Finding F-1248

“Similar to TVOCs, higher CO2 levels (1.1–1.4 times) were observed in group class studios (i.e., smaller room areas), with medians of 1,043 mg/m3 in HC1 and 2,538 mg/m3 in HC7, than in C&B areas (936 mg/m3 in HC6–1,866 mg/m3 in HC7).”

Peixoto Assessment of indoor air quality in health clubs: insights into (ultra)fine and coarse particles and gaseous pollutants (2023). Frontiers in public health. Page 8. CKB 5760

Structure

Factor: Carbon dioxide (CO₂)
Population: users and staff of health clubs
Setting: health club (group class studio), PT
Study design: measurement campaign in eight health clubs in Porto, Portugal, under the occupancy and ventilation restrictions of the pandemic period: particulate matter as PM10 and PM2.5, particle number concentration between 20 and 1000 nanometres, total volatile organic compounds, carbon dioxide, ozone, temperature and relative humidity measured during occupied periods in the cardiofitness and bodybuilding areas and in the group class studios (class 4)
Effect: median 2,538
Caveat: medians of individual clubs, not of the whole sample; the study attributes the difference to the smaller room volumes of the studios

A Finding records what one published document states, verbatim and with its page. It is not a conclusion of Coridum; see the Claims that build on it.