Indoor-Outdoor atmospheric particulate matter relationships in naturally ventilated offices

The aim of this paper was to investigate during working hours, atmospheric particle size distribution and number concentrations in three naturally ventilated offices and outdoors to study the indoor-outdoor atmospheric particulate matter relationships. It appears that construction activities in the vicinity, movement of people indoors, computer operation, environmental tobacco smoke, re-suspension, and meteorological conditions with respect to office orientation have a significant impact on indoor PM number concentrations.