Finding F-1475

“While CR Boxes were deployed, concentrations of seven PFAS (N-EtFOSE, N-EtFOSA, FBSA, PFBS, PFHxS, PFOS, PFNA) were 28−61% lower and concentrations of five phthalates (DMP, DEP, DiBP, BBzP, DCHP) were 29−62% lower.”

Does Using Corsi−Rosenthal Boxes to Mitigate COVID-19 Transmission Also Reduce Indoor Air Concentrations of PFAS and Phthalates? (2023). Environmental science & technology. Page 1. CKB 8957

Structure

Factor: Phthalates
Intervention: Air filtration and air purifiers
Setting: office, US
Study design: before-and-after study in an occupied office building in Providence, Rhode Island: semi-volatile organic compounds and per- and polyfluoroalkyl substances measured in 17 rooms before and during the deployment of Corsi-Rosenthal boxes, with sound levels measured with the boxes running and off (class 3)
Effect: difference 62
Caveat: a before-and-after comparison across two seasons, so a seasonal change cannot be ruled out; the study also finds five of those substances and one phthalate rising by 23 to 44 %

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.