We have investigated the effect of UVC on IAQ in a ventilation plant in a typical office building. The UVC-system consisted of UVC-lights for irradiation on all central components in the air handling unit. A similar ventilation plant, but without UVC, was chosen as a reference plant. Microorganisms on surfaces, living airborne mould spores and MVOC (Microbial Volatile Organic Compounds) were sampled throughout the ventilation plant and in corresponding rooms before and after UVC-irradiation. In addition, parallel measurements in the reference plant were conducted.
The objective of this study has been to clarify to what extent ozone (O3) and O3 /limonene in interaction with surface materials has an impact on the indoor air quality in typical low-polluting offices at realistic outdoor air change rates. Three similar offices furnished with the same materials and ventilated with charcoal filtered outdoor air were used in the study. Eight environmental conditions with different realistic combinations of air change rate, O3 and limonene levels were studied.
The effect on Indoor Air quality of painting at home has been debated. This paper presents a case study where a normal Scandinavian two-bedroom apartment has been refurnished with new paint on the walls and ceilings and the VOC emissions have been measured during eight weeks. Low-emitting wall and ceiling paint was selected for the study and a paint shop rolled two layers of new paint on the walls and ceilings in two rooms. Parallell the paints were applied to glass plates according to the Scandinavian trade standard and investigated with the FLEC method in the laboratory.
This article shows results of air quality measurements (airborne moulds, microbes and particles) operated in summer and winter in an hospital in Japan.
The development of indoor air quality was studied in three newly finished buildings in Helsinki, Finland during the years 2000-2002. The concentration of volatile organic compounds (VOC), formaldehyde and ammonia, for which the Finnish Classification of Indoor Climate 2000 gives target values, in indoor air as well as the air exchange rate, relative humidity and temperature were determined for the newly finished buildings and 6- 12 months after the buildings had been taken in use.
The investigation was made in a Finnish building built for people with respiratory diseases. During 3 years the main indoor air parameters were measured. In parallel a questionnaire to evaluate symptoms of the occupants and their satisfaction was conducted.The experiment proved that the use of low emitting building materials, along with a high quality control of the building practices during the contruction phases, gave full satisfaction to the occupants (decrease of their symptoms during the 3 year-occupancy).With low additional costs a high IAQ can be obtained.
The impact of the concentration of pollutants in the air on emissions from building materials is the subject of that study.Different building materials were studied in ventilated small-scale test chambers. The experiment allowed the changing of the dilution factor or the changing of the area factor.The results showed that more ventilation in a given space may increase the emissions from the inner surfaces.
A good indoor air quality is necessary to minimize exposure to airborne pollutants. The main source of those pollutants is often outdoor air. Ventilation and air filtration are the main solutions to reduce them.The aim of that study was to investigate the effects of air ventilation and filtration on submicrometer particle concentrations indoors thanks to a simple one zone mathematical model that simulates the time evolution of particle concentrations indoors.
In France, air quality in working areas is a matter of preoccupation for both the industry and the welfare state, that is in charge with the application of the rules and regulations in that field. The Labour Legislation and the Institution of Prevention, bring advice and assistance to the companies and final users.20 practical guides dealing with ventilation are listed at the end of the article.
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