Formaldehyde
Formaldehyde is a specific volatile compound common indoors and classified as carcinogenic. It off-gasses from pressed-wood furniture, adhesives, insulation and some textiles — strongest when new and in warm, humid conditions. Because it matters even at low levels, it is monitored on its own rather than folded into TVOC.
A known carcinogen worth watching on its own.
Formaldehyde has health effects at concentrations where most VOCs are harmless — which is why standards single it out.
Carcinogenic
Formaldehyde is classified as a human carcinogen. Minimising exposure matters, especially in spaces occupied for long hours.
Irritation
Even short exposure can irritate the eyes, nose and throat and trigger coughing — noticeable well below the legal limit.
Sensitive settings
Hospitals, labs and schools combine emitting materials with vulnerable occupants, making dedicated monitoring valuable.
Certification
WHO, WELL, LEED and RESET Air all set formaldehyde limits. Continuous data proves you stay under them.
Stay well under the guideline limit.
The WHO sets a 30-minute guideline of 100 µg/m³. Healthy interiors aim to sit comfortably below it, with any approach to the limit prompting action.
Mostly from pressed wood and adhesives.
Formaldehyde has a narrower source list than general VOCs — and emissions rise with heat and humidity.
Pressed-wood furniture
Particleboard, MDF and plywood use formaldehyde-based resins that off-gas for months, heavily when new.
Adhesives & finishes
Glues, laminates, paints and some insulation and textiles release formaldehyde into the room.
Heat & humidity
Emissions climb in warm, humid conditions — so the same room can read higher in summer or after heating.
Combustion & smoke
Gas appliances, candles and tobacco smoke add formaldehyde directly to the air.