Trabalho apresentado em European Aerosol Conference 2023 (EAC2023), September 3−8, 2023, Malaga, SpainN/

Almeida, S. M.

Canha, N.

Gamelas ou Carla A. Gamelas, Carla

Mendez, S.

English

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  Exposure to fine aerosols in sleeping environments of Lisbon dwellings  S. Mendez1,*, C. Gamelas1,2, S.M. Almeida1 and N. Canha1  1 Centro de Ciências e Tecnologias Nucleares (C2TN), Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, Km 139.7, 2695-066 Bobadela LRS, Portugal 2ESTSetúbal/IPS and CINEA, Polytechnic Institute of Setúbal, 2914-508 Setúbal, Portugal Associated conference topics: 4.9, 4.1 Presenting author email: sergiomendez@ctn.tecnico.ulisboa.pt    Since people spend a third of their lives sleeping and that sleep is essential to the well-being, performance and health of individuals, sleeping environments have started to gather the attention of the scientific community in recent years to assess exposure levels and how they may affect sleep quality - this is the question that remains unanswered until now. In addition, this micro-environment is poorly characterized (Canha et al., 2021), leading to 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 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, therefore, it is essential to implement monitoring strategies that overcome them.  The HypnosAir research project (www.hypnosair.com) aims to address this challenge. Preliminary studies carried out by HypnosAir team in Lisbon found that 9 out of 10 bedrooms presented mean PM2.5 levels during the sleeping period above the international guideline value of 5 µg.m-3 recommended by the World Health Organisation (WHO, 2021). Overall, mean PM2.5 levels of 15.3 ± 9.1 µg.m-3 were found for 10 bedrooms in Lisbon (Canha et al., 2020). This preliminary study was carried out using real-time monitoring equipment, which does not allow to provide a chemical characterisation of PM2.5 and, consequently, to perform source apportionment studies.   Figure 1. PM2.5 levels during the sleep period in 10 bedrooms of Lisbon dwellings (Canha et al., 2020). The red line represents the limit value (LV) established by the Portuguese legislation (Portaria nr 138-G/2021, 2021) and the green line represents the guideline value recommended by WHO.    To provide a more complete characterisation of the exposure of individuals to fine aerosols during sleep, HypnosAir aims to sample PM2.5 in 30 bedrooms of Lisbon metropolitan area (both indoors and outdoors) and, then, fully chemically characterise them to quantify the contribution of pollution sources.   To this end, in early 2023, the HypnosAir team started a sampling campaign in 30 dwellings during the sleeping period (weeknights only). For indoor sampling, silent PM2.5 samplers (SILENT Sequential Air Sampler - FAI Instruments S.r.l., Italy) were used, while for parallel outdoor sampling, medium volume samplers (MVS6, Leckel, Sven Leckel, Germany) were used. In each environment, PM2.5 was collected in two different filter matrices, namely, Teflon and quartz, for complementary chemical analyses. PM2.5 levels will be assessed gravimetrically.  The present work will provide the first results of the PM2.5 sampling, using the gravimetric method, which was carried out during the HypnosAir sampling campaign. Parallel outdoor levels will also be assessed.   This work was supported by the Portuguese Foundation for Science and Technology (FCT, Portugal) through the project HypnosAir (PTDC/CTA-AMB/3263/2021), the contract 2021.00088.CEECIND (N. Canha) and the financial support to C2TN/IST (UIDB/04349/2020+UIDP/04349/2020).   Canha et al. (2021) Atmosphere-Basel 12, 110. Canha et al. (2020) Environ. Pollut. 264, 114619. Portaria nr 138-G/2021 (2021) Diário da República 126, 128-(2)-128(6). WHO (2021) WHO global air quality guidelines: particulate matter (PM2.5 and PM10), ozone, nitrogen dioxide, sulfur dioxide and carbon monoxide. World Health Organization.   01020304050607080B1 B2 B3 B4 B5 B6 B7 B8 B9 B10[PM2.5] (µg.m-3)Bedrooms of Lisbon dwellingsLV-PT WHOEuropean Aerosol Conference 2023 (EAC2023), September 3−8, 2023, Malaga, Spain[ 10−R1#6 ]

Exposure to fine aerosols in sleeping environments of Lisbon dwellings

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Exposure to fine aerosols in sleeping environments of Lisbon dwellings

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