What Is IAQ and Why It Matters in Thailand
April 10, 2026
Indoor Air Quality (IAQ) affects your health every day. In Thailand, humidity, mold, and PM2.5 pollution make it a bigger issue than most people realise.
Most people spend over 90% of their time indoors. The quality of the air inside your home or office has a direct impact on your health, sleep, and concentration.
IAQ stands for Indoor Air Quality. It covers several key factors: PM2.5 particulate matter, CO2 levels, volatile organic compounds (VOCs), temperature, humidity, and biological contaminants like mold and bacteria.
In Thailand, the main IAQ concerns are humidity and mold. When indoor humidity stays above 60%, mold can grow on walls, ceilings, and inside AC units within weeks. Mold spores trigger allergies, asthma, and respiratory infections.
PM2.5 is another serious issue. Bangkok regularly records PM2.5 levels above the Thailand standard of 37.5 micrograms per cubic metre. Keeping windows closed helps, but you need fresh air circulation too. That is where fresh air handling units come in.
CO2 builds up quickly in sealed, air-conditioned rooms. At 1000 ppm you feel tired and find it hard to concentrate. At 1500 ppm, headaches and drowsiness set in. A fresh air system that exchanges indoor and outdoor air keeps CO2 well below these levels.
The good news is that modern IAQ systems handle all of this in one unit. Broan fresh air units, for example, bring in filtered outdoor air while expelling stale indoor air, keeping PM2.5, CO2, and humidity all within healthy ranges.
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