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Kagi Lab
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The lab measures invisible indoor air to create comfortable environments.

AboutAbout the lab
Comfortable indoor environments, starting from the air we cannot see.
The Kagi Lab studies the indoor air environment in buildings.
Targeting pollutants suspended in the air, the lab assesses current conditions by measuring what cannot be seen.
It investigates the sources of pollutants and how they behave within a space, then proposes measures that can be implemented through building design.
Improving the indoor air environment is important for occupants to live safely, healthily, and comfortably.
Key terms
- Indoor air quality
- Indoor air quality: the condition of the air inside a building, expressed by the amount of pollutants, odor, humidity, and so on
- Pollutants
- Pollutants: substances that float in the air and may negatively affect human health or comfort
- Field survey
- Field survey: a study in which researchers visit actual buildings to measure and confirm current conditions
ResearchResearch themes
Improving the indoor air environment of buildings is important for occupants to live safe, healthy, and comfortable lives. The lab combines field surveys of indoor air quality, laboratory experiments, and on-site measurements in buildings where countermeasures have been applied to develop ways to improve the environment.
Chemical Substances Hidden in Home Air
Volatile chemical substances emitted from air fresheners, sprays, and the building materials of wooden houses can cause health problems. The lab measures concentrations in houses and temporary housing, confirms emission behavior through experiments, and explores ways to improve the air.
*Illustrative imageAirborne Particles and Droplets Indoors
Using experiments and calculations, the lab studies how fine particles such as cooking smoke, dust stirred up by walking, and coughing droplets move indoors and how much people inhale, and considers ways to reduce them with air purifiers and airflow.
*Illustrative imageThermal Environment, Sleep, and Work Comfort
Heat, cold, and the way air conditioning is directed affect sleep quality and work performance. The lab measures the thermal environment and how people perceive it in bedrooms, offices, and hospitals, and studies air-conditioning control that is comfortable and supports high productivity.
MembersFaculty
The members of the Kagi Lab consist of faculty members and doctoral, master's, and undergraduate students.As of 2026
- ProfessorNaoki KagiPublications ↗
- Assistant ProfessorWataru UmishioPublications ↗
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Portable Air Quality monitor Air quality meter” Raralu4440 / CC BY-SA 4.0 (cropped)
- Airborne Particles and Droplets Indoors: “Dust dancing in the sunlight P9060755c” E.mil.mil / CC BY-SA 4.0 (cropped)
- Thermal Environment, Sleep, and Work Comfort: “Bedroom, Interior of apartment in Brisbane, 2025, 02” Chris Olszewski / CC BY-SA 4.0 (cropped)
- Related lab (Yuasa Lab): “012 Rooftop HVAC systems and roof ventilation ducts in Tokyo, Japan” Marek Ślusarczyk (Tupungato) / CC BY 3.0 (cropped)
- Related lab (Asawa Lab): “Running Through Paris Heat (153178 - vir 20240806 lrg)” NASA Earth Observatory images by Wanmei Liang and Michala Garrison / Public domain (cropped)
- Related lab (Mitsui Lab): “2512-superstructure-métallique” Thierry Caro, pour le magazine 2512. / CC BY-SA 2.5 (cropped)
- Related lab (Murata Lab): “Another daoist temple ( )” Francisco Anzola / CC BY 2.0 (cropped)
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