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Indoor air quality, an important factor influencing human health and well being, is mainly assessed
on the basis of thermal and chemical parameters as well as aerosol concentration. Another
important factor occurs to be radon 222Rn. Concentration of this invisible, odorless radioactive gas
and its radioactive solid decay products can have a significant impact on premises users’ health.
There is a lot of information about radon levels in different premises worldwide. In this study, the
analysis of indoor air parameters and aerosol concentration impact on radon and its decay product
concentrations were performed. Measurements were undertaken in air-conditioned auditorium of
Environmental Engineering Department, Lublin University of Technology, Lublin, Poland. Indoor
air temperature, its humidity and aerosols concentration were monitored for four weeks. It was
found that radon gas concentration and its decay products are dependent on thermal parameters,
aerosol concentration, students attendance and air exchange rate.
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