However, in 2004, formaldehyde discussions were generally taken up again when formaldehyde was considered as carcinogenic for humans.

Well-known examples are reports about increasedformaldehyde emission from furniture coatings in Germany (1992) and high formaldehyde concentrations in mobile homes in the United States (2006). For this reason, formaldehyde slipped out of the primary focus of indoor research in the 1990s, although special formaldehyde-related events occasionally come to the attention of the general public. On the other hand, formaldehyde concentrations in ambient air are increasing continuously, especially in the urban environment. Over the years, the release of formaldehyde from building products has been decreasing. This meant there was a strong demand for simple laboratory test methods. Although the chamber method is very reliable, it is also time-consuming and expensive. In Germany and the United States, large-scale test chambers were used for the evaluation of emissions.

The first regulations followed in the United States in 1985 or thereabouts. Criteria for the limitation and regulation of formaldehyde emissions from wood-based materials were established in 1981 in Germany and Denmark. As a consequence, a guideline value of 0.1 ppm was proposed in 1977 by the former German Federal Agency of Health to limit human exposure in dwellings. Formaldehyde emissions from particle boards bonded with urea formaldehyde resin were soon identified as the cause of the complaints. Adverse health effects from exposure to formaldehyde in prefabricated houses, especially irritation of the eyes and upper airways, were first reported in the mid-1960s. Particle board and other wood-based panels were subsequently also used for the construction of housing. Since 1950, particle board has become an attractive alternative to solid wood for the manufacturing of furniture. The first commercial particle board was produced during World War II in Bremen, Germany. (1) Between 19, formaldehyde-based resins became important adhesives for wood and wood composites. In 1944, Walker published the first edition of his classic work Formaldehyde. The versatility that makes it suitable for use in various industrial applications was soon discovered, and the compound was one of the first to be indexed by Chemical Abstracts Service (CAS). The technical synthesis by dehydration of methanol was achieved in 1867 by the German chemist August Wilhelm von Hofmann. Formaldehyde was described in the year 1855 by the Russian scientist Alexander Michailowitsch Butlerow.

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