Asbestos exposure limit reduced.


The epidemiology of indoor air problems.

Discusses sick building syndrome in office buildings. Poor ventilation is frequently blamed, although in 60% of cases, no specific cause can be identified, because of symptoms which are non-specific, and the vast variety of substances present in the air. Similarly, factors contributing to disease are not restricted to pollutant levels only. Procedure for examining causes of sick building syndrome are suggested. Describes checking of different kinds of ventilation system, and the importance of outside air intake. Describes problems of both local and central ventilation systems.

Indoor air quality in cold climates: hazards and abatement measures.

Summary of an APCA International Speciality Conference. Contains information on some relatively unfamiliar trace gases and fungi, as well as on the better known indoor air pollutants. Studies range from those on human health tothose concentrating on pollutant emissions to those addressing building ventilation. Papers also cover sick building syndrome and pollutant and ventilation surveys.

Ventilation strategies and occupants' behaviour.

Each occupant in a room should be able to control his own indoor environment. Individual control can be achieved in many ways: from simple window-opening to automatically arranged personal mini-environment. Individual control is not utilized effectively today. This is partly caused by lack of proper information, and partly by the fact that builders pay more attention to construction than to use and operation. Even technically complicated systems can be easy to operate - what is needed is sufficient, but not too difficult user information.

Natural ventilation in large and multicelled buildings: theory, measurement and prediction.

In this programme of work, methodologies for determining infiltration rates of large and complex buildings have been established. Theoretical considerations suggested that comprehensive information regarding interzonal air movements might be obtained from experimental techniques using multiple tracer gases. Field measurements to determine interzonal flows were carried out in office buildings using automated measurement systems developed for this purpose. Simpler techniques were found to be needed and were developed.

Demand efficient ventilation systems! Stall krav pa effektiva ventilations system!

Ventilation systems perform a number of tasks. They must remove contamination/pollution, they act as heat/cold transporters and they must create a satisfactory room climate without causing draughts. States that users must be aware of the limitations of ventilation systems and that ventilation systems are not able to carry out all tasks completely satisfactorily. Compares the efficiencies of displacement and mixing systems and gives guide values for temperature differences between room air and supply air for office and industrial applications.