Finding F-1021

“Although mean indoor CO concentrations (1.07 ± 0.31 mg/m3) were statistically significantly higher than outdoors (0.18 ± 0.26 mg/m3) (z = −4.02, p < .001), the measured levels complied with both WHO and existing national guidelines, which establish a maximum limit of 10 mg/m3 (Portaria n.o 353-A/2013; WHO 2010).”

Felgueiras Comprehensive assessment of the indoor air quality in a chlorinated Olympic-size swimming pool (2020). Environment international. Page 5. CKB 0033

Structure

Factor: Carbon monoxide (CO)
Setting: indoor swimming pool hall, PT
Study design: comprehensive indoor air quality assessment in a chlorinated Olympic-size swimming pool: trihalomethanes, volatile organic compounds, carbon monoxide, carbon dioxide, particles and ultrafine particle counts measured indoors and outdoors (class 4)
Effect: mean 1.07
Caveat: the authors read carbon monoxide and the non-trihalomethane volatile compounds as having a common source

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.