According to the World Health Organisation (WHO), indoor air pollution is the eighth health risk factor and is responsible for 2.7% of the world's illnesses. The purpose of this study is to carry out a quantitative survey of non-biological pollutants, specifically CO2, and biological agents, specifically fungi, and compare the results with the parameters established by Conama Resolution - RE 09/2003. For this assessment, the research was carried out in an administrative office located in the centre of Curitiba. The methodology applied consisted of carrying out laboratory analyses on the air conditioning filters and collecting indoor air in two different climatic seasons, then comparing the results with the legislation in force in Brazil, currently governed by Resolution RE 09/2003. It is hoped that this study will contribute to understanding the behaviour of these pollutants and also provoke critical reflection on the exposure of workers around the world in artificially refrigerated environments to the invisible risks that cause countless diseases.