The objective of the present study is to apply and test a mathematical model for thedetermination of the strength of various indoor sources of ultra-fine particles (UFP), and thesink effect for such particles. The model is intended for further development in order to createa tool capable of predicting the concentrations of fine and ultra-fine particles in a room. Inputdata to the model are the ventilation rate, emission rates of ultra-fine particles from differentindoor sources and properties describing sink effects. Laboratory measurements of 10 indoorsources (e.g.
The relationship between indoor and outdoor concentration levels of particles in the absenceand in the presence of indoor sources has been attracting an increasing level of attention.Understanding of the relationship and the mechanisms driving it, as well as the ability toquantify it, are of importance for assessment of source contribution, assessment of humanexposure and for control and management of particles.
In a small case study involving an office room and a laboratory in a building equipped with aHVAC system VOC and particle samples were collected. Both rooms used for theexperiments were newly renovated and low, but measurable amounts of typical indoor VOCand SVOC were present in the air several weeks after finishing of the renovation work. TheVOC concentrations decreased slowly during the test period of 3 weeks.Particulate matter in the room air was characterized regarding the size distribution bySMPS.
The concentrations of ultra fine particles (UFPs) were measured in the medium-size city ofGothenburg, Sweden, in the large city of Copenhagen and at a rural site in Denmark. InGothenburg, field measurements were conducted both in several residential and officebuildings, while in Denmark measurements comprise two office buildings, one of themlocated at a rural site. Concentrations of UFPs were measured simultaneously indoors andoutdoors.
A cubic experimental chamber with 2.5m of sides was designed to measure the impact of the ventilation on particle concentration. Particles of 0.3 - 15µm diameter were used. Two ventilation parameters were studied: the ventilation rate (0.5 and 1.0 ach) an
Penetration of inert particles with a size range from 0.6 to 4 µm and spores of Penicillium and Cladosporium was studied through a full scale timber structure. Pressure difference and air leakage over the structure were varied. Measurements at moderate pr
A study on pollutant dispersion and distribution inside public taxi transfer interchanges (TTIs)is reported. The pollutant levels inside TTIs are affected by many factors, for example, taxidata, climatic conditions, human activities and geometrical layout of TTIs. A sitemeasurement of respirable suspended particulate (RSP) level is carried out in a typical TTI inHong Kong. After analysing the effect of the above factors on RSP level, we propose to useartificial neural networks (ANNs) to study such phenomena.
In this study, we attempt to investigate the level of indoor air pollution and to evaluate itshealth effects on the subjects exposed to pollution in Beijing. About 270 households (90 perdistrict) were selected randomly from three districts (90 per district), representing theindustrial, old downtown and cultural/educational areas of Beijing. The concentrations ofPM10, PM2.5 and SO2 in indoor air were measured in the bedroom and the kitchen of thesubjects homes.
There is increasing evidence of a causal link between airborne particles and ill health and thisstudy monitored the exposure to both airborne particles and the gas phase contaminants ofenvironmental tobacco smoke (ETS) in a nightclub.The present study followed a number of pilot studies in which the human exposure toairborne particles in a nightclub was assessed and the spatio-temporal distribution of gas phasepollutants was evaluated in restaurants and pubs.
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