Best 7 Air Purifiers For Mold Spores and Mildew

What Are Mold Spores and How Do They Spread?

Mold is a type of microscopic fungus that spreads through tiny reproductive cells called mold spores. These minuscule, lightweight spores allow mold to propagate rapidly under the right conditions. Mold spores are found virtually everywhere - both indoors and outdoors. They float effortlessly through the air and can infiltrate into buildings through open windows, doors, vents, cracks, crevices and other openings.Some of the most common indoor molds include:

● Aspergillus - found in soil, plants, rotting wood● Penicillium - grows on wallpaper, carpet, fabrics● Cladosporium - thrives on wet, rotting leaves and wood● Alternaria - spotted on window frames, floors, drywall● Stachybotrys - the infamous "toxic black mold"

When mold spores land on a damp, organic material, they germinate and begin digesting and destroying whatever they are growing on through strands of mold called hyphae. As the mold colony expands, more spores are released into the air to repeat the cycle of growth and contamination.

Health Dangers Posed by Airborne Mold Spores

Inhalation of mold spores and mold byproducts can spark dangerous allergic reactions and other health issues, especially among sensitive groups like children, the elderly and those with compromised immune systems. Some potential health effects include:

● Allergic reactions - runny nose, eye irritation, coughing, wheezing● Asthma attacks and aggravation of asthma symptoms● Respiratory problems - difficulty breathing, shortness of breath● Recurrent infections due to immune suppression● Headaches, fatigue, nausea and other flu-like symptoms

Additionally, certain types of mold produce toxic substances called mycotoxins that can severely impact health by causing neurological problems, reproductive issues and liver damage when exposure occurs.

Key Factors That Promote Mold Growth

Mold needs a few key elements to rapidly take hold and colonize an area:Moisture - Mold thrives with increased water supply and high humidity levels above 55%. Plumbing leaks, flooding, rainwater intrusion and high occupant activity all elevate indoor moisture.Organic Matter - Mold utilizes materials like wood, paper, drywall, insulation and fabric to provide nutrients for development.Poor Ventilation - Stagnant, still air allows concentrations of mold spores to accumulate. Lack of fresh air circulation also increases humidity.Time - If excess moisture persists, mold will eventually germinate and establish itself on susceptible materials. The longer water/humidity issues go unchecked, the greater the mold infestation.By controlling these critical factors, the growth and spread of mold can be prevented. Air purifiers provide an effective tool to battle airborne mold spores and lower humidity for a cleaner, healthier indoor environment.

Why Air Purifiers Are Critical for Battling Mold


Air purifiers serve an invaluable role when it comes to mold prevention and maintaining healthier indoor air quality by:

Trapping Airborne Mold Spores

Air purifiers actively filter out mold spores floating in the indoor air before they have a chance to settle and colonize. True HEPA filters are extremely effective at this, able to capture over 99.97% of particles as small as 0.3 microns through a dense mesh of submicron fibers. This includes allergens like mold spores, which typically range from 2 to 10 microns in size.By constantly circulating air through a True HEPA filter, air purifiers continuously scrub the air of mold spores and other microscopic contaminants. This also reduces the overall spore count inside, decreasing allergy symptoms and health issues related to mold exposure.Some models take filtration a step further by incorporating activated carbon filters before or after the True HEPA filter. Activated carbon adsorbs volatile organic compounds (VOCs) and musty odors commonly released by mold. This helps purge the lingering "moldy smell" from the air.Advanced units also utilize UV-C light technology to irradiate airborne mold spores drawn in via the fan. The UV rays damage the DNA and reproductive capabilities of mold spores, essentially sterilizing them. Together with HEPA filtration, UV-C lights provide a powerhouse two-pronged approach to destroying airborne mold.

Lowering Humidity to Discourage Mold Growth

Excessive humidity provides the essential moisture source for mold to thrive. Many air purifiers now come equipped with smart sensors that continuously monitor both humidity and temperature levels.When indoor air becomes too humid, the air purifier automatically ramps up its fan speed to dehumidify the space by pulling that damp air through the unit and drying it out. More advanced models take this a step further by actively controlling humidity for optimal comfort through built-in humidifiers and dehumidification modes.By maintaining humidity within the ideal 30-50% range, air purifiers create an indoor environment where mold struggles to propagate due to insufficient moisture. This proactively restricts mold growth rather than just reactive air filtration of existing spores.

Generating Cleaner, Healthier Air Quality

By constantly filtering all types of airborne contaminants and regulating humidity, air purifiers create an overall cleaner, healthier indoor environment that inhibits mold growth.This safeguards occupants from the dangerous health effects of mold exposure such as:

● Asthma attacks● Allergic reactions● Recurrent Respiratory infections● Headaches/nausea● Fatigue

It also reduces pesky allergy symptoms like coughing, sneezing and irritated eyes.Air purification technology has come a long way in terms of high-efficiency filters, smart sensors, and connectivity. The newest generation of air purifiers now provide complete air quality solutions to completely remove mold from the air while restricting further development.By purchasing a quality air purifier tailored to handle mold spores, you can effectively eliminate this hazardous contaminant from your indoor air for good.

Top Features of Effective Mold-Fighting Air Purifiers


When selecting an air purifier specifically for battling mold, there are several key features and technologies to look for:

True HEPA Filtration - The First Line of Defense

A True HEPA filter is the most vital component as it physically captures 99.97% of particles as small as 0.3 microns through dense submicron fibers. This includes all mold spores, which range from 2 to 10 microns.However, not all True HEPA filters are created equal. Models with higher Clean Air Delivery Rates (CADR) for Smoke and Dust filtering excel at mold removal since mold spores fall into these categories. For the best results:

● Seek out True HEPA air purifiers with:      - Smoke & dust CADR over 300 cfm for spaces above 500 sq ft      - Replacement filters readily available      - Annual filter replacement indicators● Carefully compare the filter specs between models● Prioritize higher dust/smoke CADRs over overall room size ratings● Verify both HEPA and carbon filters are replaced regularly for peak performance

Following these guidelines ensures powerful non-stop air circulation and top-tier filtration with full support.

Activated Carbon Pre-Filtration

Many units combine a large activated carbon pre-filter with the True HEPA filter to adsorb gaseous pollutants like VOCs as well as remove musty "moldy" odors.This is critical because even after airborne mold spores are trapped by the HEPA filter, the lingering moldy scent still remains. Activated carbon has an extremely porous structure that works like a sponge to soak up these smelly VOC compounds.The carbon acts as an effective first-line of defense against airborne mold particles. Additionally, periodic replacement of exhausted carbon filters prevents degraded materials from becoming a new hot spot for mold growth.

UV-C Light Technology

UV-C light irradiation can serve as a powerful secondary filtration system in air purifiers. As spore-laden air circulates past the UV bulb inside the unit, the UV-C rays penetrate the cell structures of mold spores.This disrupts cell metabolism and permanently damages mold reproductive processes. Similar to disinfecting water, the UV exposure essentially sterilizes air passing through the purifier.However, some UV-C lights also produce ozone as a byproduct, which can cause respiratory issues at high levels. Thus, optimal models utilize specially shielded "ozone-free" UV-C lights to focus rays solely on destroying bio-contaminants.

Humidity Sensors & Controls

Since excess moisture allows mold colonies to expand rapidly, purpose-built mold air purifiers feature humidity management. Some utilize dedicated dehumidification modes to run fans at high speed until environmental moisture is under control.More advanced designs incorporate built-in humidifiers and dehumidifiers to actively inject or remove moisture automatically. This keeps relative humidity within the target 30-50% sweet spot.Smart humidity sensors enable the unit to monitor conditions and engage moisture control features accordingly to prevent excess humidity.

Smart Connectivity & Controls

Many high-end air purifiers now connect to smartphones via WiFi and manufacturer apps. This allows remote monitoring of humidity levels, VOC concentrations, air quality indexes and fan speeds.Advanced auto modes leverage built-in sensors and AI algorithms to self-calibrate for optimal set-and-forget purification. These smart self-regulating controls ensure your unit is always working proactively to eradicate existing mold while preventing further growth.By keeping these key features in mind, you can identify air purifiers engineered specifically to eliminate hazardous mold from your indoor air. Investing in the right kit provides clean, breathable air free from problematic spores and musty odors.

Best 7 air purifiers For Mold Spores and Mildew

1. PURO2XYGEN P500 - Best Overall for Mold & Mildew


The Puroxygen P500 air purifier takes the top spot as our best overall pick geared specifically for removing mold spores and preventing mildew growth.This smart WiFi-enabled unit packs a punch when it comes to purification with its medical-grade H13 HEPA filter, large coverage capacity up to 1650 square feet, and intelligent auto-mode leveraging built-in air quality sensors.

Key Features:

● True HEPA Filter captures 99.97% of particles 0.3 microns● Large 1650 sq ft coverage for spacious areas● Activated carbon pre-filter adsorbs odors● WiFi connectivity & app control● Auto-mode adjusts fan speeds as needed● Filter change indicator


The H13 HEPA filter traps mold spores while the activated carbon pre-filter purges musty mildew odors. This keeps the air fresh and mold-free. Smart sensors monitor air quality and auto-mode self-calibrates the fan to filter more aggressively during humidity spikes or detected contaminants. This responsive automation restricts mold growth conditions.Large room capacity up to 1650 sq ft allows purified air to circulate freely even in open floor plans. WiFi and app connectivity grants control and monitoring from anywhere.


The major downside is the relatively high price point given the advanced features. Replacement filters can also get costly over time. Additionally, the boxy design takes up more space aesthetically.

Why We Recommend It:

With best-in-class purification competencies specifically targeting airborne mold along with smart adaptive tech and large coverage, the Puroxygen P500 gives you elite-level defense against problematic mold and mildew. This makes it our top choice for efficient mold removal and prevention.

2. Blueair 211+ - Best for Medium Rooms


The Blueair 211+ packs robust mold-fighting performance into a compact, Swedish-designed body. Equipped with patented HEPASilent filtration technology and activated carbon pre-filter, this nimble air purifier offers efficient particle removal down to 0.1 microns along with odor elimination.

Key Features:

● Proprietary HEPASilent Filtration● Activated carbon pre-filter● Covers 540 sq ft rooms● Auto-mode available (211+ Auto model)● Low noise output● 1-button control


HEPASilent Filtration turbocharges mechanical HEPA performance through an electrostatic charge that supercharges airborne particles to boost capture rates. This allows faster air turnover for quicker purification in medium-sized spaces up to 540 square feet.The activated carbon pre-filter specifically targets mold odors and VOCs using a highly porous adsorbent structure, leaving behind fresh, odorless air. Intuitive single button control provides easy speed adjustments while maintaining an quiet fan volume under 60 dB even on the highest setting.


● Higher price point● Replacement filters can get costly● No remote control or app connectivity

Why We Recommend It:

With best-in-class patented filtration technology tailored to demolish fine mold particles and accompanying musty smells, the Blueair 211+ gives you an effective all-in-one solution for medium rooms vulnerable to mold and mildew buildup.

3. PuroAir HEPA 14 - Best for Allergies


The aptly named PuroAir HEPA 14 packs medical-grade H14 filtration into a compact body ideal for core rooms up to 1,115 square feet. As an innovative leader in air purification technology, PuroAir combines thoughtful engineering with intuitive controls including a smart auto-mode leveraging built-in sensors.

Key Features:

● Hospital-grade HEPA 14 filter● Covers 1,115 sq ft spaces● Activated carbon pre-filter● Auto-mode with smart sensors● Quiet operation● Built-in timer


The medical-grade H14 filter captures an industry-leading 99.99% of particles down to 0.1 microns, easily trapping problematic mold spores. An activated carbon pre-filter assists by adsorbing musty odors. Convenient auto-mode self-adjusts based on indoor air quality readings while maintaining quiet ~50 dB output even on higher speeds.


● Replacement filters can get pricey● No app connectivity

Why We Recommend It:

Featuring one of the most advanced filtration systems tailored to seek and destroy airborne mold, the PuroAir HEPA 14 provides elite-level protection for medium-sized rooms up to 1,100 square feet. This makes it a top performer focused on demolishing mold and allergens.

4. Levoit Core 300 - Best Budget Pick


The aptly named Levoit Core 300 packs true HEPA filtration into a compact build, removing 99.97% of airborne particles down to 0.3 microns. This workhorse features vortex air circulation to enhance airflow while maintaining quiet operation.

Key Features:

● True HEPA filter● Covers 1,095 sq ft spaces● Pre-filter and activated carbon filter● VortexAir technology for circulation● Sleep mode for quiet operation● Display light can be disabled


True HEPA filtration ensures effective removal of mold spores and other allergens. The activated carbon pre-filter assists by adsorbing musty odors indicative of mold growth. Higher airflow VortexAir technology keeps air constantly circulating through filters for enhanced purification. Sleep mode reduces fan noise for undisturbed rest.


● No humidity or air quality sensors● No app connectivity

Why We Recommend It:

For its affordable price point, the Levoit Core 300 still provides robust defense against airborne mold and other allergens. This makes it our top budget-friendly pick for taking on mold spores and mildew buildup.

5. Germ Guardian AC4825 - Best with UV-C


The Germ Guardian AC4825 packs a one-two punch featuring true HEPA filtration paired with UV-C light technology to actively combat airborne mold spores. This versatile tower circulates room air over 4 times per hour in small spaces, scrubbing away micro-contaminants.

Key Features:

● True HEPA filter● UV-C light kills mold spores● Covers 740 sq ft rooms● Activated carbon pre-filter● Low noise● 3 fan speeds


True HEPA filtration captures 99.97% of particles down to 0.1 microns such as mold spores. The UV-C light then irradiates spores passing through, disrupting their reproductive processes to prevent further growth. The activated carbon pre-filter assists by trapping larger contaminants and adsorbing musty odors.


● Replacement filters can get costly over time● No smart sensors or connectivity

Why We Recommend It:

Offering hospital-grade true HEPA filtration augmented by mold-killing UV-C bulb technology, the Germ Guardian AC4825 provides powerful protection against airborne mold spores and accompanying musty smells. This makes it a solid choice to eliminate mold concerns in medium rooms vulnerable to mold infestation.

6. Shark HP302 - Best Set & Forget


The Shark HP302 breaks the mold with its innovative NeverChange filtration, eliminating filter replacements for 5 whole years. This translates to over $300 in savings over comparable models. Beyond cutting costs, integrated CleanSense technology enables smart auto-adjustments while tackling large areas up 1,400 square feet.

Key Features:

● NeverChange HEPA filter lasts 5 years● Huge 1,400 sq ft coverage● DebrisDefense pre-filter● CleanSense IQ auto-adjusts● Odor neutralizer tech


The NeverChange HEPA filter avoids periodic replacement hassles and expenses. Large room capacity provides whole-home purification. CleanSense IQ monitors air quality, automatically optimizing fan speeds as needed to maintain cleaner air. Odor neutralizer tech specifically targets pesky mold smells.


● Higher upfront cost● Limited filter options

Why We Recommend It:

By merging durable multi-year filtration, wide room coverage and smart adaptive tech, the Shark HP302 constitutes a veritable set-it-and-forget-it powerhouse for obliterating mold concerns across your entire home.

7. Winix 5500-2 - Best Classic Option


The popular Winix 5500-2 constitutes a tried-and-true classic packing robust air cleaning into a streamlined body. This versatile workhorse features true HEPA filtration paired with washable activated carbon to capture 99.97% of particles including mold spores while eliminating musty odors.

Key Features:

● True HEPA filter● PlasmaWave technology● 360 sq ft coverage● Washable AOC carbon pre-filter● Low 27.8 dB noise● Auto-mode


Proven true HEPA filtration ensures mold spores and other microscopic allergens are trapped and removed. The washable AOC carbon pre-filter assists by adsorbing musty smells indicative of mold growth. Convenient auto-mode leverages smart sensors to self-adjust fan speeds based on detected air quality.


● Smaller room coverage● No app connectivity

Why We Recommend It:

As a decade-tested solution packing robust air scrubbing competencies augmented by odor elimination, the Winix 5500-2 provides reliable protection against airborne mold spores and accompanying musty mildew smells. This makes it a solid classic choice for managing mold concerns in small-to-medium spaces.

Proper Maintenance For Mold Prevention


To keep your air purifier working at peak performance for battling mold spores and mildew growth, follow these key maintenance tips:

Replace Filters Regularly

● Stick to manufacturer recommendations for replacing HEPA and carbon filters      - Typically every 6-12 months for HEPA      - Carbon filters may need replacement every 3-6 months● Mark your calendar with reminder alerts● Check filters during replacement for any damage, tears or breachments● Reset any filter life indicator lights/apps after inserting newly replaced filters● Consider buying backup filters for rapid swap outs● Properly dispose old filters to avoid spreading spores
Replacing clogged filters ensures maximum airflow for purification. Using filters past their prime vastly decreases effectiveness.

Clean Unit Surface & Vents Every Week

● Gently wipe down the exterior with a dry microfiber cloth● Carefully vacuum any visible debris buildup from rear intake vents and crevices● Use a damp cloth with warm water and mild detergent to scrub the facade● Rinse and dry with a lint-free cloth● For models with washable pre-filters, hand wash and air dry them
This prevents exterior mold growth and maintains unrestricted airflow through clean vents.

Position Unit Properly

● Keep unit at least 2 feet away from direct moisture sources like bathrooms, laundry rooms and kitchens● Place centrally in the room for 360° multidirectional air intake● Allow at least 6 inches of clearance on all sides for airflow● Adjust location seasonally if environmental humidity fluctuates dramatically
Strategic positioning reduces intake of excess moisture while permitting sufficient airflow.

Check Filters for Mold Growth

● Visually inspect both HEPA and carbon filters during routine replacements● Look for black spotting or slimy buildup signaling mold● If musty smells return unexpectedly, check for breachments● Replace filters immediately if any mold growth is spotted● Identify and restrict excess moisture sources contributing to growth

Catching moisture issues and mold growth early prevents recontamination of indoor air. Address root causes rather than just treating symptoms via air filtration.By rigorously sticking to these best practice maintenance guidelines, your air purifier will continually run at full capacities to actively combat mold risks. This enables you to breathe easier knowing your indoor air is clean and mold-free.

Expert Tips For Minimizing Mold


In addition to using an air purifier, implementing these proactive tips will help restrict mold growth:

Monitor Humidity Levels Carefully

● Use a digital hygrometer ($10-$50) to continuously monitor humidity● Ideal indoor humidity range is 30-50%● Run standalone dehumidifiers or air purifier dehumidification modes to actively lower moisture● Move indoor plants outdoors if possible to avoid excess watering● Ventilate kitchens/bathrooms for at least 20 minutes after cooking/bathing
Proactively tracking humidity helps quickly catch rising moisture levels that enable mold colonies to thrive.

Fix Any Water Leaks Immediately

● Act immediately upon first signs of water intrusion or flooding● Switch off water supply to prevent further flooding● Extract excess water with wet vacuums and mops● Thoroughly dry affected areas within 24-48 hours using fans● Completely repair damage, replace water-logged porous materials● Closely monitor area for several weeks for signs of mold
Rapid drying and restoration within 48 hours minimizes the excess moisture mold needs to initially colonize. Lingering dampness enables mold to take hold.

Improve Whole-Home Ventilation

● Open windows periodically for 15 minute bursts to air out individual rooms● Run bath/kitchen exhaust fans for at least 45 minutes after cooking/bathing● Consider installing whole-house ventilation systems or ERVs● Upgrade HVAC air filters to MERV-13 for cleaner circulation● Add floor/ceiling ventilation registers connected to HVAC system
Proper moisture-venting ventilation frequently circulates fresh air and controls humidity across your entire home.

Clean Existing Mold Properly

● Mix Concrobium or Benefect botanical mold cleaner per instructions● Thoroughly pre-clean surrounding areas to contain spread● Scrub affected porous surfaces using protective gear to kill mold roots● Use High-PA suction HEPA vacuums to completely extract residue● Fog mold remediation products in the air to capture spores● Install commercial-grade air scrubbers during remediation

Killing mold with non-toxic cleaners prevents regrowth and airborne spreading while air scrubbing technology captures spores released during cleaning.By proactively enacting these expert mold remediation tips immediately at the first signs of mold, you can quickly eliminate colonization risks before issues have a chance to accelerate. Air purifiers work hand-in-hand to provide a critical layered defense against mold by actively filtering spores in real-time.

Debunking Air Purifier Myths About Mold


Despite their effectiveness, several pervasive myths about using air purifiers for combatting mold issues persist. Let's unpack and debunk some of the most common misconceptions:

Myth 1: Air Purifiers Remove All Mold

FALSE - Air purifiers physically capture up to 99.97% of airborne mold spores floating around via mechanical filtration and optional UV irradiation. However, they cannot directly eliminate mold actively growing on surfaces like HVAC vents, walls, carpets and fabrics.Surface mold remediation requires adjusting indoor humidity levels, proper cleaning/killing solutions, replacing porous materials, encapsulation and potentially fogging spore neutralizers.While air purifiers actively destroy caught spores, any existing mold colonies can continue spreading new spores if left unchecked. The source requires remediation along with air filtration to provide comprehensive protection.

Myth 2: Moldy Filters Spread More Mold

FALSE - Modern true HEPA filters featuring dense packs of randomly intertwined glass fibers prevent captured mold spores and growths from escaping back out. Spores lack intake vents or exhaust ports to channel through.While filters appearing visibly dark, slimy or fuzzy due to excessive mold growth should get replaced immediately, they cannot actively disperse spores back into the purified air in use.However, safely sealing and discarding used infected filters in plastic bags is still recommended. Take great care not to unintentionally liberate large reservoirs of collected live contaminants during removal or disposal.

Myth 3: Air Purifiers Eliminate Dehumidifiers

FALSE - Air purifiers lacking dedicated internal dehumidifiers can only filter some ambient humidity from the air passing through onboard fans. They cannot actively condense gallons of water like standalone dehumidifiers equipped with chill coils and collection tanks.In damp basements prone to flooding or during seasonal humidity spikes, active mechanical dehumidification must operate alongside air purification. Internal dehumidification modes in air purifiers assist but don't negate dehumidifiers for substantial moisture issues.While air purifiers provide indispensable defense against airborne mold spores, they cannot tackle all facets of mold prevention alone. Employing them alongside properly layered moisture control, cleaning procedures and containment establishes comprehensive protection.

Frequently Asked Questions

Is there an air purifier that kills mold spores?

Yes, the Puroxygen P500 utilizes a unique ultraviolet UV-C irradiation system to actively kill mold spores drawn into the unit while also preventing reproduction. This provides an exceptional mold-demolishing solution.

What takes mold spores out of the air?

True HEPA filters physically capture 99.97% of mold spores from indoor air as it passes through dense fiber mesh. UV-C lights also damage spores to prevent spreading. Activated carbon filters adsorb musty smells.

Is a dehumidifier or air purifier better for mold?

Air purifiers filter existing spores while dehumidifiers restrict the humidity mold needs to grow. Using both provides the best protection to kill mold, limit spread and prevent regrowth by controlling moisture.

How long do mold spores stay in the air after cleaning?

Mold spores can remain buoyant for weeks after release and circulate through HVAC systems. Running HEPA air scrubbers during and after remediation protects against inhaling stirred up spores.

Will a dehumidifier stop mold from spreading?

Dehumidifiers help slow mold growth by condensing ambient moisture from 70%+ humidity down to 45-50%. However, existing colonies can still spread until physically removed. Use alongside mold killing cleaners.


When dealing with problematic mold spores and pesky mildew concerns, quality air purification provides a critical line of defense. As opposed to just masking musty odors, today’s high-performance air purifiers actively seek and destroy airborne spores while creating an indoor environment inhospitable to fungal growth.By investing in the right purification system tailored to handle mold containment based on your unique home and spacio-temporal risk factors, you can effectively eliminate this hazardous contaminant from your air for good. Consult our mold remediation tips and debunked myths to enact a comprehensive anti-mold strategy coupling moisture control, surface cleaning and air filtration.With advanced HEPA filters, UV-C lights and adaptive humidification modes , modern air purifiers constitute indispensable weapons to add to your mold-fighting arsenal while still blending discretely into your home’s existing aesthetic. So breathe deep and rest easy knowing the air you and your family intake is fresh, crisp and mold-free.

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