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This publication by the World Health Organization serves as a comprehensive guide to improving indoor ventilation in the context of COVID-19. It outlines strategies for various settings, including healthcare and residential environments, to enhance air quality and minimize the transmission of the virus. The document provides technical guidance on ventilation systems, air filtration, and other preventive measures, aiming to support public health efforts. The intended audience includes healthcare professionals, facility managers, and policymakers looking to implement effective ventilation practices during the pandemic.

Ventilation. --- Indoor air quality.

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Nowadays, very much emphasis is put on the low energy demand of buildings and their appropriate quality indoor environment.
Monitoring and controlling indoor air quality are still a difficult process not only because of the rapidly changing conditions but also because of the insufficient amount of data on pollution resulting from construction and finishing materials. Most studies focus on determining the degree of pollution concentration, not at the very level of emissions from their source. The emissivity of construction materials and equipment should be one of the key elements in assessing the correct air quality and thermal comfort. Only a few studies have been carried out on this topic. This work focuses on the selection of the least invasive elements enabling the construction of the test cell and the necessary equipment to maintain optimal thermal and ventilation conditions and so low emission building materials. When assessing the quality of the internal environment, it is recommended to test the content of formaldehyde (HCHO) and volatile organic compounds (VOCs), as one of the best indicators in the global rating. Depending on the available ventilation solutions on the market, it is recommended to choose a solution that will ensure the appropriate amount of supplied air of good quality and will allow the free discharge of pollutants. The main benefits that are discussed in this paper and that would result from the implementation of the project are the possibility of assessing the emission of pollutants from selected materials, estimating thermal efficiency, air quality, and thermal comfort. However, this project is not limited only to research in this area and also enables other tests to be carried out, such as global comfort measurement, including noise, light, tightness, and its easy construction and assembly allow for the connection of other chambers to conduct other tests.

indoor air quality --- low emission building materials --- formaldehyde (HCHO) --- volatile organic compounds (VOCs). --- Ingénierie, informatique & technologie > Energie

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Air pollution, due to natural and anthropogenic sources, incurs enormous environmental costs. The issue of healthy living spaces and good air quality is a global concern, because each individual inhales 15,000 L of air every 24 h. Thus, contemporary monitoring and reducing exposure to air pollutants presents a particular challenge. One of the crucial indicators of indoor and outdoor air quality is bioaerosols. They play an instrumental role as risk factors when it comes to adverse health outcome. These indicators, also known as primary biological airborne particles (PBAPs), have been linked to various health effects such as infectious diseases, toxic effects, allergies, and even cancer. PBAPs include all particles with a biological source in suspension in the air (bacteria, fungi, viruses, and pollen), as well as biomolecules (toxins, and debris from membranes). To foster our current scientific knowledge on bioaerosols, research related to the characteristics of biological aerosols in indoor and outdoor environments, the methods used to improve air quality, as well as the health effects of and exposure assessments to bioaerosols, have been collected in this book.

Humanities --- Social interaction --- radiant catalytic ionization --- Enterococcus spp. --- Clostridioides difficile --- Staphylococcus aureus --- MRSA --- indoor air --- microbiological indoor air quality (MIAQ) --- bacterial aerosol (BA) --- size distribution --- gymnastic hall --- multi-antibiotic resistance (MAR) --- indoor microclimate --- decentralized façade ventilation --- air quality --- indoor air quality --- microbiological contamination --- heterotrophic bacteria --- antimicrobial resistance --- mannitol-positive staphylococci --- fungi --- biological air pollutants --- fungal aerosol --- air cleaner --- life cycle assessment

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This Special Issue aims to make a concrete technical contribution to the solution of the various problems related to indoor air pollution. In 11 papers, international scientists report the last findings in this field from different points of view including topics such as the IAQ legislation, the role of IAQ in schools, hospitals and (micro)environments in general, the performance of an olfactometer system or the impact of an indoor malodor, BTEX measures in a Fire Station, and a chemical characterization of e-cigarette (e-cig) refill liquids (e-liq). It seems appropriate to encourage the development of reference values or specific action values in order to better manage particularly problematic situations in these environments. In the absence of national references to be used for a comparison, it is possible to use those reported in the legislation of other European countries or, by ad hoc working groups or by analogy, to use other standards such as those relating to ambient air.

indoor air quality --- aerosols --- particle size distributions --- ultrafine particles --- particulate matter (PM) --- smoking --- combustion --- malodor --- indoor air --- human olfaction --- volatile organic compound (VOC) --- microbial volatile organic compound (MVOC) --- VOC --- MVOC --- health effects --- smell --- malodor mitigation --- air fresheners --- fragrance --- computational fluid dynamics --- CO2 concentration --- Sansevieria trifasciata --- ventilation --- educational buildings --- schools --- field measurements --- indoor air quality (IAQ) --- thermal comfort --- thermal perception --- health symptoms --- air infiltration --- healthcare settings --- chemical and biological pollution --- quality improvement --- Italian context --- legislation --- Europe --- focus --- residential --- pollutants --- TLV --- health --- workers --- school --- electronic cigarettes --- flavoring additives --- BTEX --- contamination --- headspace solid micro phase extraction --- gas chromatography-olfactometry --- human health --- EU regulation --- BTEXS --- health exposure --- occupational risk --- markers of exposure --- air quality --- odor threshold --- olfactometry --- Sniffin’ Sticks --- chemosensory perception --- validity assessment --- exposure assessment --- children --- number concentration --- lung-deposited surface area --- dose --- life cycle assessment --- sustainable neighborhood --- Belgium --- urban scale --- roof stacking --- n/a --- Sniffin' Sticks

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Although air pollution is usually linked with human activities, natural processes may also lead to major concentrations of hazardous substances in the low atmosphere. Pollutant levels may be reduced when emissions can be controlled. However, the impact of meteorological variables on the concentrations measured may be noticeable, and these variables cannot be controlled. This book is devoted to the influence of meteorological processes on the pollutant concentrations recorded in the low atmosphere. Measurements, cycles, statistical procedures, as well as specific variables such as the synoptic pattern, temperature inversion, or the calculation of back-trajectories, are considered in the studies included in this book to highlight the relationship between air pollution and meteorological variables. In addition, the state of the art of this subject following meteorological scales, from micro to macro-scale, is presented. Consequently, this book focuses on applied science and seeks to further current knowledge of what contribution meteorological processes make to the concentrations measured in order to achieve greater control over air pollution.

Research & information: general --- air pollution --- synoptic situation pattern --- meteorological variables --- threshold values --- air quality forecast --- modelling --- pollution episodes --- national holiday --- COVID-19 --- particulate matter --- natural ventilation --- indoor air quality --- regional variation --- nitrogen dioxide --- in situ urban concentrations --- meteorological measurements --- NO2 variation --- partial correlation --- gross alpha activity --- northern Iberian Peninsula --- radon --- airflow patterns --- surface winds --- atmospheric boundary layer --- weather types --- Gaussian plume model --- low-level jet --- recirculation --- microscale --- macroscale --- mesoscale --- source apportionment --- cluster analysis --- health risks --- residential wood burning --- sustainable urban development --- urban haze --- temperature inversion --- Obukhov length --- HYSPLIT --- biomass burning --- cold surge, emission --- BaP --- HPLC --- carcinogenic --- diagnostic ratio