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Human thermal sensation and its algorithmic modelization under dynamic environmental thermal characteristics of vehicle cabin Indoor Air (IF 5.8) Pub Date : 2022-12-25 Weijian Li, Jiqing Chen, Fengchong Lan, Hailiang Xie
Thermal conditions are strongly changeable in a vehicle cabin, where passengers could suffer consecutive self-thermoregulation to such dynamic changing thermal stresses, though its HVAC system works well. To observe human overall and local thermal sensations in dynamic thermal conditions, a series of experiments under various conditions were carried out in a cabin-like climate chamber. The results
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Contactless sleep posture measurements for demand-controlled sleep thermal comfort: A pilot study Indoor Air (IF 5.8) Pub Date : 2022-12-25 Xiaogang Cheng, Fei Hu, Bin Yang, Faming Wang, Thomas Olofsson
Thermal comfort during sleep is essential for both sleep quality and human health while sleeping. There are currently few effective contactless methods for detecting the sleep thermal comfort at any time of day or night. In this paper, a vision-based detection approach for human thermal comfort while sleeping was proposed, which is intended to avoid overcooling/overheating supply, meet the thermal
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Indoor PM2.5 from occupied residences in Sweden caused higher inflammation in mice compared to outdoor PM2.5 Indoor Air (IF 5.8) Pub Date : 2022-12-12 Aneta Wierzbicka, Yuliya Omelekhina, Anne Thoustrup Saber, Erica Bloom, Louise Gren, Sarah Søs Poulsen, Bo Strandberg, Joakim Pagels, Nicklas Raun Jacobsen
We spend most of our time indoors; however, little is known about the effects of exposure to aerosol particles indoors. We aimed to determine differences in relative toxicity and physicochemical properties of PM2.5 collected simultaneously indoors (PM2.5 INDOOR) and outdoors (PM2.5 OUTDOOR) in 15 occupied homes in southern Sweden. Collected particles were extracted from filters, pooled (indoor and
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Personal comfort models based on a 6-month experiment using environmental parameters and data from wearables Indoor Air (IF 5.8) Pub Date : 2022-11-25 Federico Tartarini, Stefano Schiavon, Matias Quintana, Clayton Miller
Personal thermal comfort models are a paradigm shift in predicting how building occupants perceive their thermal environment. Previous work has critical limitations related to the length of the data collected and the diversity of spaces. This paper outlines a longitudinal field study comprising 20 participants who answered Right-Here-Right-Now surveys using a smartwatch for 180 days. We collected more
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Short- versus long-term tests of indoor radon for risk assessment by Monte-Carlo method towards effective measurement strategy Indoor Air (IF 5.8) Pub Date : 2022-11-25 Andrey Tsapalov, Konstantin Kovler
There now exists a broad consensus among the European radon community members that long-term measurements are the best practice in managing the risk of indoor radon exposure. This, not with standing the fact that <1% of buildings have been tested in Europe so far. At the same time, US' experience over the years shows more effective regulation has been accomplished through tests that are short-term
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Trimester-specific association of perceived indoor air quality with antenatal depression: China Medical University Birth Cohort Study Indoor Air (IF 5.8) Pub Date : 2022-11-25 Jiajin Hu, Ningyu Wan, Yanan Ma, Yilin Liu, Borui Liu, Lin Li, Caixia Liu, Chong Qiao, Deliang Wen
Antenatal depression is associated with adverse birth and long-term outcomes for mothers and children. Pregnant women spend 90% of time indoors; however, the association between indoor air quality and risk of antenatal depression has not been established. In this study, we aim to determine the total and trimester-specific association of perceived indoor air quality (PIAQ) with antenatal depression
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Association of indoor noise level with depression in hotel workers: A multicenter study from 111 China's cities Indoor Air (IF 5.8) Pub Date : 2022-11-25 Li Li, Hang Liu, Lin Fan, Nan Zhang, Xinqi Wang, Xu Li, Xu Han, Tanxi Ge, Xiaoyuan Yao, Lijun Pan, Liqin Su, Xianliang Wang
Several studies have elucidated the link between outdoor noise and depression, but the relationship between indoor noise levels and depression symptoms in residential and public places remains unclear. This study was a multicenter observational study with a cross-sectional design. In 2019, a total of 10 545 indoor noise levels on-site and 26 018 health data from practitioners were collected from 2402
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Prediction of indoor PM2.5 concentrations and reduction strategies for cooking events through various IAQ management methods in an apartment of South Korea Indoor Air (IF 5.8) Pub Date : 2022-11-25 Younghun Kim, Dongho Shin, Kee-Jung Hong, Gunhee Lee, Sang Bok Kim, Inyong Park, Hak-Joon Kim, Yong-Jin Kim, Bangwoo Han, Jungho Hwang
Indoor PM2.5 in apartments must be effectively managed to minimize adverse impacts on human health. Cooking is the one of the main PM2.5 sources in apartments, and indoor air quality (IAQ) management methods (natural ventilation, mechanical ventilations, range hoods, and air purifiers) are typically used to reduce PM2.5 generated during cooking. For effective control of indoor PM2.5, prediction of
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Effect of experimental exposures to 3-D printer emissions on nasal allergen responses and lung diffusing capacity for inhaled carbon monoxide/nitric oxide in subjects with seasonal allergic rhinitis Indoor Air (IF 5.8) Pub Date : 2022-11-25 Philipp Würzner, Rudolf A. Jörres, Stefan Karrasch, Caroline Quartucci, Stephan Böse-O'Reilly, Dennis Nowak, Stefan Rakete
3-D printers are widely used. Based on previous findings, we hypothesized that their emissions could enhance allergen responsiveness and reduce lung diffusing capacity. Using a cross-over design, 28 young subjects with seasonal allergic rhinitis were exposed to 3-D printer emissions, either from polylactic acid (PLA) or from acrylonitrile butadiene styrene copolymer (ABS), for 2 h each. Ninety minutes
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Partition of phthalates among air, PM2.5, house dust and skin in residential indoor environments Indoor Air (IF 5.8) Pub Date : 2022-11-25 Jinding Huang, Xiaoke Wang, Jifeng Guo, Xiaolu Wang, Mengli Ji, Lihui Huang
As a group of typical endocrine disrupters, phthalates are simultaneously present in a variety of environmental media and enter human body through multiple exposure pathways. In this study, field monitoring data were used to characterize the skin-air (Klg), dust-air (Kd), and PM2.5-air (Kp) partition coefficients of DiBP, DnBP, and DEHP. The median values of log(Klg) in the summer and winter were 7
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A model to evaluate ozone distribution and reaction byproducts in aircraft cabin environments Indoor Air (IF 5.8) Pub Date : 2022-11-25 Junzhou He, Yihui Yin, Jingjing Pei, Yuexia Sun, Zhijian Liu, Qingyan Chen, Xudong Yang
Ozone and byproducts of ozone-initiated reactions are among the primary pollutants in aircraft cabins. However, investigations of the spatial distribution and reaction mechanisms of these pollutants are insufficient. This study established a computational fluid dynamics-based model to evaluate ozone and byproduct distribution, considering ozone reactions in air, adsorption onto surfaces, and byproduct
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Impact of do-it-yourself air cleaner design on the reduction of simulated wildfire smoke in a controlled chamber environment Indoor Air (IF 5.8) Pub Date : 2022-11-25 Amara L. Holder, Hannah S. Halliday, Larry Virtaranta
During wildfire smoke events public health agencies release advisories to stay indoors, close doors and windows, and operate a portable air cleaner (PAC). The do-it-yourself (DIY) air cleaner consisting of a box fan and a furnace filter is a widely used low-cost alternative to commercial PACs because of its increased accessibility. In this study, we evaluate the clean air delivery rate (CADR) of different
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Combining Phi6 as a surrogate virus and computational large-eddy simulations to study airborne transmission of SARS-CoV-2 in a restaurant Indoor Air (IF 5.8) Pub Date : 2022-11-27 Lotta Oksanen, Mikko Auvinen, Joel Kuula, Rasmus Malmgren, Martin Romantschuk, Antti Hyvärinen, Sirpa Laitinen, Leena Maunula, Enni Sanmark, Ahmed Geneid, Svetlana Sofieva, Julija Salokas, Helin Veskiväli, Tarja Sironen, Tiia Grönholm, Antti Hellsten, Nina Atanasova
COVID-19 has highlighted the need for indoor risk-reduction strategies. Our aim is to provide information about the virus dispersion and attempts to reduce the infection risk. Indoor transmission was studied simulating a dining situation in a restaurant. Aerosolized Phi6 viruses were detected with several methods. The aerosol dispersion was modeled by using the Large-Eddy Simulation (LES) technique
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Modeling the effect of temperature and relative humidity on exposure to SARS-CoV-2 in a mechanically ventilated room Indoor Air (IF 5.8) Pub Date : 2022-11-27 Timothy G. Foat, Benjamin Higgins, Charlotte Abbs, Thomas Maishman, Simon Coldrick, Adrian Kelsey, Matthew J. Ivings, Simon T. Parker, Catherine J. Noakes
Computational fluid dynamics models have been developed to predict airborne exposure to the SARS-CoV-2 virus from a coughing person in a mechanically ventilated room. The models were run with three typical indoor air temperatures and relative humidities (RH). Quantile regression was used to indicate whether these have a statistically significant effect on the airborne exposure. Results suggest that
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Impact of ventilation methods on indoor particle concentrations in a daycare center Indoor Air (IF 5.8) Pub Date : 2022-11-27 Junseok Park, Jihyun Yoo, Jae-Weon Jeong
The objective of this study was to quantify the influence of ventilation methods on children's exposure to indoor particles in a daycare center located in an urban area. The ventilation methods applied to the center were monitored for 1 year. It appears that indoor PM10 and PM2.5 concentrations of the center were basically determined by outdoor conditions. The fluctuations in outdoor particle concentration
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Numerical modeling of sneeze airflow and its validation with an experimental dataset Indoor Air (IF 5.8) Pub Date : 2022-11-27 Wonseok Oh, Ryozo Ooka, Hideki Kikumoto, Mengtao Han
In this study, we aimed at providing datasets using experimental results to validate the sneeze airflow. In addition, the boundary conditions for the sneeze simulation that could reproduce the sneeze airflow in the experimental results are presented and reviewed. The validation datasets were created by performing ensemble-average analysis with the experimental results of particle image velocimetry
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Sweet foods dietary pattern enhances negative associations of perceived indoor air quality during pregnancy with postpartum depression Indoor Air (IF 5.8) Pub Date : 2022-11-18 Jiajin Hu, Yilin Liu, Yanan Ma, Ming Gao, Ningyu Wan, Lin Li, Borui Liu, Deliang Wen
Postpartum depression (PPD) is possibly caused by indoor air pollution and may be modified by maternal diet during pregnancy. Using the data from a prospective cohort study, we examined the interaction between indoor air quality and maternal dietary patterns on PPD development. A perceived indoor air quality (PIAQ) score was used to assess indoor air pollution. A higher PIAQ score indicated a worse
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Why should we target the burden of disease for indoor air pollutants? Indoor Air (IF 5.8) Pub Date : 2022-11-18 Ningrui Liu, Zhuohui Zhao, Corinne Mandin, Haidong Kan, Yinping Zhang
People spend more than 80% of their lifetime indoors, and inhaled air is more than 75% of an individual's daily mass intake of air, food, and water.1, 2 Indoor air pollution often consists of more complex components and higher pollutant concentrations than outdoor air due to additional indoor sources and poor ventilation.3, 4 From the perspectives of public health and engineering control, the ultimate
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Exposure at the indoor water–air interface: Fill water constituents and the consequent air emissions from ultrasonic humidifiers: A systematic review Indoor Air (IF 5.8) Pub Date : 2022-11-18 Andrea M. Dietrich, Wenchuo Yao, Daniel L. Gallagher
This systematic review investigates the emissions from ultrasonic humidifiers (e.g., cool mist humidifiers) within indoor air environments, namely soluble and insoluble metals and minerals as well as microorganisms and one organic chemical biocide. Relationships between ultrasonic humidifier fill water quality and the emissions in indoor air are studied, and associated potential adverse health outcomes
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A systematic review of ventilation conditions and airborne particulate matter levels in urban offices Indoor Air (IF 5.8) Pub Date : 2022-11-18 Fátima Felgueiras, Zenaida Mourão, André Moreira, Marta Fonseca Gabriel
Many working activities are carried out in office buildings that are located in urban areas. Several studies have shown that these workplaces are likely to present poor indoor environmental quality (IEQ) due to inadequate ventilation rates, compromised thermal comfort conditions, and/or high concentration of air pollutants, such as particulate matter. This study aimed to review ventilation conditions
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High-rise residential building ventilation in cold climates: A review of ventilation system types and their impact on measured building performance Indoor Air (IF 5.8) Pub Date : 2022-11-18 Justin Berquist, Noah Cassidy, Marianne Touchie, William O'Brien, Jamie Fine
Ventilation system performance in high-rise multi-unit residential buildings (MURBs) has a significant impact on resident wellbeing. While the importance of ventilation is well established, it is commonly overlooked since underperformance often goes undetected. This article presents a review and synthesis of ventilation system performance in high-rise MURBs located in cold climates as it relates to
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Health effects of exposure to sulfur dioxide, nitrogen dioxide, ozone, and carbon monoxide between 1980 and 2019: A systematic review and meta-analysis Indoor Air (IF 5.8) Pub Date : 2022-11-18 Zhuoru Chen, Ningrui Liu, Hao Tang, Xuehuan Gao, Yinping Zhang, Haidong Kan, Furong Deng, Bin Zhao, Xiangang Zeng, Yuexia Sun, Hua Qian, Wei Liu, Jinhan Mo, Xiaohong Zheng, Chen Huang, Chanjuan Sun, Zhuohui Zhao
The burden of disease attributed to the indoor exposure to sulfur dioxide (SO2), nitrogen dioxide (NO2), ozone (O3), and carbon monoxide (CO) is not clear, and the quantitative concentration–response relationship is a prerequisite. This is a systematic review to summarize the quantitative concentration–response relationships by screening and analyzing the polled effects of population-based epidemiological
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Numerical model for cough-generated droplet dispersion on moving escalator with multiple passengers Indoor Air (IF 5.8) Pub Date : 2022-11-18 Ayato Takii, Masashi Yamakawa, Atsuhide Kitagawa, Tomoaki Watamura, Yongmann M. Chung, Minsuok Kim
To investigate the motion of virus-laden droplets between moving passengers in line, we performed numerical simulations of the distribution of airborne droplets within a geometrically detailed model similar to an actual escalator. The left and right sides and the ceiling of the escalator model were surrounded by walls, assuming a subway used by many people every day with concern to virus-laden droplets
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Characterization of fine particulate matter from indoor cooking with solid biomass fuels Indoor Air (IF 5.8) Pub Date : 2022-11-18 Axel Eriksson, Asmamaw Abera, Ebba Malmqvist, Christina Isaxon
Household burning of solid biomass fuels emits pollution particles that are a huge health risk factor, especially in low-income countries (LICs) such as those in Sub-Saharan Africa. In epidemiological studies, indoor exposure is often more challenging to assess than outdoor exposure. Laboratory studies of solid biomass fuels, performed under real-life conditions, are an important path toward improved
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Polybrominated diphenyl ethers and polycyclic aromatic hydrocarbons in dust from different indoor environments in Zagreb, Croatia: Levels and human exposure assessment Indoor Air (IF 5.8) Pub Date : 2022-11-18 Marija Dvoršćak, Ivana Jakovljević, Karla Jagić, Blanka Tariba Lovaković, Darija Klinčić
The present study reports for the first time the levels of 7 polybrominated diphenyl ether (PBDE) congeners and 11 polycyclic aromatic hydrocarbons (PAH) measured in dust samples collected in 10 kindergartens, 11 workplaces, and 25 cars from Zagreb, Croatia. ΣPBDEs mass fractions were 3.11–14.42, 10−6 in the worst-case scenario indicated a potential risk, especially for professional drivers. Also,
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A review of critical residential buildings parameters and activities when investigating indoor air quality and pollutants Indoor Air (IF 5.8) Pub Date : 2022-11-18 María Teresa Baeza_Romero, Marzenna R. Dudzinska, Mehdi Amouei Torkmahalleh, Nelson Barros, Ann Marie Coggins, Duygu Gazioglu Ruzgar, Ivana Kildsgaard, Motahareh Naseri, Li Rong, John Saffell, Ana Maria Scutaru, Amelia Staszowska
Indoor air in residential dwellings can contain a variety of chemicals, sometimes present at concentrations or in combinations which can have a negative impact on human health. Indoor Air Quality (IAQ) surveys are often required to characterize human exposure or to investigate IAQ concerns and complaints. Such surveys should include sufficient contextual information to elucidate sources, pathways,
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Time-resolved dynamic disability adjusted life-years estimation Indoor Air (IF 5.8) Pub Date : 2022-11-18 Klaas De Jonge, Jelle Laverge
The quantification of how healthy the indoor air is, is a complex issue comprising of a large number of contaminants of various sources. The health implication of exposure to each of the contaminant deemed of importance can be expressed using Disability Adjusted Life Years (DALYs). The sum of all DALYs indicates how harmful the indoor air was during the investigated time-frame. This metric was originally
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Airplane cabin mixing ventilation with time-periodic supply: Contaminant mass fluxes and ventilation efficiency Indoor Air (IF 5.8) Pub Date : 2022-11-18 Jo-Hendrik Thysen, Twan van Hooff, Bert Blocken, GertJan van Heijst
Airplane cabin ventilation is essential to ensure passengers' well-being. The conventional ventilation method is mixing ventilation with a statistically steady supply, which, according to former studies, has reached its limits regarding, for example, the ventilation efficiency. However, the effect of a statistically unsteady (time-periodic) supply on the mixing ventilation efficiency has remained largely
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Effects of occupant behaviors on perceived dormitory air quality and sick building syndrome symptoms among female college students Indoor Air (IF 5.8) Pub Date : 2022-11-18 Ruohong Qiao, Xinyuan Lou, Yuexia Sun, Yingjun Liu
We performed a cross-sectional survey of 2143 female students in a university in Tianjin, China regarding perceived air quality (PAQ) and sick building syndrome (SBS) symptoms in the student dormitory. The prevalence of general, mucosal, and skin symptoms was 22.1%, 21.9%, and 26.3%, respectively. The three most prevalent PAQ complaints were “dry air” (48.9% often), “stuffy odor” (18.2%), and “other
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Lung cancer as adverse health effect by indoor radon exposure in China from 2000 to 2020: A systematic review and meta-analysis Indoor Air (IF 5.8) Pub Date : 2022-11-18 Chunxiao Su, Minyi Pan, Ningrui Liu, Yinping Zhang, Haidong Kan, Zhuohui Zhao, Furong Deng, Bin Zhao, Hua Qian, Xiangang Zeng, Yuexia Sun, Wei Liu, Jinhan Mo, Jianguo Guo, Xiaohong Zheng, Chanjuan Sun, Zhijun Zou, Hao Li, Chen Huang
Indoor radon exposure is thought to be associated with adverse health effect as lung cancer. Lung cancer incidences in China have been the highest worldwide during the past two decades. It is important to quantitively address indoor radon exposure and its health effect, especially in countries like China. In this paper, we have conducted a meta-analysis based on indoor radon and its health effect studies
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Psychometric properties of a novel instrument for evaluating indoor air pollution health literacy in adults Indoor Air (IF 5.8) Pub Date : 2022-11-18 Jia-Ling Wu, Yu-Han Huang, Yi-Chin Huang, Wen-Hsuan Hou, Chien-Cheng Jung, Pei-Chen Lee, Ming-Yeng Lin, Chung-Yi Li
This study aimed to develop and validate the psychometric properties of a novel instrument that measures Indoor Air Pollution Health Literacy (IAPHL). The qualitative phase was conducted to design questions based on the conceptual model of the European Health Literacy Survey Questionnaire. We developed a 38-item instrument covering 12 constructs, that is, four information competencies within three
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Moldy odor from air conditioners in the residences of Japanese participants with and without asthma Indoor Air (IF 5.8) Pub Date : 2022-11-18 Naoki Okada, Yoshiki Shiraishi, Katsuyoshi Tomomatsu, Tsuyoshi Oguma, Koichiro Asano
Fungi, a major allergen associated with asthma onset and severity, can contaminate air conditioners if not properly maintained. We surveyed the prevalence and risk factors associated with fungal contamination of air conditioners and patient behavior to reduce this contamination. Japanese adults aged ≥30 years registered in the database of an Internet research company were asked to participate in an
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Resuspension of particles deposited by nano-enabled consumer sprays: The role of product type, flooring material, and resuspension force Indoor Air (IF 5.8) Pub Date : 2022-11-18 Ruikang He, Jie Zhang, Gediminas Mainelis
With the development of nanotechnology, an increasing number of nano-enabled consumer products are introduced into the market. The release, deposition, and resuspension of particles from such products could be an important contributor to indoor air pollution and adverse health effects. Our study tested the spray and resuspension of seven nano-enabled consumer products and investigated how flooring
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Experimental study of the negative effects of raised bedroom temperature and reduced ventilation on the sleep quality of elderly subjects Indoor Air (IF 5.8) Pub Date : 2022-11-18 Yan Yan, Haodong Zhang, Mengyuan Kang, Li Lan, Zhentao Wang, Yanbin Lin
This study investigated the effects of air temperature and ventilation on the sleep quality of elderly subjects and elucidated the mechanisms involved. Sixteen subjects aged over 65 years old were exposed to four conditions in a 2 × 2 design: air temperatures of 27°C and 30°C (with a ceiling fan in operation at 30°C) and two ventilation conditions (with and without mechanical ventilation) in experimental
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The impact of ventilation rate on reducing the microorganisms load in the air and on surfaces in a room-sized chamber Indoor Air (IF 5.8) Pub Date : 2022-11-18 Waseem Hiwar, Marco-Felipe King, Harith Kharrufa, Emma Tidswell, Louise A. Fletcher, Catherine J. Noakes
Hospital-acquired infections (HAIs) are a global challenge incurring mortalities and high treatment costs. The environment plays an important role in transmission due to contaminated air and surfaces. This includes microorganisms' deposition from the air onto surfaces. Quantifying the deposition rate of microorganisms enables understanding surface contamination and can inform strategies to mitigate
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Air concentrations of volatile organic compounds associated with conventional and “green” cleaning products in real-world and laboratory settings Indoor Air (IF 5.8) Pub Date : 2022-11-18 Lucia Calderon, Randy Maddalena, Marion Russell, Sharon Chen, James E. S. Nolan, Asa Bradman, Kim G. Harley
The use of household cleaning products can result in exposure to potentially hazardous volatile and semi-volatile organic compounds (VOCs and SVOCs). “Green” cleaning products have become increasingly available, but there is no official “green” standard, and it is difficult for consumers to know what chemicals they may be exposed to while cleaning. We measured air concentrations of 46 VOCs and SVOCs
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A longitudinal study on the effects of hygro-thermal conditions and indoor air pollutants on building-related symptoms in office buildings Indoor Air (IF 5.8) Pub Date : 2022-11-18 Kenichi Azuma, Naoki Kagi, U Yanagi, Hoon Kim, Haruki Osawa
We conducted a longitudinal epidemiological study for over 1 year in Tokyo and Osaka, Japan, beginning June 2015, to examine the association between indoor environmental factors and building-related symptoms (BRSs) in office workers. Data were obtained from 483 subjects (225 females and 258 males) in 24 office rooms in 11 office buildings. Environmental monitoring was conducted for hygro-thermal conditions
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Plaque-forming units from air samples: Letter to Editor. Re: Jefferson et al., Indoor Air, 2022. Indoor Air (IF 5.8) Pub Date : 2022-11-01 Nuno Rufino de Sousa,Laura Steponaviciute,Lucille Margerie,Karolina Nissen,Midori Kjellin,Björn Reinius,Erik Salaneck,Klas I Udekwu,Antonio Gigliotti Rothfuchs
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Scent of knowledge: The molecular fingerprint of volatiles in an emblematic historical library in Italy Indoor Air (IF 5.8) Pub Date : 2022-10-27 Teresa Cecchi
Heritage guidelines recognize odors as a value associated with a place. This study aims to clarify the connection between heritage and volatile organic compounds at the molecular level. At variance with previous studies, usually focused only on book-related compounds from accelerated degradation tests, the whole air of one of the most significant historical libraries in Italy was studied. A sampling
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SARS-CoV-2 indoor environment contamination with epidemiological and experimental investigations Indoor Air (IF 5.8) Pub Date : 2022-10-24 Lotta-Maria A. H. Oksanen, Jenni Virtanen, Enni Sanmark, Noora Rantanen, Vinaya Venkat, Svetlana Sofieva, Kirsi Aaltonen, Ilkka Kivistö, Julija Svirskaite, Aurora Díaz Pérez, Joel Kuula, Lev Levanov, Antti-Pekka Hyvärinen, Leena Maunula, Nina S. Atanasova, Sirpa Laitinen, Veli-Jukka Anttila, Lasse Lehtonen, Maija Lappalainen, Ahmed Geneid, Tarja Sironen
SARS-CoV-2 has been detected both in air and on surfaces, but questions remain about the patient-specific and environmental factors affecting virus transmission. Additionally, more detailed information on viral sampling of the air is needed. This prospective cohort study (N = 56) presents results from 258 air and 252 surface samples from the surroundings of 23 hospitalized and eight home-treated COVID-19
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Numerical investigation of the convective heat transfer coefficient for a sleeping infant in a ventilation room Indoor Air (IF 5.8) Pub Date : 2022-10-24 Shu Jiang, Mengying Zhang, Shitan Wang, Jun Li
This study aimed to investigate the influence of wind speed and direction on the convective heat transfer from a sleeping infant in different postures. A computational fluid dynamics (CFD) model of a virtual infant manikin with realistic dimensions was developed to obtain the convective heat transfer coefficient (hc) at the body surface and the airflow and temperature distributions. The numerical model
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Application of data-driven RANS model in simulating indoor airflow Indoor Air (IF 5.8) Pub Date : 2022-10-24 Bingqian Chen, Sumei Liu, Junjie Liu, Nan Jiang, Qingyan Chen
The indoor environment has a significant impact on our wellbeing. Accurate prediction of the indoor air distribution can help to create a good indoor environment. Reynolds-averaged Navier–Stokes (RANS) models are commonly used for indoor airflow prediction. However, the Boussinesq hypothesis used in the RANS model fails to account for indoor anisotropic flows. To solve this problem, this study developed
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Additives influence 3D printer emission profiles: Implications for working safely with polymer filament composites Indoor Air (IF 5.8) Pub Date : 2022-10-24 W. Cary Hill, Daniel W. Seitz, Matthew S. Hull, Mark L. Ballentine, Alan J. Kennedy
It is critical to thoroughly investigate, characterize, and understand the unique emission profiles of common and novel polymer feedstocks used in fused filament fabrication (FFF) 3D printers as these products become increasingly ubiquitous in consumer and industrial environments. This work contributes unique insights regarding the effects of polymer composite feedstocks with metal, ceramic, or carbonaceous
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Indoor dryness and humidification-induced arsenic inhalation exposure above 4200 m in Ngari, China Indoor Air (IF 5.8) Pub Date : 2022-10-24 Mengjie Duan, Yiran Lu, Yifan Li, Jianjian Wei, Hua Qian, Borong Lin, Li Liu
Ngari Prefecture, Tibet, China, features its ultrahigh altitude above 4200 m, very little annual precipitation and extremely low relative humidity. Residents who have migrated to Tibet from the plains use indoor humidification to reduce the respiratory discomfort caused by prolonged exposure to dry indoor air. In this study, field investigations and analysis of residential indoor environments and humidification
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Evaluation of fixed and adaptive concentration thresholds for particle filter systems Indoor Air (IF 5.8) Pub Date : 2022-10-24 Alexander Y. Mendell, Alexander W. Olson, Jeffrey A. Siegel
Particle filtration can effectively reduce indoor concentrations of particulate matter (PM) but may incur high energy use. This study evaluates fixed and adaptive concentration thresholds to automate the operation of filtration systems. Simulated environments were derived from week-long continuous PM measurements from Dylos DC1700 (N = 104) and Alphasense OPC-N2 (N = 100) particle counters deployed
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A comprehensive survey analysis focusing on the effect of living literacy on residential environment and health recognition under COVID-19 in Japan Indoor Air (IF 5.8) Pub Date : 2022-10-24 Takashi Kawasaki, Koki Kikuta, Motoya Hayashi, Michiko Bando, Kenichi Hasegawa, Takao Sawachi
Appropriate knowledge and actions of residents in housing are expected to reduce health effects, defined as “living literacy.” With the spread of COVID-19 and the diversification of lifestyles, a quantitative evaluation of a comprehensive model that includes living literacy in the housing environment is required. In this study, the author conducted two web-based surveys of approximately 2000 different
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A new beginning for the indoor air science community Indoor Air (IF 5.8) Pub Date : 2022-10-24 Yuguo Li
It has been an emotional experience for me to resign from my post as fourth editor-in-chief of Indoor Air, in advance of the planned transfer of the journal to a new platform on January 1, 2023. Indoor Air is an international and multidisciplinary research journal dedicated to indoor air sciences. Its inaugural issue was published in March 1991,1-3 and the journal was soon backed by the International
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Facial skin temperature and its relationship with overall thermal sensation during winter in Changsha, China Indoor Air (IF 5.8) Pub Date : 2022-10-24 Xiaoyu Tian, Junyu Yu, Weiwei Liu
Facial skin temperature has been applied to evaluate thermal comfort in a few studies, but the related theoretical basis is not sufficient. We conducted a climate-controlled experiment in winter. The air temperatures were 12, 15, 18, 21, and 24°C, and the relative humidity was set to 60%. During exposure (140 min), the subjects were in a sedentary state, and their thermal sensation, comfort, and acceptability
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Development and application of the Ames test using a direct-exposure module: The assessment of mutagenicity of incense and sidestream cigarette smoke Indoor Air (IF 5.8) Pub Date : 2022-10-24 Po-Wen Chen, Hung-Fu Lu, Zhen-Shu Liu
We had previously developed an improved Ames module to directly determine the mutagenicity of gaseous formaldehyde (HCHO) and toluene without liquid extraction. This study further evaluated the suitability and sensitivity of this module on whole and real polluted air samples. For this, two common brands of stick incense (A and B) and cigarettes (A and B) were harvested, and various types of incense
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Indoor formaldehyde levels in residences, schools, and offices in China in the past 30 years: A systematic review Indoor Air (IF 5.8) Pub Date : 2022-10-24 Lin Fang, Ningrui Liu, Wei Liu, Jinhan Mo, Zhuohui Zhao, Haidong Kan, Furong Deng, Chen Huang, Bin Zhao, Xiangang Zeng, Yuexia Sun, Hua Qian, Chanjuan Sun, Jianguo Guo, Xiaohong Zheng, Yinping Zhang
Exposure to formaldehyde causes a variety of adverse health outcomes, while the distributions of indoor formaldehyde in different building types are still not clear in China. In this study, based on the systematic review of previously published data and Monte Carlo simulation, we assessed geographical and temporal distributions of indoor formaldehyde concentrations in residences, schools, and offices
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A multi-layered strategy for COVID-19 infection prophylaxis in schools: A review of the evidence for masks, distancing, and ventilation Indoor Air (IF 5.8) Pub Date : 2022-10-24 Robert S. McLeod, Christina J. Hopfe, Eberhard Bodenschatz, Heinz-Jörn Moriske, Ulrich Pöschl, Tunga Salthammer, Joachim Curtius, Frank Helleis, Jennifer Niessner, Caroline Herr, Thomas Klimach, Martin Seipp, Thomas Steffens, Christian Witt, Stefan N. Willich
Implications for the academic and interpersonal development of children and adolescents underpin a global political consensus to maintain in-classroom teaching during the ongoing COVID-19 pandemic. In support of this aim, the WHO and UNICEF have called for schools around the globe to be made safer from the risk of COVID-19 transmission. Detailed guidance is needed on how this goal can be successfully
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A global burden assessment of lung cancer attributed to residential radon exposure during 1990–2019 Indoor Air (IF 5.8) Pub Date : 2022-10-24 Xiaobing Shan, Xiaoyu Tian, Bo Wang, Li He, Ling Zhang, Baode Xue, Ce Liu, Ling Zheng, Yunhui Yu, Bin Luo
This study aimed to explore the spatial and temporal trends of lung cancer burden attributable to residential radon exposure at the global, regional, and national levels. Based on the Global Burden of Disease Study (GBD) 2019, we collected the age-standardized mortality rate (ASMR) and age-standardized disability-adjusted life rate (ASDR) of lung cancer attributable to residential radon exposure from
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An evaluation of the risk of airborne transmission of COVID-19 on an inter-city train carriage Indoor Air (IF 5.8) Pub Date : 2022-10-24 Huw Woodward, Rick J. B. de Kreij, Emily S. Kruger, Shiwei Fan, Arvind Tiwari, Sarkawt Hama, Simon Noel, Megan S. Davies Wykes, Prashant Kumar, Paul F. Linden
Experiments were conducted in an UK inter-city train carriage with the aim of evaluating the risk of infection to the SARS-CoV-2 virus via airborne transmission. The experiments included in-service CO2 measurements and the measurement of salt aerosol concentrations released within the carriage. Computational fluid dynamics simulations of the carriage airflow were also used to visualise the airflow
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The effect of air purifiers and curtains on aerosol dispersion and removal in multi-patient hospital rooms Indoor Air (IF 5.8) Pub Date : 2022-10-18 Steven N. Rogak, Adam Rysanek, Jim Myungjik Lee, Surya Venkatesh Dhulipala, Naomi Zimmerman, Martin Wright, Mitch Weimer
Airborne transmission of disease is of concern in many indoor spaces. Here, aerosol dispersion and removal in an unoccupied 4-bed hospital room were characterized using a transient aerosol tracer experiment for 38 experiments covering 4 configurations of air purifiers and 3 configurations of curtains. NaCl particle (mass mean aerodynamic diameter ~3 μm) concentrations were measured around the room
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A systematic approach to quantify the influence of indoor environmental parameters on students' perceptions, responses, and short-term academic performance Indoor Air (IF 5.8) Pub Date : 2022-10-17 Henk W. Brink, Marcel G. L. C. Loomans, Mark P. Mobach, Helianthe S. M. Kort
Several studies found that classrooms' indoor environmental quality (IEQ) can positively influence in-class activities. Understanding and quantifying the combined effect of four indoor environmental parameters, namely indoor air quality and thermal, acoustic, and lighting conditions on people is essential to create an optimal IEQ. Accordingly, a systematic approach was developed to study the effect
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Discussion on regression analysis with small determination coefficient in human-environment researches Indoor Air (IF 5.8) Pub Date : 2022-10-17 Xinbo Xu, Heng Du, Zhiwei Lian
As the main indicator for assessing the explanatory strength of regression model, there is no denying that a bigger value of determination coefficient (R-squared, R2) is the consistent pursuit of researchers in human-environment field, but whether to abandon or apply the model with a small value of R2 is an ongoing argument. This paper summarizes three characteristics of human-environment researches
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Virus transport and infection evaluation in a passenger elevator with a COVID-19 patient Indoor Air (IF 5.8) Pub Date : 2022-10-17 Chengbo Du, Qingyan Chen
Contaminant transport and flow distribution are very important during an elevator ride, as the reduced social distancing may increase the infection rate of airborne diseases such as COVID-19. Studying the airflow and contaminant concentration in an elevator is not straightforward because the flow pattern inside an elevator changes dramatically with passenger movement and frequent door opening. Since
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High time-resolution measurements of ultrafine and fine woodsmoke aerosol number and surface area concentrations in biomass burning kitchens: A case study in Western Kenya Indoor Air (IF 5.8) Pub Date : 2022-10-17 Danielle N. Wagner, Samuel R. Odhiambo, Rose M. Ayikukwei, Brandon E. Boor
Indoor air pollution associated with biomass combustion for cooking remains a significant environmental health challenge in rural regions of sub-Saharan Africa; however, routine monitoring of woodsmoke aerosol concentrations continues to remain sparse. There is a paucity of field data on concentrations of combustion-generated ultrafine particles, which efficiently deposit in the human respiratory system
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Optimized pleat geometry at specific pleat height in pleated filters for air purification Indoor Air (IF 5.8) Pub Date : 2022-10-17 Ye-Lin Kim, Min-Seon Kwon, Myong-Hwa Lee
The performance of an air purifier is determined by its clean air delivery rate (CADR), expressed as the product of the air flowrate and filter collection efficiency. A high CADR in a commercial air purifier is achieved using a pleated air filter with high filtration performance at a given air flowrate. However, obtaining this high filtration performance depends on the knowledge of the manufacturer