Salthammer, T.T.Salthammer2022-03-042022-03-042013https://publica.fraunhofer.de/handle/publica/23176710.1002/anie.201205984Formaldehyde has been discussed as a typical indoor pollutant for decades. Legal requirements and ever-lower limits for formaldehyde in indoor air have led to a continual reduction in the amount of formaldehyde released from furniture, building materials, and household products over many years. Slowly, and without much attention from research on indoor air, a change of paradigm is taking place, however. Today, the formaldehyde concentrations in outdoor air, particularly in polluted urban areas, sometimes already reach indoor levels. This is largely a result of photochemical processes and the use of biofuels. In the medium term, this development might have consequences for the way buildings are ventilated and lead to a change in the way we evaluate human exposure.enatmospheric chemistrybiofuelformaldehydeindoor guideline valuesindoor/outdoor relation674540journal article