Finding F-0224

“Comparing the proportion of PM2.5 to PM10 between the two measurement periods, it was found that the ratio of PM2.5 to PM10 during the winter measurement period was significantly higher than that during the spring measurement period, with values of 76.5% and 36.2%, respectively.”

Yu et al. Outdoor Radon and Its Progeny in Relation to the Particulate Matter during Different Polluted Weather in Beijing. Page 6. CKB 0461

Structure

Factor: Particulate matter (PM₂.₅ and PM₁₀)
Setting: city (ambient), CN (spring (dust storm weather))
Study design: outdoor measurement study in Beijing: radon and progeny (ERS-RDM-2S monitor), PM2.5, PM10 and meteorology recorded during a spring dust-storm period and a winter haze period (class 4)
Effect: ratio 36.2
Averaging time: measurement-period mean

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.