Finding F-1668

“The particle filters reduced the median concentration of PM2.5 from approximately 8 to 4 μg/m3 and the particle number concentration from 7669 to 5352 particles/cm3.”

An indoor air filtration study in homes of elderly: cardiovascular and respiratory effects of exposure to particulate matter (2013). Environmental health : a global access science source. Page 1. CKB 6871

Structure

Factor: Ultrafine particles (UFP)
Intervention: Air filtration and air purifiers
Setting: home
Study design: crossover filtration study in the homes of elderly subjects: custom-built particle filter units run in the living room and the bedroom, with fine particles and particle number measured and cardiovascular and lung outcomes recorded before and during each exposure scenario (class 2)
Effect: median
Caveat: a particle number concentration, so it is dominated by the smallest particles; the study found no statistically significant effect on the health markers

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.