Research from the University of North Carolina (UNC) adds to the growing body of science that demonstrates there are safe levels of formaldehyde inhalation exposure that do not cause any health effects. Typical household concentrations are between 16 and 32 ppb, which are approximately 10x lower than the safe level confirmed by this body of research. The UNC research team pioneered unique biomarkers that help us understand potential health impacts from inhaling formaldehyde. The conclusion is clear and supported by data: at environmentally relevant concentrations inhaled formaldehyde does not travel beyond the nose, thus is not able to interact within other parts of the body to cause effects.