Finding F-0689

“NO2 concentrations were, on average, 1.8 times higher [95% confidence interval (CI), 1.6–2.1] and formaldehyde concentrations were, on average, 9.4 ppb higher (95% CI, 5.7–13.1) dur ing exposure to unflued gas versus flued gas heaters.”

Respiratory Health Effects of Exposure to Low-NOx Unflued Gas Heaters in the Classroom: A Double-Blind, Cluster-Randomized, Crossover Study (2010). Environmental health perspectives. Page 1. CKB 6702

Structure

Source: Unvented heaters
Factor: Nitrogen dioxide (NO₂)
Population: school children
Setting: classroom, AU
Study design: double-blind, cluster-randomised crossover trial in Australian school classrooms: low-NOx unflued gas heaters against non-indoor-emitting flued gas heaters, NO2 and formaldehyde measured with passive diffusion badges, children recorded symptoms, medication use and lung function twice daily (class 3)
Effect: ratio 1.8 (1.6–2.1)
Caveat: ratio of concentrations, so the unit is a ratio; the trial randomised heater type by classroom

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.