Finding F-0497

“In absolute CO2 values, the maximum average was 835 ± 232 ppm, reaching a maximum value of 1229 ppm.”

Baselga et al. The Control of Metabolic CO2 in Public Transport as a Strategy to Reduce the Transmission of Respiratory Infectious Diseases (2022). International journal of environmental research and public health. Page 7. CKB 8615

Structure

Factor: Carbon dioxide (CO₂)
Population: tram passengers
Setting: tram, ES
Study design: CO2 monitoring with eight sensors distributed in a tram of the Zaragoza (Spain) tramway over 88 round trips (more than 79,200 records), with an outdoor reference sensor, tram occupancy and HVAC settings recorded; ppm per person proposed as an indicator (class 4)
Effect: mean 835
Averaging time: average over one round trip
Caveat: the ± value is not named in the sentence

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.