The contribution of new and used fine bagfilters to indoor air pollution has been determined in a laboratory study by a trained panel as well as by TVOC measurements. The used filters were all taken out of air handling systems which run with full outdoor air supply. The time that a used filter had been situated in the ventilation system until it was taken out and was studied in the laboratory varied from two to ten months. The new filters did not pollute significantly in comparison to the used filters. However, all used filters polluted the air instead of cleaning it.
Garages require ventilation because the exhaust fumes produced by the vehicles have to be discharged. This can be achieved with a mechanical or a natural ventilation system. A natural ventilation system has several important advantages compared w
This paper deals with the problem of exhaust cross-contamination between vehicles in a slow-moving traffic queue, as would be found in a busy modern city. This study has been undertaken using an open-jet wind tunnel, to determine the level of exhaust contamination around a 1:10 scale model car under various prevailing wind conditions. Tracer-gas techniques have been combined with static pressure measurements, to model the flow of pollutants around a vehicle body.
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