M.Tech. (Building Science) / A cross sectional survey was conducted in an air-conditioned building and a naturally ventilated building to establish the prevalence of Sick Building Syndrome (SBS) in these Johannesburg buildings. Numerous studies conducted in other countries have found that the prevalence of SBS symptoms are usually higher in sealed airconditioned buildings than naturally ventilated buildings. The study was conducted in two stages namely a questionnaire and indoor environmental survey which was conducted in both buildings. The results of the questionnaire survey showed that: ' All symptom prevalences in both building populations were very closely related, however the SBS symptoms in building B were more common than air-conditioned building. The indoor environmental survey measured the following parameters: carbon dioxide, carbon monoxide, nitrogen dioxide, nitric oxide, total nitrogen oxides, total non methane hydrocarbons, respirable dust, asbestos, sound levels. No measurements were above any threshold limit values or relevant scientifically acceptable standards, however in the air-conditioned building levels of some pollutants were higher than the naturally ventilated building. The study found that the prevailences of SBS type symptoms in the naturally ventilated building were higher than those in the air-conditioned building. The type of building population could also affect the outcome as has been found by researchers in the United Kingdom. The predominant population in the naturally ventilated building consisted of government employees which could have affected symptom prevalence.

Diss. Linköping : Univ., 2004.

published_or_final_version / Environmental Management / Master / Master of Science in Environmental Management

A research project submitted in partial fulfilment of the requirements for the degree of MA by coursework and Research Report in the field of Organisational Psychology in the Faculty of Humanities. University of the Witwatersrand, Johannesburg. March 2016 / There is international growing evidence to support the notion that indoor planters positively impact employees’ emotional states, personal health, work engagement as well as their overall perceptions of their work environment and ultimately impacting employee productivity. However this ground-breaking research has never been conducted within a South African Work Environment. Consequently the following study adopts a quasi-experimental study in order to investigate the impact that indoor plants may have on employee physical well-being, psychological well-being, work engagement and their overall perception of their work environment. Furthermore, the researcher aimed to assess whether the employees connectedness to nature influenced the impact the plants had on them, thus assessing how this covariate may impact the relationship between the absence and presence of plants and the above mentioned dependent variables. A Sample of 32 Global Service Management Centre (GSMC) employees from an internationally recognised organisation, Business Connexion, were assessed over a period of 12 weeks. The first assessment was conducted in the no plant condition, while the final assessment was conducted once the plants were installed in the whole office area. Additionally, SE Controls were positioned throughout the office area in order to measure the fluctuations of the air quality once the planters were installed. The results of a series of Wilcoxon Sign Rank Tests as well as Spearman’s Rank Order Correlations indicated no significant results; however upon closer evaluations of the individual scale items the researcher identified several statistically significant results that were unpacked and discussed. The readings from the SE Controls indicated either an improvement or stabalisation of the air quality variables that were being assessed in the current study. / GR2017

This thesis deals with methological issues in the study of chemical exposure and sick building syndrome (SBS). SBS is a combination of general, mucosal and skin symptoms that some people experience when staying in specific buildings. The aim was to find chemical patterns associated with SBS, but also to address methological problems in such study. The plan was to conduct a case-control study comparing the two groups’ chemical exposure, where cases were defined as those having at least one general, one mucosal and one skin symptom each week the last three months. For the planning it was necessary to know if cases and controls could be selected from the same building. If everyone in a building have the same chemical exposure it is no use to compare exposure between two persons at the same workplace. In the first paper exposure to more than 100 compounds is compared between 79 participants working in eight buildings. It was found that for the majority of compounds the variation in exposure was larger within buildings than between buildings, which means that cases and controls could be allowed to work in the same building. The second paper is a comparison of three adsorbents usability in finding differences in chemical exposure between SBS cases and controls. This was done by using chemometrical methods but comparisons of sampled amounts, blank values and reproducibility were also done. Tenax TA was found to be the best adsorbent, hence used in the case-control study. In recent years ozone and ozone reaction products with unsaturated volatile organic compounds (VOCs) has been in focus. Nitrogen dioxide is another gas affecting oxidation of reactive VOCs. Formaldehyde is an irritant formed when unsaturated VOCs are oxidised, and in some studies a relation with SBS has been found. In paper three the relation between personal exposure to formaldehyde, nitrogen dioxide, ozone, terpenes and SBS has been investigated among more than 200 office workers in a case control study in Umeå and Vasa. Cases (based on symptoms during the week of measurements) had lower ozone exposure than controls. No further associations were found at present exposure levels. A planed analysis of relations to VOCs could not be done due to analytical problems, and problems due to difficulties with consistent identification of compounds in a very large data set. These problems are further discussed in the thesis. In the case-control, study participants answered questionnaires about symptoms during "the past three months", "right now" (when answering the questionnaire), and during the week of exposure measurements. In the fourth paper the stability of symptoms were compared by answers at different occasions. It was found that the case/control concept was as stable as individual symptoms. More participants with atopic disease and those 41 years old or younger changed class compared with those without atopic disease and older participants. Measurement activities appeared to make participants report more symptoms. Fatigue, dry eyes and dry skin are suggested to be symptoms with strongest, and illness/dizziness to be weakest association with IAQ. / KLUCK-projektet

Hund, bakterieller/ zytologischer Konjunktivalstatus, Konjunktivitis, Klinikaufenthalt

Diss. (sammanfattning) Uppsala : Uppsala universitet, 2005. / Härtill 4 uppsatser.

Diss. (sammanfattning) Linköping : Univ., 2004. / Härtill 6 uppsatser.

Thesis (M. Sc.)--University of Hong Kong, 1996. / Includes bibliographical references (leaf [44-52]).

published_or_final_version / Environmental Management / Master / Master of Science in Environmental Management