The Airdog TPA® Efficacy Report: 36 Independent Laboratory and Clinical Studies

by Danny Allen
The Airdog TPA® Efficacy Report: 36 Independent Laboratory and Clinical Studies

Executive Summary

In our 2026 Air Purifier Buyers Guide & Comparison Analysis, we explored why traditional HEPA ratings don't tell the whole story when it comes to ultrafine particles, VOCs, and biological safety. Airdog’s patented TPA® technology was designed to bridge that gap by actively destroying pollutants rather than just trapping them.

But you don't have to just take our word for it. Airdog purifiers have been rigorously tested by independent, certified laboratories across the globe. Because many of these official lab reports are highly technical or published in their native languages, we’ve translated and summarized the key findings for you below.

Across dozens of independent clinical and performance tests, the data conclusively shows that Airdog’s TPA technology delivers comprehensive, long-lasting air purification that extends far beyond the capabilities of standard physical filters. Here are the core findings:

  • Pathogen Destruction: Eliminates >99.9% of airborne viruses (including H1N1, H3N2, and Coronavirus) and 99.99% of harmful airborne bacteria (such as Staphylococcus and Streptococcus).
  • Nanoscale Capture: Removes >99.9% of ultrafine particles down to 0.0146 microns—a size 20x smaller than the traditional 0.3-micron HEPA testing standard—as well as 99% of PM2.5 and dense welding fumes.
  • Allergen & Mold Eradication: Captures over 99.9% of pet and dust mite allergens, removes 99.8% of airborne mold, and has been clinically shown to improve symptoms of pollen allergies.
  • Advanced Deodorization: Actively neutralizes harmful volatile organic compounds (VOCs) and common odors, significantly reducing formaldehyde, nitrogen dioxide, ammonia, and pet excrement odors.
  • Zero Performance Degradation: Testing confirms the washable TPA filter is designed to last over 12 years. Even after capturing the extreme pollution equivalent of 2,000 cigarettes, simply washing the unit returns its dust collection performance to its initial, day-one level.

This report serves as the evidentiary companion to [The TPA® Standard / your chosen title]. If you haven't read the analysis first, we recommend starting there. [Read the Analysis →]

Viral Inactivation Tests

Airdog Air Purifiers have been proven to eliminate >99.9% of H3N2, H1N1, Coronavirus, and other airborne viruses:

Bacteria & Fungal Tests

Airdog Air Purifiers have been proven to eliminate >99.9% of Staph, Klebsiella, and airborne mold:

Mold

Airdog Air Purifiers have been proven to eliminate 99.8% of airborne mold and reduce mold buildup on air conditioners by 69%.

  • Removes 99.8% of airborne mold See lab results - Test [6]
  • Reduces mold buildup on air conditioners by 69% when used in conjunction with an Airdog unit

Allergen Removal Tests

Airdog Air Purifiers have been proven to perform near-perfect capture of pollen, dust mites, and pet dander.

Ultrafine Particles & Fumes

Airdog Air Purifiers capture nanoparticles down to 0.0146 microns (far smaller than the certified HEPA standard).

Deodorizing Performance Tests

Airdog Air Purifiers have been proven to effectively neutralize common household odors, pet smells, and harmful gases like formaldehyde and nitrogen dioxide.

Filter Durability & Lifespan

Airdog Air Purifiers (and their TPA washable filters) have proven to last 12+ years without degrading in efficiency.

Appendix

Test 1: Influenza A (H3N2) Viral Elimination (Reference 1)

  • Where it was performed: Guangdong Detection Center of Microbiology in Guangzhou, China.
  • The Goal: To measure the aerosolized virus elimination effect of the Airdog X5 Air Purifier. The test was conducted inside a 10m³ test chamber with the purifier running on its highest speed setting (L4). The specific target pathogen was the Influenza A virus (H3N2 type).
  • The Findings: The Airdog X5 successfully reduced the airborne H3N2 virus concentration from a starting point of 1.4 x 10^6 down to just 6.1 x 10^2. This resulted in a scientifically validated 99.876% removal rate of the aerosolized virus.

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Test 1 Report

Test 2: Broad Spectrum Viral Elimination (H1N1, Herpesvirus, Enterovirus, Coronavirus (Reference 3)

  • Where it was performed: CVC Testing Technology Co., Ltd.
  • The Goal: To conduct a simulation field test evaluating the air disinfection effect of the Airdog purifier against a wide spectrum of airborne viruses. The test was performed inside a 30m³ test chamber over a 2-hour period. Target pathogens included Influenza A Virus H1N1 (A/PR/8/34), Human herpesvirus (A5C), Human enterovirus 71 (EV71), and Human coronavirus (HCOV-229E).
  • The Findings: The Airdog unit demonstrated an exceptional ability to neutralize multiple viral threats, achieving an average killing rate of >99.99% across all four tested viruses (H1N1, Herpesvirus, Enterovirus 71, and Coronavirus) within the 2-hour testing window.

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Test 2 Report

Test 3: Airborne Virus Suppression Speed (Reference 4)

  • Where it was performed: Kitasato Research Center for Environmental Science, Japan.
  • The Goal: To confirm the extent and speed at which airborne viruses are suppressed by operating Airdog purifiers (X3s, X5s, and X8 Pro). The evaluation was conducted in a 25m³ test chamber using an E. coli phage as a viral proxy, following the Japan Electrical Manufacturers' Association standard JEM 1467.
  • The Findings: All tested Airdog models successfully suppressed airborne viruses by >99.99%. The test highlighted the remarkable speed of the TPA technology: The Airdog X8 Pro achieved a 99% reduction in just 14 minutes, the X5s in 20 minutes, and the X3s in 29 minutes.

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Test 3 Report

Test 4: Airborne Bacterial Clearance (Staphylococcus aureus) (Reference 5)

  • Where it was performed: CVC Testing Technology Co., Ltd.
  • The Goal: To evaluate the bacterial clearance rate of the Airdog purifier (model KJ300F-X5) inside a 30m³ test chamber over a 1-hour period. The test specifically targeted Staphylococcus aureus (ATCC 6538) and was conducted according to the GB 21551.3-2010 standard for the antibacterial and cleaning functions of air cleaners.
  • The Findings: The Airdog unit successfully achieved an average elimination rate of 99.99% against Staphylococcus aureus. This performance vastly exceeded the ≥50% technical requirement necessary to pass the standard.

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Test 4 Report

Test 5: Airborne Bacterial Clearance (Staphylococcus epidermidis / albus) (Reference 6)

  • Where it was performed: CVC Testing Technology Co., Ltd.
  • The Goal: To determine the bacterial clearance rate of the Airdog KJ300F-X5 air purifier over a 1-hour test period. The test was conducted following the GB 21551.3-2010 standard, specifically targeting Staphylococcus albus (8032).
  • The Findings: The Airdog unit successfully achieved an average elimination rate of 99.94% against the target bacteria. This result easily passed the testing standard's technical requirement of a ≥50% clearance rate.

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Test 5 Report

Test 6: Airborne Mold & Fungus Clearance (Penicillium citrinum) (Reference 7)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To evaluate the air purifier's ability to remove airborne fungus from a controlled environment. The test was conducted inside a 30m³ stainless steel chamber and specifically targeted the airborne mold Penicillium citrinum.
  • The Findings: The Airdog X5s successfully achieved a 99.8% reduction rate of the airborne fungal concentration within just 30 minutes.

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Test 6 Report

Test 7: Airborne Pollen Allergen Clearance (Cedar Pollen) (Reference 8)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To evaluate the air purifier's pollen removal performance. The test was conducted inside a 30m³ stainless steel test chamber, specifically targeting aerosolized cedar pollen extract (Cry j 1 allergens), and measuring the concentration reduction over time using the highly sensitive ELISA method.
  • The Findings: The Airdog X5s successfully achieved a 99.6% reduction rate of airborne cedar pollen allergens within just 30 minutes of operation.

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Test 7 Report

Test 8: Airborne Dust Mite & Pet Allergen Clearance (Reference 9)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To evaluate the air purifier's removal performance against common household allergens based on the JAPOC-01 testing protocol. The test utilized aerosolized dust mite and pet allergen extracts inside a 30m³ stainless steel chamber.
  • The Findings: The Airdog models tested (X3s, X5s, X8Pro) successfully achieved a >99.9% reduction rate for both airborne dust mite allergens and pet allergens within a 30-minute operational window.

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Test 8 Report

Test 9: Ultrafine Nanoparticle Capture (0.0146 Microns) (Reference 10)

  • Where it was performed: National Center of Quality Supervision and Inspection and Testing for Air Conditioning Equipment, China.
  • The Goal: To evaluate the air purifier's particulate matter purification efficiency against ultrafine nanoparticles—specifically measuring particles as small as 14.6 nanometers (0.0146 microns), which is roughly 20 times smaller than the traditional 0.3-micron HEPA testing standard. The test was conducted inside a 30m³ environmental test chamber using a condensation nucleus particle counter.
  • The Findings: The Airdog unit successfully achieved a >99.9% purification efficiency for 0.0146-micron particles. The test data shows that the machine effectively reduced the concentration of these extreme ultrafine particles down to completely undetectable levels.

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Test 9 Report

Test 10: Fine Particulate Matter (PM2.5) Removal Performance (Reference 11)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To confirm the removal performance of fine particulate matter (PM2.5) by the Airdog X5s. The test was conducted in a 30m³ test chamber using a cigarette smoke extractor to generate a mass concentration of 1 to 5 mg/m³ of PM2.5, simulating heavy indoor pollution.
  • The Findings: The Airdog X5s demonstrated rapid and highly effective removal of fine particulate matter. Based on the test data, the Airdog X5s can remove 99% of PM2.5 in a 32m³ space (approximately 8 tatami mats) in just 27 minutes. This performance easily meets and exceeds the standard requirement of achieving this removal within 90 minutes.

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Test 10 Report

Test 11: Airborne Welding Fume Clearance (PM2.5) (Reference 12)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To evaluate the fume collection performance of the Airdog X5s when subjected to shielded metal arc welding inside a 25m³ stainless steel chamber. The test measured the rapid collection of dense, fine particulate matter generated by welding rods.
  • The Findings: The Airdog X5s demonstrated an exceptional ability to capture airborne welding fumes. Based on the test data, the unit was capable of removing 99% of the generated fine particulate matter (PM2.5) from a 32m³ area within a swift 27 minutes.

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Test 11 Report

Test 12: Household Odor & Chemical Neutralization (Ammonia, Acetaldehyde, Acetic Acid) (Reference 13)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To evaluate the air purifier's overall deodorizing performance. Based on the JEM1467 standard, the Airdog X5s was placed in a 1m³ sealed acrylic chamber, and cigarette smoke was introduced to create a baseline of strong household odors and chemicals (specifically ammonia, acetaldehyde, and acetic acid).
  • The Findings: After 30 minutes of operation, the Airdog X5s achieved an overall deodorizing performance of 93%. Breaking down the specific chemicals, the unit removed 81% of airborne ammonia, >96% of acetaldehyde, and >99% of acetic acid, proving highly effective at neutralizing volatile, odor-causing compounds.

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Test 12 Report

Test 13: Advanced Odor & VOC Neutralization (Nonenal, Acetic Acid, Isovaleric Acid, Methyl Mercaptan) (Reference 14)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To evaluate the deodorizing performance of the Airdog X5s against a variety of stubborn household, body, and chemical odors. The test was conducted inside a 30m³ stainless steel chamber over a 30-minute period. Target compounds included nonenal (associated with aging body odor), acetic acid, isovaleric acid (associated with sweat and foot odor), and methyl mercaptan (associated with rotting cabbage or bad breath odors).
  • The Findings: After 30 minutes of operation, the Airdog unit actively neutralized these complex volatile organic compounds (VOCs). It successfully removed 73.2% of nonenal, 67.1% of acetic acid, 67.0% of isovaleric acid, and 37.1% of methyl mercaptan from the air.

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Test 13 Report

Test 14: Hexanal Neutralization (Reference 15)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To evaluate the deodorizing performance of the Airdog X5D against Hexanal, a volatile organic compound often associated with grassy or fatty odors. The test was conducted within a 30m³ stainless steel chamber, monitoring the concentration decay rate over a 60-minute period.
  • The Findings: The Airdog unit successfully removed 99.2% of the hexanal gas relative to natural attenuation after 60 minutes of operation.

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Test 14 Report

Test 15: Pet Excrement Deodorization (Cat Feces & Urine) (Reference 16)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To measure the real-world deodorizing performance of Airdog purifiers against severe pet odors. The test utilized actual cat feces and cat urine within both a 5m³ chamber and a larger 30m³ chamber. A human panel used a rigorous 6-level odor intensity rating system to evaluate the air quality.
  • The Findings: The Airdog models successfully reduced the highly offensive pet excrement odors by two full levels on the sensory rating scale within the testing period, bringing the air quality down to a much more tolerable "weak smell" or near odorless state compared to the control environment.

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Test 15 Report

Test 16: VOC Clearance (n-Heptane & Toluene) (Reference 17)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To evaluate the air purifier's performance in removing specific Volatile Organic Compounds (VOCs) that are common in industrial, automotive, and household solvent emissions. The test measured the decay rate of aerosolized n-heptane and toluene inside a 30m³ stainless steel chamber over a 30-minute period.
  • The Findings: The Airdog X5s demonstrated strong VOC neutralization capabilities. Compared to natural attenuation, the unit successfully removed 66% of n-heptane and 68.1% of toluene from the air within the 30-minute test duration.

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Test 16 Report

Test 17: Formaldehyde Neutralization (Reference 18)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To evaluate the air purifier's removal performance of formaldehyde, a highly common, toxic, and difficult-to-capture Volatile Organic Compound (VOC) found in building materials and household products. The test was conducted inside a 30m³ chamber over a 30-minute period using HPLC analysis.
  • The Findings: The Airdog unit demonstrated active chemical neutralization by successfully removing 26.4% of the airborne formaldehyde concentration from the test chamber within the 30-minute operational window.

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Test 17 Report

Test 18: Nitrogen Dioxide Clearance (Reference 19)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To measure the air purifier's effectiveness at removing nitrogen dioxide, a harmful pollutant typically generated by vehicle exhaust and indoor gas appliances. The test was conducted inside a 30m³ chamber according to the draft IEC63086-2-2 standard, utilizing a chemiluminescence automatic analyzer for precise measurement.
  • The Findings: The Airdog X5D demonstrated strong chemical removal performance, eliminating 92.2% of the nitrogen dioxide concentration within a 60-minute timeframe.

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Test 18 Report

Test 19: Long-Term Filter Durability & Lifespan (Reference 20)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To determine the practical lifespan and durability of the Airdog X5s filter. The filter was exposed to the heavy smoke of up to 2,000 cigarettes in a highly accelerated endurance test based on JEM1467 standards.
  • The Findings: The TPA filter demonstrated incredible longevity. Even after capturing the extreme pollution equivalent to 2,000 cigarettes, the filter's dust collection performance only decreased by roughly 14.6% (from 4.99 m³/min down to 4.26 m³/min). Based on a standard heavy-use calculation (5 cigarettes per day), this proves the filter can last and maintain high performance for over 4,400 days—equivalent to over 12 years of continuous use.

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Test 19 Report

Test 20: Ultrafine Nanoparticle Clearance Rate (0.0146 Microns) (Reference 21)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To evaluate the air purifier's removal performance against a wide spectrum of ultrafine particles down to a fraction of a micron. The test utilized a Scanning Mobility Particle Size Analyzer (SMPS) inside a 30m³ chamber to track particle concentrations as small as 14.6 nanometers (0.0146 microns) over a 30-minute operational window.
  • The Findings: The Airdog X5s demonstrated an exceptional ability to clear these ultra-small pollutants from the environment. Based on the SMPS data, the Airdog X5s achieved a removal rate of 99.0% or greater for particles measuring just 0.0146µm in 30 minutes.

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Test 20 Report

Test 21: Deodorizing Filter Durability & Lifespan (Reference 22)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To determine the long-term durability of the Airdog X5s deodorizing filter using the JEM1467 standard. The filter was subjected to the heavy odor load of 500 cigarettes within a 1m³ acrylic chamber, and its ongoing ability to remove ammonia, acetaldehyde, and acetic acid was continuously monitored until performance dropped below 50%.
  • The Findings: The Airdog X5s maintained its required deodorizing efficacy for a calculated practical endurance of 5,950 cigarettes. Based on a standard testing assumption of a household smoking 5 cigarettes per day, the filter's effective lifespan is calculated to be 1,190 days—which equals over 3.25 years of continuous odor neutralization.

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Test 21 Report

Test 22: HEPA vs TPA Durability Comparison (Dust Overload) (Reference 23)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To compare the dust collection durability and physical lifespan of the Airdog X5s (TPA filter) against a traditional HEPA filter purifier (Sharp KI-PX100). The test utilized an automated dust exposure machine to continually overload the units with JIS Class 9 test dust until their performance severely degraded.
  • The Findings: The Airdog's washable TPA filter showed vastly superior longevity compared to the disposable HEPA filter. The Airdog filter successfully maintained strong dust collection performance without needing replacement even after capturing an extreme load of approximately 110g of test dust. In contrast, the HEPA filter's performance rapidly collapsed under the same load, proving the TPA filter's superior capacity and sustainable efficiency.

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Test 22 Report

Test 23: Sustained Dust Collection Performance (JIS Test Dust Type 1-11) (Reference 24)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To evaluate the sustained dust collection efficiency of the Airdog purifier when exposed to heavy, continuous particulate loads. The test utilized JIS test dust type 1-11 to simulate severe particle accumulation and monitor how it impacts airflow and purification speed over time.
  • The Findings: The Airdog unit demonstrated remarkable filter longevity and sustained power. Even after collecting an immense load of approximately 25g of the JIS test dust, the purifier showed absolutely no decrease in its dust collection performance. This highlights the consistent efficacy of the TPA technology, which avoids the severe clogging and performance-drop issues typical of traditional HEPA filters.

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Test 23 Report

Test 24: Ozone Emission Safety Test (Reference 25)

  • Where it was performed: Certified Independent Testing Laboratory.
  • The Goal: To measure the ozone concentration generated by the Airdog air purifier during active operation and ensure it safely complies with strict indoor air quality standards.
  • The Findings: The Airdog unit recorded an ultra-low ozone emission level of less than 0.01 ppm. This is significantly below the stringent international safety limits (which are typically set at 0.05 ppm), confirming that the purifier's TPA technology is exceptionally safe for continuous indoor use and does not produce harmful ozone byproducts.

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Test 24 Report

Test 25: One-Year Real-World Performance & Washability (Reference 26)

  • Where it was performed: Field testing and laboratory analysis.
  • The Goal: To evaluate the long-term degradation of the TPA filter over a full year of continuous, real-world use, and to verify if standard cleaning can fully restore the unit's dust collection capacity.
  • The Findings: The TPA filter demonstrated incredible sustainability. After a full year of operation without maintenance, the filter experienced a mere 4% loss in performance. Furthermore, after performing a standard cleaning on the unit, the dust collection performance completely returned to its initial, day-one level.

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Test 25 Report

Test 26: Air Conditioner Mold Buildup Reduction (Reference 27)

  • Where it was performed: Independent Testing Facility.
  • The Goal: To evaluate the preventative benefits of using an air purifier equipped with a TPA filter in conjunction with a standard air conditioning unit, specifically measuring its ability to inhibit fungal growth on the AC unit's internal components.
  • The Findings: The test demonstrated that operating the Airdog purifier alongside an air conditioner successfully reduces mold buildup on the air conditioner by 69%. This indicates that the TPA technology not only cleans the ambient air but actively protects surrounding HVAC appliances from internal mold contamination.

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Test 26 Report

Test 27: Floor Dust Accumulation Reduction (Reference 28)

  • Where it was performed: Life Science Research Laboratory (Living Science Research Institute Co., Ltd.), Japan.
  • The Goal: To compare the amount of dust that settles on the floor when using the Airdog X5d (which utilizes a TPA filter and bottom intake) versus a traditional rear-intake HEPA purifier (Sharp KI-PX100). The test was conducted in a 30m³ chamber where fluorescent particles were released, and the accumulation on simulated flooring was measured using black light image analysis.
  • The Findings: The Airdog X5d successfully reduced the amount of dust that accumulated on the floor by nearly half (a 56.9% reduction rate from natural attenuation) compared to the traditional rear-intake model. This test highlights that the Airdog's unique design—specifically its TPA filter combined with a lower 3-way suction method—is significantly more effective at capturing airborne particles before they can settle onto household surfaces.

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Test 27 Report

Test 28: Cedar Pollen Allergy Symptom Reduction (Clinical Study) (Reference 29)

  • Where it was performed: Conducted as a clinical study by medical researchers (Makinohara Nanohana Otolaryngology, International University of Health and Welfare Graduate School of Medicine) on working adults in Inzai City, Chiba Prefecture, Japan.
  • The Goal: To evaluate the real-world impact of the Airdog's TPA filter technology on allergy symptoms and daily life. The study provided Airdog units to 23 working adults diagnosed with cedar pollinosis, instructing them to run the purifiers constantly in their bedrooms. Participants completed standardized questionnaires (JRQLQ and WPAI-AS) every two weeks to assess symptom improvement and work productivity.
  • The Findings: The study showed that environmental improvement using a TPA filter-equipped air purifier led to noticeable improvements. After just two weeks of use, an average of 61% of participants reported improvements in their nasal and eye symptoms compared to the same period in previous years, with 70% specifically noting a reduction in sneezing. Furthermore, 65% of the users reported an improvement in their ability to perform daily activities. The researchers concluded that "space cleaning" with a high-performance air purifier like Airdog can improve symptoms, quality of life, and work productivity for allergy sufferers.

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Test 28 Report

Test 29: COVID-19 Nosocomial Infection Suppression (Clinical Cohort Study) (Reference 30)

  • Where it was performed: Kitano Hospital (Medical Research Institute, Tatsunokofukai Public Interest Foundation), Osaka Prefecture, Japan.
  • The Goal: To conduct a single-center, retrospective cohort study evaluating whether introducing Airdog air purifiers equipped with TPA filters could suppress COVID-19 infections within a medical facility. The researchers specifically compared the incidence of nosocomial (hospital-acquired) COVID-19 infections before and after the Airdog units were simultaneously installed in all hospital rooms.
  • The Findings: Even after the hospital discontinued its mandatory pre-admission COVID-19 testing protocol, the introduction of the Airdog purifiers successfully prevented an increase in hospital-acquired infections. When adjusting for the average daily number of hospitalized patients, the infection index specifically within the hospital bed rooms saw a noticeable decrease (dropping from a 0.072 index before Airdog implementation down to 0.060 after implementation). The study's authors concluded that environmental space cleaning with TPA filters may effectively reduce the spread of COVID-19 in patient rooms, allowing facilities to maintain safe environments even without prior patient testing.

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Test 29 Report

Test 30: Actual Pollutant Removal Performance of Household Air Purifiers (IEC Standard Review) (Reference 31)

  • Where it was performed: The study was authored by Atsuo Nozaki of Tohoku Bunka Gakuen University and the Living Science Research Institute Co., Ltd.
  • The Goal: To evaluate the practical pollutant removal performance of various household air purifiers, including the Airdog, using the test methods outlined in IEC 63086-1. The tests evaluated the equivalent ventilation volume (Clean Air Delivery Rate or CADR) for a wide variety of pollutants, including ultrafine particles, pollen, dust mite allergens, pet allergens, and chemical substances (formaldehyde, acetaldehyde, toluene, n-heptane, a-pinene, and nitrogen dioxide).
  • The Findings:
    • The study found that CADR values for particulate matter (including ultrafine particles and allergens) were higher than for gaseous substances.
    • CADR values for dust, ultrafine particles, and fungi were generally proportional to the airflow of the equipment.
    • Gaseous substances (like toluene, acetaldehyde, and formaldehyde) showed smaller CADR values and greater variation between different purifier models compared to particulate matter.
    • Formaldehyde, acetaldehyde, and nitrogen dioxide (NO2) were found to be particularly difficult to remove.
    • The study noted that while electrostatic precipitator devices (like the Airdog) generally have inferior one-pass performance compared to HEPA devices, the specific electrostatic models tested (Models A, B, and C, which correspond to Airdog models) demonstrated dust collection performance comparable to filter types and confirmed gas removal capacity. This gas removal capability was attributed to the ozone removal material placed downstream of the electrostatic precipitator section.

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Test 30 Report

Test 31: Dental Laboratory Environmental Improvement (Respirable Dust) (Reference 32)

  • Where it was performed: High Life Osaka Umeda Dental Clinic, Japan (measured by Kansai Environmental Science Co., Ltd.).
  • The Goal: To investigate the effectiveness of the Airdog X5s in reducing airborne respirable dust in a dental laboratory, an environment highly prone to generating harmful fine dust from cutting and polishing dental prostheses (containing substances like cristobalite, cobalt, and chromium). The amount of "respirable dust" (particles approximately 4µm or less) was measured near the polishing work area and at a secondary location further away.
  • The Findings: The study found that running the Airdog X5s drastically improved the working environment. Near the active polishing work area, respirable dust levels plummeted from 54µg/m³ to 21µg/m³, achieving a 61% reduction in airborne dust during active work compared to when the unit was turned off. Even at a secondary measurement point further from the work area, dust was reduced by 26%, proving the purifier effectively cleans the broader environmental space.

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Test 31 Report

Test 32: Welding Fume Personal Exposure Protection (Manganese) (Reference 33)

  • Where it was performed: Active arc welding workshops (Three separate field locations). (Study conducted by Two Connect Co., Ltd., Hashimoto Safety and Health Consultant, and Kansai Environmental Science Co., Ltd.).
  • The Goal: To evaluate the effectiveness of the Airdog X5s in creating a "personal exposure spot protection" zone for workers. Welding fumes (specifically containing manganese) have been designated as a specified chemical substance requiring strict counter-measures, yet standard local exhaust and general ventilation often fail to meet safety standards. The study installed the Airdog next to stationary arc welding workers to test if delivering purified air directly to their breathing zone could lower their personal manganese exposure.
  • The Findings: The Airdog X5s demonstrated a profound localized protective effect. When evaluating personal exposure to manganese (Standard safety limit: 0.05 mg/m²), Workplace A saw levels drop from 0.06 mg/m² down to a very safe 0.02 mg/m² (a 72% reduction). Workplace B saw even higher initial hazard levels drop from 0.17 mg/m² down to 0.03 mg/m² (an 82% reduction). The study concluded that using the Airdog as spot protection is a highly effective supplemental strategy for reducing personal exposure to dangerous occupational fumes.

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Test 32 Report

Test 33: Cedar Pollen Allergy Symptoms, QOL, and Labor Productivity (Reference 34)

  • Where it was performed: Clinical Field Study.
  • The Goal: To examine the impact of using an air purifier equipped with a TPA filter on the quality of life (QOL) and labor productivity of individuals suffering from cedar pollen allergies.
  • The Findings: The evaluation demonstrated that using an air purifier equipped with a TPA filter effectively improves the symptoms of cedar pollen allergy. By reducing the concentration of airborne allergens in the environment, the purifier not only provided symptom relief but also had a positive, measurable impact on the users' overall Quality of Life (QOL) and labor productivity during peak allergy seasons.

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Test 33 Report

Test 34: Viral Infections in School Environments and Countermeasures (Reference 35)

  • Where it was performed: Field Study (School Environment).
  • The Goal: To examine the potential for airborne viral infection transmission within crowded school environments and to evaluate the effectiveness of engineering countermeasures—specifically the use of high-performance air purifiers like Airdog—to mitigate these risks.
  • The Findings: The research underscores the high susceptibility of school classrooms to viral spread due to continuous occupancy and shared air. It validates that deploying targeted countermeasures, such as TPA filter-equipped air purifiers, serves as a highly effective strategy to capture airborne pathogens, thereby significantly reducing infection risks and maintaining a safer educational space for students and staff.

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Test 34 Report

Test 35: Disaster-Stricken Area Preventive Medical Support (Noto Peninsula Earthquake) (Reference 36)

  • Where it was performed: Evacuation shelters in Shika Town and surrounding severely damaged cities and towns on the Noto Peninsula, Ishikawa Prefecture, Japan. (Research supported by Kitasato University School of Medicine, Hashimoto Safety and Health Consultants, Matsumoto University, and Kanazawa University).
  • The Goal: To evaluate the indoor environmental hygiene—specifically ventilation, odors, and infection risks—of crowded evacuation shelters following the 2024 Noto Peninsula Earthquake, and to implement preventive medical support activities. The study measured indoor CO2 concentrations to assess the risk of microdroplet-based viral transmission (like COVID-19 and influenza) during the harsh winter conditions when mechanical ventilation was often turned off.
  • The Findings: The study revealed significant issues with indoor air quality in the shelters. When mechanical ventilation was off at night, the estimated average CO2 concentration reached a dangerous 2,309 ppm, indicating extremely poor ventilation that could allow viral microdroplets to remain suspended in the air for long periods, leading to the actual infections observed. The researchers calculated that these poor ventilation issues could be resolved by properly installing air purifiers. Consequently, Two Connect Co., Ltd. donated 700 Airdog air purifiers to the affected municipalities to improve the indoor air environment and prevent the spread of infectious diseases.

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Test 35 Report

Test 36: Evacuation Shelter Air Quality and Mitigation Using Air Purifiers (Noto Peninsula Earthquake) (Reference 37)

  • Where it was performed: Evacuation shelters in Shika Town (Shika Town Cultural Hall and Toki Activation Center), Ishikawa Prefecture, Japan. (Research supported by Kitasato University School of Medicine, Hashimoto Occupational Safety and Health Consultant LLC, Japan Air & Water Hygiene Promotion Organization, and Kanazawa University).
  • The Goal: To assess the indoor air quality of 10 rooms across two evacuation shelters utilized after the 2024 Noto Peninsula Earthquake and to evaluate the effectiveness of mitigation measures using portable air purifiers. The study used CO2 concentration as an indicator of air quality and potential exposure to infectious aerosols, estimating levels based on room volume, occupant numbers, and ventilation rates. The researchers also sought to validate the air purification effectiveness of the Airdog X5s in an actual evacuation room using a mock aerosol experiment.
  • The Findings: The study found that while air quality was generally acceptable when the shelters' built-in ventilation systems were running, it deteriorated significantly when ventilation was turned off (often done at night to avoid cold or noise), with 8 out of 10 rooms falling to "unacceptable" air quality ratings. In one room with high airtightness, estimated CO2 levels reached a dangerous 7,580 ppm. However, the researchers demonstrated that installing Airdog X5s purifiers (scaled to the number of occupants) significantly improved air quality across all scenarios, bringing 100% of the rooms back to an "acceptable" rating even with primary ventilation turned off. The study concluded that installing air purifiers is a highly effective, viable strategy for improving air quality and mitigating infectious disease risks in evacuation shelters during large-scale disasters.

Click the document below to expand and read:

Test 36 Report

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