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Indoor air quality

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https://www.readbyqxmd.com/read/28726384/lightweight-room-temperature-co2-gas-sensor-based-on-rare-earth-metal-free-composites-an-impedance-study
#1
Christoph Willa, Alexander Schmid, Danick Briand, Jiayin Yuan, Dorota Koziej
We report a light, flexible, and low-power poly(ionic liquid)/alumina composite CO2 sensor. We monitor the direct-current resistance changes as a function of CO2 concentration and relative humidity and demonstrate fast and reversible sensing kinetics. Moreover, on the basis of the alternating-current impedance measurements we propose a sensing mechanism related to proton conduction and gas diffusion. The findings presented herein will promote the development of organic/inorganic composite CO2 gas sensors. In the future, such sensors will be useful for numerous practical applications ranging from indoor air quality control to the monitoring of manufacturing processes...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28710404/assuring-quality-in-microplastic-monitoring-about-the-value-of-clean-air-devices-as-essentials-for-verified-data
#2
Charlotte Wesch, Anna Maria Elert, Manuel Wörner, Ulrike Braun, Roland Klein, Martin Paulus
Avoiding aerial microfibre contamination of environmental samples is essential for reliable analyses when it comes to the detection of ubiquitous microplastics. Almost all laboratories have contamination problems which are largely unavoidable without investments in clean-air devices. Therefore, our study supplies an approach to assess background microfibre contamination of samples in the laboratory under particle-free air conditions. We tested aerial contamination of samples indoor, in a mobile laboratory, within a laboratory fume hood and on a clean bench with particles filtration during the examining process of a fish...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28692913/particle-and-bioaerosol-characteristics-in-a-paediatric-intensive-care-unit
#3
Congrong He, Ian M Mackay, Kay Ramsay, Zhen Liang, Timothy Kidd, Luke D Knibbs, Graham Johnson, Donna McNeale, Rebecca Stockwell, Mark G Coulthard, Debbie A Long, Tara J Williams, Caroline Duchaine, Natalie Smith, Claire Wainwright, Lidia Morawska
The paediatric intensive care unit (PICU) provides care to critically ill neonates, infants and children. These patients are vulnerable and susceptible to the environment surrounding them, yet there is little information available on indoor air quality and factors affecting it within a PICU. To address this gap in knowledge we conducted continuous indoor and outdoor airborne particle concentration measurements over a two-week period at the Royal Children's Hospital PICU in Brisbane, Australia, and we also collected 82 bioaerosol samples to test for the presence of bacterial and viral pathogens...
July 7, 2017: Environment International
https://www.readbyqxmd.com/read/28686964/relative-importance-of-13-correlates-of-child-stunting-in-south-asia-insights-from-nationally-representative-data-from-afghanistan-bangladesh-india-nepal-and-pakistan
#4
Rockli Kim, Iván Mejía-Guevara, Daniel J Corsi, Víctor M Aguayo, S V Subramanian
Optimal growth and development in early childhood is determined by a complex interplay of child, maternal, household, environmental, and socioeconomic factors that influence nutritional intake, but interventions to reduce child undernutrition sometimes target specific risk factors in isolation. In this analysis, we assess the relative importance of 13 correlates of child stunting selected based on a collective review of existing multi-factorial frameworks: complementary feeding, breastfeeding, feeding frequency, dietary diversity, maternal height, body mass index (BMI), education, age at marriage, child vaccination, access to improved drinking source and sanitation facilities, household indoor air quality, and household wealth...
June 16, 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/28683154/real-world-volatile-organic-compound-emission-rates-from-seated-adults-and-children-for-use-in-indoor-air-studies
#5
Christof Stönner, Achim Edtbauer, Jonathan Williams
Human beings emit many volatile organic compounds (VOCs) of both endogenous (internally produced) and exogenous (external source) origin. Here we present real world emission rates of volatile organic compounds from cinema audiences (50-230 people) as a function of time in multiple screenings of three films. The cinema location and film selection allowed high frequency measurement of human emitted VOCs within a room flushed at a known rate so that emissions rates could be calculated for both adults and children...
July 6, 2017: Indoor Air
https://www.readbyqxmd.com/read/28679081/polycyclic-aromatic-hydrocarbons-pah-in-portuguese-educational-settings-a-comparison-between-preschools-and-elementary-schools
#6
Klara Slezakova, Marta Oliveira, Joana Madureira, Eduardo de Oliveira Fernandes, Cristina Delerue-Matos, Simone Morais, Maria do Carmo Pereira
The aim of this study was to determine levels and risks due to inhalation exposure to polycyclic aromatic hydrocarbons (PAH) in different educational settings, namely for 3- to 5- year-old and 6- to 10-year-old children. Eighteen PAH (16 priority designated by US Environmental Protection Agency (USEPA) and dibenzo[a,l]pyrene and benzo[j]fluoranthene) were simultaneously collected in indoor and outdoor air at two Portuguese preschools (PS1-PS2) and five elementary schools (ES1-ES5) from March to May 2014. Indoor concentrations at PS and ES were significantly different, with total levels (∑PAHs) 0...
July 5, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28679072/long-term-associations-of-morbidity-with-air-pollution-a-catalogue-and-synthesis
#7
Frederick W Lipfert
I searched the NIH Medline database through January 2017 for long-term studies of morbidity and air pollution and cataloged them with respect to cardiovascular, respiratory, cancer, diabetes, hospitalization, neurological, and pregnancy-birth endpoints. The catalogue is presented as an online appendix. Associations with PM2.5, PM10, and NO2 were evaluated most frequently among the 417 ambient air quality studies identified. Associations with TSP, carbon, ozone, sulfur, vehicular traffic, radon, and indoor air quality were also reported...
July 5, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28660425/the-fate-of-mengovirus-on-fiberglass-filter-of-air-handling-units
#8
Victor Bandaly, Aurélie Joubert, Pierre Le Cann, Yves Andres
One of the most important topics that occupy public health problems is the air quality. That is the reason why mechanical ventilation and air handling units (AHU) were imposed by the different governments in the collective or individual buildings. Many buildings create an artificial climate using heating, ventilation, and air-conditioning systems. Among the existing aerosols in the indoor air, we can distinguish the bioaerosol with biological nature such as bacteria, viruses, and fungi. Respiratory viral infections are a major public health issue because they are usually highly infective...
June 28, 2017: Food and Environmental Virology
https://www.readbyqxmd.com/read/28659624/alcohol-recognition-by-flexible-transparent-and-highly-sensitive-graphene-based-thin-film-sensors
#9
Xuezhu Xu, Jian Zhou, Yangyang Xin, Gilles Lubineau, Qian Ma, Long Jiang
Chemical sensors detect a variety of chemicals across numerous fields, such as automobile, aerospace, safety, indoor air quality, environmental control, food, industrial production and medicine. We successfully assemble an alcohol-sensing device comprising a thin-film sensor made of graphene nanosheets (GNs) and bacterial cellulose nanofibers (BCNs). We show that the GN/BCN sensor has a high selectivity to ethanol by distinguishing liquid-phase or vapor-phase ethanol (C2H6O) from water (H2O) intelligently with accurate transformation into electrical signals in devices...
June 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28656559/assessing-indoor-air-quality-of-school-environments-transplanted-lichen-pseudovernia-furfuracea-as-a-new-tool-for-biomonitoring-and-bioaccumulation
#10
Carmela Protano, Malgorzata Owczarek, Arianna Antonucci, Maurizio Guidotti, Matteo Vitali
The aim of this research is to evaluate the ability of transplanted lichen Pseudovernia (P). furfuracea to biomonitor and bioaccumulate in urban indoor environments. The elements As, Cd, Cr, Cu, Hg, Ni and Pb and 12 selected polycyclic aromatic hydrocarbons (PAHs) were used to assess P. furfuracea as a biomonitoring tool for the indoor air quality of school environments. To achieve this purpose, lichen samples were exposed for 2 months in the outdoor and indoor environments of five school settings located in urban and rural areas...
July 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28653154/dna-persistence-of-bite-marks-on-food-and-its-relevance-for-str-typing
#11
Céline M Pfeifer, Anja Gass, Rachel Klein-Unseld, Peter Wiegand
In forensic DNA analysis, salivary traces at crime scenes are a promising way to identify a person. However, crime scenes are oftentimes investigated a while after the crime and recovered samples might have been degraded leading to poor PCR amplification. Probably due to decomposition and negative visual impression of spoiled food, bite mark samples make up only a small part of our casework routine. In this study, bite marks on apples and chocolate bars as well as on an inert surface (microscope slide) were stored up to 3 weeks indoors and outdoors during different seasons and analyzed for amylase activity and DNA quantity and quality...
June 26, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28651166/air-quality-inside-subway-metro-indoor-environment-worldwide-a-review
#12
REVIEW
Bin Xu, Jinliang Hao
The air quality in the subway metro indoor microenvironment has been of particular public concern. With specific reference to the growing demand of green transportation and sustainable development, subway metro systems have been rapidly developed worldwide in last decades. The number of metro commuters has continuously increased over recent years in metropolitan cities. In some cities, metro system has become the primary public transportation mode. Although commuters typically spend only 30-40min in metros, the air pollutants emitted from various interior components of metro system as well as air pollutants carried by ventilation supply air are significant sources of harmful air pollutants that could lead to unhealthy human exposure...
June 23, 2017: Environment International
https://www.readbyqxmd.com/read/28645052/cardiorespiratory-responses-of-air-filtration-a-randomized-crossover-intervention-trial-in-seniors-living-in-beijing-beijing-indoor-air-purifier-study-biapsy
#13
Danqing Shao, Yipeng Du, Shuo Liu, Bert Brunekreef, Kees Meliefste, Qian Zhao, Jie Chen, Xiaoming Song, Meng Wang, Juan Wang, Hongbing Xu, Rongshan Wu, Tong Wang, Baihuan Feng, Candice Shih-Chun Lung, Xian Wang, Bei He, Wei Huang
In this Beijing Indoor Air Purifier StudY (BIAPSY), we conducted a randomized crossover intervention trial in a panel of 35 non-smoking senior participants with free-living, with and without chronic obstructive pulmonary disease (COPD). Portable air filtration units were randomly allocated to active-(filter in) for 2weeks and sham-mode (filter out) for 2weeks in the households. We examined the differences in indoor air pollutant concentrations in 20 study homes and a suite of cardio-respiratory biomarker levels in study participants between filtration modes, with and without adjustment for potential confounders...
June 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28626790/data-on-records-of-indoor-temperature-and-relative-humidity-in-a-university-building
#14
O Irulegi, A Serra, R Hernández
Good indoor comfort and air quality are essential for correct educational development. Most reports in this field focus on primary and secondary school buildings, with numerous projects conducted in the Mediterranean Zone. However, little has been done in the context of university buildings. Data on indoor temperature and relative humidity data acquired trough field surveys of a seminar room located in the Architecture Faculty in San Sebastian (Spain) is provided in this paper. The seminar room was monitored during a typical spring week...
August 2017: Data in Brief
https://www.readbyqxmd.com/read/28609222/thoracic-and-respirable-aerosol-fractions-of-spray-products-containing-non-volatile-compounds
#15
Katharina Schwarz, Wolfgang Koch
A versatile and simple mass balance method for the measurement of the release fraction of thoracic and respirable particles of non-volatile compounds of spray products is presented. The release fractions are defined as the ratio between the mass of suspended non-volatile particulate matter in the thoracic, respectively, respirable particle size range and the total mass of non-volatile material released with the spray action. For its determination, a spray bolus of short duration and of defined mass is sprayed into a well stirred control chamber...
June 13, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28600748/teacher-respiratory-health-symptoms-in-relation-to-school-and-home-environment
#16
Shao Lin, Wayne R Lawrence, Ziqiang Lin, Melissa Francois, Iulia A Neamtiu, Qiaoxuan Lin, Eva Csobod, Eugen S Gurzau
PURPOSE: Few studies have evaluated teachers' respiratory health, especially its relationship with school/home environment, and school policies. This study assessed asthma and smoking prevalence among teachers in Romania, teacher's perception and knowledge of the school environment, policies and asthma management, and how school and home environment affected asthma, allergy, and respiratory infection symptoms. METHODS: This cross-sectional study obtained information from 104 Romanian teachers utilizing teacher questionnaire data for Romania only, as part of the Schools Indoor Pollution and Health: Observatory Network in Europe (SINPHONIE) study, a multicenter European research project conducted between 2010 and 2012...
June 9, 2017: International Archives of Occupational and Environmental Health
https://www.readbyqxmd.com/read/28592396/prevalence-of-and-risk-factors-for-childhood-asthma-rhinitis-and-eczema-in-hong-kong-proposal-for-a-cross-sectional-survey
#17
So Lun Lee, Yu Lung Lau, Hing Sang Wong, Linwei Tian
BACKGROUND: Previous studies have shown that particulate matter is a major problem in indoor air quality in Hong Kong schools, but little has been done to assess its relationship with health indicators in the children attending those schools. Our study aims to address this research gap by collecting aerosol data in schools to examine the link between different air pollutants with childhood respiratory health. It is important to explore whether or not the prevalence of asthma, allergic rhinoconjunctivitis, and eczema are increasing in local children...
June 7, 2017: JMIR Research Protocols
https://www.readbyqxmd.com/read/28590436/volatile-organic-compounds-in-anatomical-pathology-wards-comparative-and-qualitative-assessment-of-indoor-airborne-pollution
#18
Massimo Cipolla, Alberto Izzotti, Filippo Ansaldi, Paolo Durando, Maria Teresa Piccardo
The impact of volatile organic compounds (VOCs) on indoor air quality and on human health is widely recognized. However, VOC contamination in hospital indoor air is rarely studied and chemical compounds that singularly do not show high toxicity are not submitted to any regulation. This study aimed to compare VOC contamination in two different anatomical pathology wards in the same hospital. Hydrocarbons, alcohols, and terpenes were sampled by passive diffusive samplers. Analytical tests were performed by thermal desorption coupled with gas chromatography and mass spectrometry detector...
June 7, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28574753/diurnal-and-seasonal-variations-of-odor-and-gas-emissions-from-a-naturally-ventilated-free-stall-dairy-barn-on-the-canadian-prairies
#19
Dandan Huang, Huiqing Guo
This study characterized the seasonal concentration (C) and emission (E) patterns of odor, ammonia (NH3), and hydrogen sulfide (H2S) over the course of a whole year and their diurnal patterns in cold, warm, and mild seasons for a naturally ventilated free-stall dairy barn. It was found that seasonal odor, NH3, and H2S emissions varied greatly: from 17.2 to 84.4 OU s(-1) AU(-1) (Animal Unit, 500 kg of animal body mass), from 0.27 to 0.92 mg s(-1) AU(-1), and from 3 to 105 μg s(-1) AU(-1), respectively. The overall concentrations of odor and NH3 were higher in the winter, whereas the emissions were higher in the mild and warm seasons...
June 2, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28573443/indoor-exposure-to-volatile-organic-compounds-in-children-health-risk-assessment-in-the-context-of-physiological-development
#20
Radoslaw Czernych, Artur J Badyda, Grazyna Gałęzowska, Lidia Wolska, Pawel Zagożdżon
Indoor air quality is strongly affected by the contamination of ambient air and that related to building and finishing materials and to human activity. Poor ventilation of closed spaces facilitates retention of greater quantity of pollutants. Infants and children are at particular risk of exposure to indoor air pollutants as they undergo rapid physiological and biochemical changes and demonstrate activity patterns unlike those in adults. Health risk assessment in children should be carried out with regard to children-specific factors, since these factors may constitute a source of errors...
June 2, 2017: Advances in Experimental Medicine and Biology
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