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- Indoor air quality in the sleeping environments of Lisbon dwellings, Portugal: preliminary results of HypnosAIR projectPublication . Mendez, S.; Gamelas, C.; Belo, Joana; Meira e Cruz, M.; Almeida, S.; Canha, N.Introduction: Given that people spend a third of their lives sleeping and that sleep is essential for the well-being, performance, and health of individuals, the sleeping environments have attracted the attention of the scientific community in recent years to assess exposure levels and how they may affect sleep quality - a question that remains unanswered. In addition, this micro-environment is poorly characterized, leading to an inaccurate assessment of the integrated daily exposure of individuals. Most studies focus on comfort parameters (temperature and humidity) or single pollutants, such as carbon dioxide (CO2). The characterization of indoor air quality (IAQ) during sleep faces several challenges that make it difficult to achieve (such as the noise interference of monitoring equipment in the sleep of individuals) and it is therefore essential to implement monitoring strategies that overcome them. The HypnosAIR research project (www.hypnosair.com) aims to address this challenge by providing an overview of IAQ (focusing on several parameters) in the sleeping environments of 30 dwellings in the Lisbon area, Portugal. This work presents the results obtained so far.