Can a Musty Smell in Office Really Make People Sick?

Yes, a musty smell in office spaces can be connected to health complaints, but the smell is usually a clue rather than the only cause. People may feel sick because the office has damp materials, mold growth, poor airflow, dust buildup, or other indoor air quality problems.

A musty smell often means something has been wet for too long. That “something” could be carpet, ceiling tiles, drywall, furniture, insulation, air ducts, or an area near the AC system. When moisture stays trapped, it can support mold growth and other microbial activity.

Not everyone reacts the same way. Some employees may sit in the same room all day and feel nothing unusual. Others may develop symptoms after a few hours. The CDC notes that exposure to damp and moldy environments may cause symptoms such as stuffy nose, sore throat, coughing, wheezing, burning eyes, or skin rash in some people. People with asthma or mold allergies may react more strongly.

So, are people “really getting sick” from the smell? Sometimes, yes. But it is more accurate to say they may be reacting to the indoor condition behind the smell. The odor is the warning signal. The moisture, contamination, poor ventilation, or mold growth is the issue that needs attention.

What Makes a Musty Smell Appear in an Office?

A musty smell appears when moisture, organic material, and poor airflow create the right conditions for odor to build up. Offices are especially vulnerable because many areas are closed, air-conditioned, carpeted, and filled with materials that can absorb moisture.

Mold growth

Mold is one of the most common reasons for a persistent musty office smell. Mold grows when moisture sits on building materials or surfaces long enough. It can grow behind walls, above ceiling tiles, under carpets, inside cabinets, near windows, or around HVAC components.

You may not always see mold. In some offices, the first sign is a damp, earthy, stale odor. If the smell gets stronger after the AC turns on, after rain, or in one specific room, hidden mold or damp building materials may be involved.

The EPA explains that moisture control is the key to mold control. Mold cannot be properly managed if the moisture source is ignored.

Leaks from roofs, pipes, or windows

Water leaks are another major cause. A small leak above a ceiling tile, behind drywall, or near a window frame can create a musty odor before obvious damage appears.

Common signs include:

• Brown or yellow ceiling stains
• Bubbling paint
• Soft drywall
• Damp carpet edges
• A smell that gets worse after rain
• Repeated odor in the same corner or room

Even if the surface looks dry, moisture may still be trapped inside the material.

Dirty or damp carpets

Office carpets can hold moisture, dust, spills, food particles, and cleaning residue. If carpets are cleaned but not dried properly, they may smell musty within a day or two. High humidity can make the odor worse.

Carpet near entrances, pantry areas, washrooms, and windows is usually more vulnerable because it is exposed to moisture more often.

HVAC and ventilation problems

Air conditioning and ventilation systems can spread odors through the office. The problem may come from dirty filters, condensation, blocked drainage, dusty ducts, or mold near air supply vents.

OSHA describes indoor air quality as a workplace issue that can involve humidity, poor ventilation, mold from water damage, and pollutants inside or outside the building. Good indoor air quality depends on comfortable humidity, enough fresh outdoor air, and proper control of pollutants.

If the smell is strongest when the AC starts, near vents, or in rooms with weak airflow, the HVAC system should be checked.

Poor humidity control

Humidity makes musty smells stronger. Offices in humid climates, sealed buildings, or poorly ventilated rooms can develop stale odors even without a major leak.

High humidity allows moisture to settle into fabric, paper, wood, and porous building materials. Over time, those materials can smell old, damp, and unpleasant.

Old furniture, stored paper, and clutter

Musty smells can also come from old office furniture, cardboard boxes, stored files, fabric partitions, and cluttered storage rooms. These materials absorb moisture and odor easily.

This is why storage rooms, archives, and rarely used meeting rooms often smell worse than open work areas.

When Should Employees Take the Musty Smell Seriously?

Employees should take the smell seriously when it is persistent, localized, getting worse, or linked with symptoms. A faint odor after cleaning may not mean there is a major problem. But a repeated musty smell should not be ignored.

Be more cautious if you notice:

• The smell returns every day
• The odor is stronger near vents, carpets, ceilings, or walls
• People in the same area report similar symptoms
• Symptoms improve when employees leave the office
• There are visible stains, damp patches, or mold spots
• The smell gets worse after rain or AC use
• Employees with asthma or allergies feel worse at work

Damp buildings have been linked with respiratory symptoms and disease among occupants in offices, schools, and other nonindustrial buildings. NIOSH also notes that finding and correcting sources of dampness is more effective at preventing health problems than relying only on indoor mold air samples.

That last point matters. Many workplaces jump straight to “mold testing,” but testing alone does not fix the problem. If there is water damage, damp carpet, or visible mold, the source still needs to be corrected.

What Should Employees Do to Stay Safe?

Employees should respond calmly and practically. The goal is not to panic or accuse anyone. The goal is to report the issue clearly, reduce personal exposure, and help the workplace identify the source.

First, report the smell to your manager, HR, facility team, or building maintenance. Be specific. Mention where the smell is strongest, when it happens, and whether it gets worse after rain, AC use, cleaning, or weekends.

Second, document what you notice. You can write down:

• Date and time
• Location of the smell
• Visible stains or damp areas
• Photos of water damage or mold-like spots
• Symptoms that happen at work
• Whether symptoms improve after leaving the office

This helps the employer see patterns instead of treating the complaint as a one-time odor issue.

Third, avoid touching or disturbing suspected mold. Do not scrape it, wipe it dry, spray perfume on it, or place fans directly toward it. Disturbing moldy material can release more particles into the air.

Fourth, protect yourself if you are sensitive. If you have asthma, allergies, immune problems, or recurring breathing symptoms, speak with a healthcare professional. You can also ask your employer whether you can temporarily move to another desk or work area while the issue is being investigated.

Fifth, do not rely on air fresheners. Perfume sprays, diffusers, and scented candles may hide the odor, but they do not solve dampness, mold, or ventilation problems. In some cases, strong fragrances may irritate sensitive employees even more.

What Should Employers Do About a Musty Office Smell?

Employers should treat a persistent musty smell as a building condition that needs investigation. Even if the cause turns out to be minor, ignoring it can affect comfort, trust, productivity, and employee health.

The first step is to inspect the source of moisture. Check roof areas, plumbing lines, AC drain pans, ceiling voids, carpet edges, windows, washrooms, pantry areas, and storage rooms. A musty smell rarely disappears permanently unless the moisture source is corrected.

The second step is to fix water intrusion quickly. Leaks, condensation, and damp materials should not be left for weeks. Wet ceiling tiles, carpets, drywall, and insulation may need drying, cleaning, or replacement depending on the level of damage.

The third step is to inspect the HVAC system. Filters, ducts, coils, drain pans, and ventilation rates may need attention. If the HVAC system is contaminated or spreading odor, normal office cleaning will not solve the problem.

The fourth step is to clean or remove affected materials safely. Non-porous surfaces may be cleaned if the contamination is small and manageable. Porous materials such as ceiling tiles, carpet padding, insulation, and damaged drywall may need replacement if they are moldy or water-damaged.

The fifth step is to communicate with employees. Silence often makes the situation worse. Employers should explain what was found, what action is being taken, and whether temporary relocation is needed for affected staff.

Finally, employers should improve prevention. This can include humidity control, better ventilation, regular AC maintenance, leak inspections, faster response to water damage, and proper drying after carpet cleaning.

OSHA recognizes indoor air quality as important for worker comfort and health, and its workplace guidance includes issues such as moisture damage, ventilation, and mold-related problems.

The Bottom Line

A musty smell in office areas should not be brushed off as “just a bad odor.” It can be a sign of damp materials, poor ventilation, HVAC problems, leaks, or mold growth. Some people may feel fine, but others may experience irritation, allergy-like symptoms, coughing, wheezing, or asthma flare-ups.

Employees should report the smell, document what they notice, avoid disturbing suspected mold, and take symptoms seriously. Employers should investigate the moisture source, fix leaks, check HVAC systems, clean or remove affected materials properly, and communicate clearly with staff.

The smell is not the real problem. It is the clue. The safest response is to find out what is causing it and fix that condition before it becomes a bigger workplace issue.