ABSTRACT
ABSTRACT: The results presented in this paper deal with the effects of thermal conditions on the aerosol particle number concentration in a lecture room. The influence of naturally changed indoor air temperature and humidity on particle concentration was examined. Measurements of particle number concentrations and thermal conditions were performed in a vacant lecture room and then again when the students were present. The obtained results suggest that indoor air thermal parameters, except occupancy and outdoor concentration of particles, could influence the number concentration of aerosol particles in the lecture room. The presence of students caused an enormous increase in coarse particles (>5 µm) and a significant decrease of small particles (<5 µm). These changes could have implications for students exposed to aerosol particles. There are possible associated health consequences, especially when these particles are potentially hazardous.
