Allergic properties of numerous fragrance substances are recognized today, but the knowledge about long-term inhalative
exposure is still fragmentary. For cosmetics usage of these substances the dermal exposure pathway is considered most important, and data on the sensitizing potential exists, see e.g. Bhatia et al. (2008), Lalko et al. (2007) and Lapczynski et al. (2008). In some countries, such substances are regulated, or the declaration is legally enforced like in e.g. EU (2003). The effectiveness of such risk management efforts is discussed controversially (Klaschka, 2010). Air fresheners and room fragrances, however, are no cosmetic products and the market is therefore mostly unregulated.