How to Improve Air Quality in the Basement in 6 Ways

July 31, 2023

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A dank, musty basement is no one's idea of a pleasant space. But with a little effort, you can transform your basement into an inviting area free of mold, mildew, and bad odors. 

So, how to improve air quality in basement? You can do a few things, such as install air filtration devices, control moisture, and air duct cleaning.

Improving your basement's air quality provides health benefits for your family and prevents damage to your home. Follow these six tips to freshen the air in your below-ground space.

1. Identify and Seal Air Leaks

Drafts from outdoors carry pollen, dust, and other allergens and pollutants into your home. Search your basement walls and floor for gaps and cracks that allow air to flow in from the ground around your foundation. Seal these openings with caulk designed for masonry or concrete. Expanding spray foam works well for sealing larger gaps, cracks in sill plates, and penetrations where utilities and pipes enter the basement.

Make sure to seal any open sump pumps too. Consider having a professional conduct a blower door test to identify less noticeable air leaks in need of sealing. Stopping air infiltration will make a huge difference in improving your indoor air quality.

Focus on sealing air leaks around basement windows, doors, pipes, wiring, and the sill plate where the foundation meets the framing. Apply silicone or polyurethane caulk for small cracks. For larger gaps up to 1 inch, use expanding foam sealant formulated for windows and doors. Prioritize air sealing the Rim Joist area between floors where conditioned air can be lost. Take time to thoroughly seal the basement and prevent outdoor contaminants from polluting indoor air.

2. Ventilate with Fresh Air

While sealing air leaks is crucial, some fresh air circulation is still needed in your basement. Ensure your basement has proper ventilation to dilute and remove indoor air pollutants.

If your basement lacks windows that open, install vent fans in the wall or ceiling that can push out stale air. Set the fans on timers or humidity sensors to regularly vent out moisture and odors. Opening a window upstairs while running a basement fan can create cross ventilation to flush fresh air through the whole house.

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3. Control Moisture

Excess moisture breeds mold, mildew, and mites that pollute indoor air. To control basement dampness, repair any leaks, improve rainwater drainage, and prevent groundwater intrusion. Install a dehumidifier to maintain basement humidity around 50 percent.

Make sure your clothes dryer vents outdoors, and avoid storing large amounts of damp items. Periodically disinfect and clean wet areas to inhibit mold growth. Maintaining proper moisture levels minimizes musty odors.

Moisture control should start outside the home. Grade soil and slope walkways to drain water away from the foundation. Extend downspouts at least 5 feet from the home. Seal any exterior cracks or openings for pipes and wires. Interior moisture control requires fixing plumbing leaks and improving airflow near water sources. Run exhaust fans during showering or cooking and when using humidifiers. Monitor basement humidity and condensation. A hygrometer is useful for tracking moisture levels.

4. Filter Basement Air

Like the rest of your home, your basement needs air filtration to catch airborne particles. Standalone air purifiers work well for filtering and circulating basement air. Look for units with HEPA filters designed to remove tiny particles, pollen, dust, pet dander, and more.

Portable air cleaners with activated carbon filters help eliminate odors and chemicals too. Place air purifiers where they can filter the most basement air. You may need more than one unit for larger basements.

When selecting an air purifier for the basement, look for a CADR rating of at least 300 for efficient particulate removal. Units with pre-filters extend the life of the HEPA filter. Choose a purifier sized appropriately for the basement's square footage. Position the unit away from walls and ductwork to maximize air circulation. Let the air purifier run continuously to maintain filtered air. Replace filters per the manufacturer's recommendations about every 6-12 months. Proper use of air purifiers traps pollutants and greatly improves indoor air quality.

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5. Control Pollution Sources

Prevent pollution sources located in your basement from contaminating your indoor air. Use exhaust fans or hoods when running equipment like furnaces, water heaters, and workbenches to vent emissions outside.

Store paints, chemicals, cleaners, and other hazardous products in airtight containers to prevent off-gassing. Discard moldy boxes and other unnecessary items that harbor allergens and odors. Keep your basement clean and free of clutter to minimize air pollution sources.

Avoid activities in the basement that generate particles, fumes, or odors, such as painting, staining wood, or using harsh cleaners. Only run fuel-burning appliances as needed and ensure they are properly vented. Store gasoline, paint thinner, pesticides, and other chemical products outside the home.

Regular vacuuming, wet mopping, and dusting keep the basement air free of lingering allergens and pollutant residues. Maintaining proper organization and storage habits in your basement can significantly reduce indoor air contamination.

6. Consider Radon Mitigation

Radon, an invisible radioactive gas, can enter homes through cracks and openings in basement foundations and floors. Long-term radon exposure increases lung cancer risk. Have a qualified radon tester measure your basement's radon levels. If results are high, install a radon mitigation system.

Radon mitigation uses a fan and vent pipe to draw radon from below the foundation and vent it above the roof, where it dissipates harmlessly. Reducing radon is an important step for improving basement air quality and protecting your family's health.

When installing a radon mitigation system, the vent pipe should run vertically through the basement floor slab and be exhausted outside above the eave line. The pipe joints and penetrations should be fully sealed. Choose a quiet, high-efficiency radon fan rated for continuous operation. Have a qualified radon mitigator design and install the system to effectively reduce radon levels according to EPA guidelines.

After installation, retest your basement's radon levels to confirm they have reached safe, acceptable levels below 4 pCi/L. Maintain the radon mitigation system with periodic fan checks and filter changes. Radon mitigation provides essential protection against radioactive contaminants in basement air.

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Breathe Easier with a Fresh Basement

Freshening the air in your basement takes some diligence but is worth the effort. Sealing air leaks, managing moisture, ventilating, filtering the air, controlling pollution sources, and addressing radon are key steps to improving basement air quality.

With a few upgrades and new habits, your basement can transform from a stale, smelly space to a pleasant environment for recreation and storage. So plug those air leaks, fire up the dehumidifier, and enjoy breathing the fresh air in your improved basement.

About 24/7 AC Repair Conroe

Are you looking for HVAC technicians that are honest, hardworking, and reputable? You've found them at 24/7 AC Repair Conroe. Our company has been in business for decades. We are fully licensed and insured, and SEER certified. Call us today at (281) 595-1808 to schedule an appointment. We offer 24-hour emergency HVAC repair.


How do I purify the air in my basement?

Basement air can be purified by using a dehumidifier to control moisture and humidity levels. Operating an air purifier with a HEPA filter in the basement will remove allergens, dust, and particles. Increase ventilation by running exhaust fans to force out stale air while opening upstairs windows to draw fresh air through the home. Sealing cracks and gaps in the basement walls and floor will prevent outdoor pollutants from infiltrating into indoor air.

Do air purifiers work in basements?

Air purifiers can work very well in damp, moldy basements to improve air quality. Look for purifiers with HEPA filters that remove tiny particles and activated carbon filters to absorb odors and chemicals. Place the air purifier centrally in the basement to maximize circulation. Air purifiers help control stuffiness, allergens, and musty odors common in basement spaces that lack ventilation.

Why is it hard to breathe in my basement?

Basements can be hard to breathe in due to excess moisture, promoting mold growth and musty odors. Limited air circulation and ventilation allow allergens, chemicals, and radon gas to become concentrated. Cracks and openings in the basement walls and floor allow outdoor pollutants to infiltrate the indoor air. Clutter and storage items can accumulate dust and harbor allergens like mold spores and pet dander, worsening air quality and breathability.

Does air purifier help with mold in basement?

Air purifiers can help reduce mold spores in basement air using HEPA filters to capture the tiny particles. However, air purifiers don't eliminate the source of moisture, allowing the mold to grow in the first place. Fix any water leaks, improve drainage, use a dehumidifier to control humidity, and clean up any existing mold. An air purifier should be used along with these steps to attack a basement mold problem from both sides - reducing moisture and filtering spores.

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