journal
https://read.qxmd.com/read/36567523/contactless-sleep-posture-measurements-for-demand-controlled-sleep-thermal-comfort-a-pilot-study
#1
JOURNAL ARTICLE
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 comfort needs of human sleep, and improve human sleep quality and health. Based on 438 valid questionnaire surveys, 10 types of thermal comfort sleep postures were summarized...
December 2022: Indoor Air
https://read.qxmd.com/read/36567522/human-thermal-sensation-and-its-algorithmic-modelization-under-dynamic-environmental-thermal-characteristics-of-vehicle-cabin
#2
JOURNAL ARTICLE
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 showed that the head, chest, back, and hands during hot exposure are warmer leading to the overall thermal sensation being hot...
December 2022: Indoor Air
https://read.qxmd.com/read/36567521/indoor-pm-2-5-from-occupied-residences-in-sweden-caused-higher-inflammation-in-mice-compared-to-outdoor-pm-2-5
#3
JOURNAL ARTICLE
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 outdoor separately), and characterized for chemical composition and endotoxins before being tested for toxicity in mice via intratracheal instillation...
December 2022: Indoor Air
https://read.qxmd.com/read/36437680/personal-comfort-models-based-on-a-6-month-experiment-using-environmental-parameters-and-data-from-wearables
#4
JOURNAL ARTICLE
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 than 1080 field-based surveys per participant. Surveys were matched with environmental and physiological measured variables collected indoors in their homes and offices...
November 2022: Indoor Air
https://read.qxmd.com/read/36437679/impact-of-do-it-yourself-air-cleaner-design-on-the-reduction-of-simulated-wildfire-smoke-in-a-controlled-chamber-environment
#5
JOURNAL ARTICLE
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 DIY air cleaner designs for reducing simulated wildfire smoke and identify operating parameters that may impact their performance and use...
November 2022: Indoor Air
https://read.qxmd.com/read/36437678/a-longitudinal-study-on-the-effects-of-hygro-thermal-conditions-and-indoor-air-pollutants-on-building-related-symptoms-in-office-buildings
#6
JOURNAL ARTICLE
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 and carbon dioxide and sampling was performed for indoor air pollutants. Questionnaires were concurrently administered to collect information on participants' perceptions of their comfort and health and the conditions of the work environments...
November 2022: Indoor Air
https://read.qxmd.com/read/36437677/the-impact-of-ventilation-rate-on-reducing-the-microorganisms-load-in-the-air-and-on-surfaces-in-a-room-sized-chamber
#7
JOURNAL ARTICLE
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 the infection risk. We developed and validated a novel Automated Multiplate Passive Air Sampling (AMPAS) device...
November 2022: Indoor Air
https://read.qxmd.com/read/36437676/air-concentrations-of-volatile-organic-compounds-associated-with-conventional-and-green-cleaning-products-in-real-world-and-laboratory-settings
#8
JOURNAL ARTICLE
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 of concern released from conventional and "green" cleaning products during both real-world household cleaning and a controlled chamber environment, with a focus on chemicals that might increase women's risk of breast cancer, including possible carcinogens, reproductive/developmental toxicants, or endocrine disruptors...
November 2022: Indoor Air
https://read.qxmd.com/read/36437675/trimester-specific-association-of-perceived-indoor-air-quality-with-antenatal-depression-china-medical-university-birth-cohort-study
#9
JOURNAL ARTICLE
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. A total of 2166 pregnant women were enrolled during the first trimester and evaluated during the second and third trimesters in the China Medical University Birth Cohort Study, a prospective pre-birth cohort study in northeastern China...
November 2022: Indoor Air
https://read.qxmd.com/read/36437674/polybrominated-diphenyl-ethers-and-polycyclic-aromatic-hydrocarbons-in-dust-from-different-indoor-environments-in-zagreb-croatia-levels-and-human-exposure-assessment
#10
JOURNAL ARTICLE
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, <LOD-313.75, and 0.6-5666.98 ng g-1 dust, while ΣPAHs were 244.9-833.0, 230.5-5632.7, and 395.6-12114.8 ng g-1 dust in kindergartens, workplaces, and cars, respectively. In the central case scenario, dust from homes contributed to the intake of PBDEs and PAHs the most, while for PBDEs in the worst-case scenario, the intake through car dust prevailed...
November 2022: Indoor Air
https://read.qxmd.com/read/36437673/modeling-the-effect-of-temperature-and-relative-humidity-on-exposure-to-sars-cov-2-in-a-mechanically-ventilated-room
#11
JOURNAL ARTICLE
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 evaporation is an important effect. Evaporation leads to respiratory particles, particularly those with initial diameters between 20 and 100 μm, remaining airborne for longer, traveling extended distances and carrying more viruses than expected from their final diameter...
November 2022: Indoor Air
https://read.qxmd.com/read/36437672/sweet-foods-dietary-pattern-enhances-negative-associations-of-perceived-indoor-air-quality-during-pregnancy-with-postpartum-depression
#12
JOURNAL ARTICLE
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 indoor air quality. Women with higher PIAQ scores were at increased risk for PPD (tertile 3 vs. tertile 1, odds ratio [OR] = 2...
November 2022: Indoor Air
https://read.qxmd.com/read/36437671/combining-phi6-as-a-surrogate-virus-and-computational-large-eddy-simulations-to-study-airborne-transmission-of-sars-cov-2-in-a-restaurant
#13
JOURNAL ARTICLE
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. Three risk-reduction strategies were studied: (1) augmenting ventilation with air purifiers, (2) spatial partitioning with dividers, and (3) combination of 1 and 2...
November 2022: Indoor Air
https://read.qxmd.com/read/36437670/characterization-of-fine-particulate-matter-from-indoor-cooking-with-solid-biomass-fuels
#14
JOURNAL ARTICLE
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 exposure assessments. Using on- and offline measurement techniques, particulate matter (PM) from the most commonly used solid biomass fuels (charcoal, wood, dung, and crops residue) was characterized in laboratory settings using a way of burning the fuels and an air exchange rate that is representative of real-world settings in low-income countries...
November 2022: Indoor Air
https://read.qxmd.com/read/36437669/a-review-of-critical-residential-buildings-parameters-and-activities-when-investigating-indoor-air-quality-and-pollutants
#15
JOURNAL ARTICLE
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, and the magnitude of exposures. The aim of this review was to investigate and describe the parameters that affect IAQ in residential dwellings: building location, layout, and ventilation, finishing materials, occupant activities, and occupant demography...
November 2022: Indoor Air
https://read.qxmd.com/read/36437668/short-versus-long-term-tests-of-indoor-radon-for-risk-assessment-by-monte-carlo-method-towards-effective-measurement-strategy
#16
JOURNAL ARTICLE
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. This study quantifies the uncertainty of collective risks obtained independently through short- and long-term measurements under the same conditions using the Monte Carlo method that takes into account the number of measurements, as well as the diversity of the spatial distribution of radon concentrations in representative samples of buildings...
November 2022: Indoor Air
https://read.qxmd.com/read/36437667/high-rise-residential-building-ventilation-in-cold-climates-a-review-of-ventilation-system-types-and-their-impact-on-measured-building-performance
#17
REVIEW
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 the three pillars of sustainability: economic (capital and operational cost), social (airflow control, indoor environmental quality, and occupant behavior and interactions), and ecological (energy and carbon)...
November 2022: Indoor Air
https://read.qxmd.com/read/36437666/experimental-study-of-the-negative-effects-of-raised-bedroom-temperature-and-reduced-ventilation-on-the-sleep-quality-of-elderly-subjects
#18
JOURNAL ARTICLE
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 bedrooms. Their electroencephalogram, electrooculogram, chin electromyogram, electrocardiogram, respiration, oxygen saturation, and wrist skin temperature were measured continuously during sleep...
November 2022: Indoor Air
https://read.qxmd.com/read/36437665/health-effects-of-exposure-to-sulfur-dioxide-nitrogen-dioxide-ozone-and-carbon-monoxide-between-1980-and-2019-a-systematic-review-and-meta-analysis
#19
REVIEW
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 studies. After collecting literature published between 1980 and 2019, a total of 19 health outcomes in 101 studies with 182 health risk estimates were recruited...
November 2022: Indoor Air
https://read.qxmd.com/read/36437664/numerical-modeling-of-sneeze-airflow-and-its-validation-with-an-experimental-dataset
#20
JOURNAL ARTICLE
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, and these were used to explore the boundary conditions to reproduce the sneeze airflow. As a result of the sneeze airflow reproduced by computational fluid dynamics simulation, the magnitude ranges of maximum velocity at the interface were observed to be 21...
November 2022: Indoor Air
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