PM2.5 has widely been considered to be an air pollution that threatens the health of the generalpopulation.Any attempts to mitigate PM2.5 would be largely futile without surveillance measurement designedto detect the concentration of PM2.5 particles suspended in the atmosphere.It details the design andconstruction of a device to measure the concentration of PM2.5 particles based on laser-induced Miescattering,and we have conducted experiments to evaluate the accuracy of our system's measurement datausing open-source development platform.