Do not use smell as the only test
Formaldehyde is colourless and people differ in their sensitivity to odour and irritation. A noticeable smell can prompt investigation, but the absence or strength of an odour does not measure concentration. Persistent symptoms or strong irritation require prompt medical advice and avoidance of the suspected space.
Reduce emissions at the source
Identify recently installed cabinetry, composite wood, adhesives, flooring, paint and furnishings. Ask contractors and suppliers for product information. NEA advises consumers to specify low-formaldehyde building products in renovation contracts and to discuss ventilation requirements before work begins.
Allow time and ventilation
Build adequate ventilation time into the renovation and move-in schedule. Open windows where practical and operate mechanical ventilation appropriately. Source control and outdoor air remain the first steps. A coating or air-cleaning device should not be presented as a substitute for removing a strong source.
Test using a clear method
Where there is concern, engage a competent indoor air quality professional or accredited laboratory. Record room conditions, ventilation state, sampling positions and timing. Consumer sensors can help identify patterns, but formal decisions should rely on suitable instruments and a documented method.
Build remediation around evidence
If measurements or professional assessment identify a problem, consider source removal, ventilation and other suitable measures before selecting any surface treatment. Where nano-coating is proposed, define compatible surfaces, treated area, application controls and post-treatment verification in advance.