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To stay healthy, people frequent sports facilities. This work aimed to evaluate air pollution and comfort parameters in a fitness club in the post lockdown period (due to the COVID-19 pandemic), focusing on particulate material (PM10, PM2.5) and gaseous pollutants (total volatile organic compounds -TVOCs, carbon dioxide - CO2, and carbon monoxide – CO). Sampling was carried out for 10 consecutive days in October 2020 in one fitness center (Oporto, Portugal). The results showed that indoor PM10 ranged from 1.4 to 122.5 µg/m3 and PM2.5 was between 0.8 and 25 µg/m3; the overall levels were in accordance with the current legislation. TVOC means were 0.39 mg/m3 when not occupied and 0.43 mg/m3 when exercising subjects were present, thus also fulfilling the limit 0.6 mg/m3). Average CO2 was 1400 mg/m3 with temporal maxima (2660-2894 mg/m3) exceeding the protection threshold. Finally, temperature and relative humidity exceeded the recommended comfort levels, especially during group activity classes.
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