, warnings, monitoring, or ventilation were inadequate.

Not every coffee worker with breathing symptoms has a lawsuit.

These cases are fact-specific and require review of medical and workplace evidence.

Evidence That May Support a Coffee Roaster Diacetyl Claim

Evidence is critical in coffee roaster diacetyl claims because symptoms alone may not prove what caused a worker’s lung disease.

Medical records, employment history, product records, and workplace evidence can help connect exposure to diacetyl or related compounds.

Important evidence may include:

• Employment records;
• Job descriptions;
• Work schedules;
• Facility layout records;
• Safety data sheets;
• Flavoring product labels;
• Coffee production records;
• Air monitoring results;
• Ventilation records;
• Respirator policies;
• Training materials;
• OSHA or NIOSH reports;
• Coworker statements;
• Pulmonary function tests;
• CT scan results;
• Pulmonology records;
• Lung transplant evaluations;
• Records showing exposure to diacetyl or 2,3-pentanedione.

Workers should also write down what tasks they performed, which areas they worked in, whether they handled unflavored coffee or flavored coffee, whether they smelled strong fumes, and whether breathing symptoms improved or worsened away from work.

Damages in Coffee Roaster Diacetyl Exposure Lawsuits

Damages in coffee roaster diacetyl exposure lawsuits may depend on the severity of the worker’s lung disease, the strength of the exposure evidence, and the impact on daily life.

A worker with permanent lung damage may face long-term medical care, work limitations, and reduced quality of life.

Potential damages may include compensation for:

• Medical bills;
• Pulmonary testing;
• Specialist care;
• Medications;
• Oxygen therapy;
• Lung transplant-related costs;
• Lost wages;
• Reduced earning capacity;
• Pain and suffering;
• Loss of quality of life;
• Disability;
• Future medical care;
• Wrongful death damages in fatal cases.

A diagnosis of irreversible lung disease can affect a worker’s ability to earn income, remain active, and complete ordinary tasks.

No result is guaranteed, but clear medical documentation and exposure evidence may help support a claim.

TorHoerman Law represents workers who suffered serious lung damage after alleged exposure to diacetyl, 2,3-pentanedione, and other harmful chemicals.

Coffee roaster diacetyl lawsuits may involve workers in roasting, grinding, flavoring, packaging, or other coffee production jobs who later developed popcorn lung, bronchiolitis obliterans, or flavorings related lung disease.

If you worked in a coffee roasting facility, coffee production facility, flavored coffee operation, or other coffee manufacturing setting and were diagnosed with serious lung disease, you may have legal options.

TorHoerman Law can review your diagnosis, symptoms, work history, exposure records, and available evidence to determine whether you may qualify for a claim.

Contact TorHoerman Law for a free consultation.

You can also use the chat feature on this page to find out if you may qualify for a coffee roaster diacetyl exposure lawsuit.