Finding F-0253

“Calibration coefficients for both sensor types trended downwards over time to < 1 at final calibration timepoint [Airbeam 1 Mean (SD) = 0.87 (0.20); Airbeam 2 Mean (SD) = 0.96 (0.27)].”

Anastasiou Feasibility of low-cost particle sensor types in long-term indoor air pollution health studies after repeated calibration, 2019–2021 (2022). Scientific reports. Page 1. CKB 8709

Structure

Source: Tobacco smoke (secondhand smoke)
Factor: Particulate matter (PM₂.₅ and PM₁₀)
Method: Low-cost sensors
Study design: longitudinal performance study of 51 low-cost particle sensors (Airbeam 1 and Airbeam 2) calibrated four times over two years (2019-2021) against a Thermo Scientific PDR-1500 with cigarette smoke (class 4)
Effect: other 0.96
Caveat: coefficients relative to the reference instrument, printed as < 1

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.