Indoor Air Quality in Fitness Centers with/without the Restrictions of COVID-19

After the lockdown due to COVID-19, the sports facilities were subjected to specific public health rules, namely in terms of the type of ventilation, hygiene and sanitation and restrictions for occupancy. This study aimed to evaluate the impact of public health restrictions on levels of gaseous pollutants (CO2 and total volatile organic compounds—TVOCs) and comfort parameters (temperature—T, relative humidity—RH) in the indoor air of fitness centres. Indoor air sampling (CO2, TVOCs, and comfort parameters) were continuously (24 h) monitored (Graywolf probe) in five fitness clubs (Oporto Metropolitan Area, Portugal) for 10–12 days under two scenarios—during and after the period with specific public health restrictions. The results showed that the implemented restrictions have affected all parameters. Occupancy-level limitations resulted in reduced CO2 (1.1–2.6 times) and RH (0.97–1.4 times). On the contrary, requirements for cleaning and frequent use of cleaning products and disinfectants led to increased (1.0–2.2 times) TVOCs. Finally, the prohibited use of air conditioning resulted in difficulties maintaining temperatures within the recommended values. In general, the restrictive measures to control COVID-19 have significantly changed indoor environmental quality of fitness centres. Further studies about air quality occupants related indicators are required.