The pan coefficient (\(K_p\)) is used to convert evaporation measured from a pan to the equivalent evaporation over a larger water body. For the United States Weather Bureau Class A pan, the average pan coefficient is approximately 0.70, accounting for the differences in heat storage and energy exchange between the pan and a natural water body.
A particle dispersoid has 1510 spherical particles of uniform density. An air purifier is proposed to be used to remove these particles. The diameter-specific number of particles in the dispersoid, along with the number removal efficiency of the proposed purifier is shown in the following table:
The overall mass removal efficiency of the proposed purifier is ________% (rounded off to one decimal place).