Finding F-1259

“When higher lamp intensity was applied, a small but measurable increase in ozone levels was detected, with concentrations rising by up to 10 ppb above background.”

McNeill Effects of germicidal far-UVC on ozone and particulate matter in a conference room… (2025). PLoS One. Page 4. CKB 1095

Structure

Factor: Ozone (O₃)
Setting: conference room, US
Study design: field experiment in a closed conference room of an office suite in New York: far-UVC lamps at 222 nanometres were run at single-lamp and at higher intensity while ozone, particle number and particle size were measured continuously in the room and in the adjacent open lounge over experiments lasting up to ten daytime hours (class 3)
Effect: difference 10
Caveat: the sentence prints the increase as an upper bound

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.